Vulnerability-Lookup

CVE-2026-63808 (GCVE-0-2026-63808)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-08-17 04:51

Title

exfat: fix potential use-after-free in exfat_find_dir_entry()

Summary

In the Linux kernel, the following vulnerability has been resolved: exfat: fix potential use-after-free in exfat_find_dir_entry() In exfat_find_dir_entry(), the buffer_head obtained from exfat_get_dentry() is released with brelse(bh) before the fall-through TYPE_EXTEND branch reads the directory entry through ep (which points into bh->b_data): brelse(bh); if (entry_type == TYPE_EXTEND) { ... len = exfat_extract_uni_name(ep, entry_uniname); ... } After brelse() drops our reference, nothing guarantees that the underlying page backing bh->b_data remains valid for the subsequent exfat_extract_uni_name() read. This is the same pattern fixed in commit fc961522ddbd ("exfat: Fix potential use after free in exfat_load_upcase_table()"). Move brelse(bh) so it runs after ep is no longer dereferenced on each branch. Confirmed on QEMU x86_64 with CONFIG_KASAN=y + CONFIG_DEBUG_PAGEALLOC=y + CONFIG_PAGE_POISONING=y on linux-next, using a crafted exFAT image (long filename with same-hash collisions forcing the TYPE_EXTEND path). With a debug-only invalidate_bdev() inserted between brelse(bh) and the ep read to make the stale-deref window deterministic, the unpatched kernel faults: BUG: KASAN: use-after-free in exfat_find_dir_entry+0x133b/0x15a0 BUG: unable to handle page fault for address: ffff88801a5fa0c2 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI RIP: 0010:exfat_find_dir_entry+0x1188/0x15a0 With this patch applied, the same instrumented harness completes cleanly under the same sanitizer stack. I have not reproduced a crash on an uninstrumented kernel under ordinary reclaim; the instrumented A/B establishes the lifetime violation and that the patch closes it, not an unaided triggerability claim.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/e6f1a11cfb808441a…
https://git.kernel.org/stable/c/e48f413c2815787b8…
https://git.kernel.org/stable/c/06c4e1e9967d332ac…
https://git.kernel.org/stable/c/8e0abc17fbd7e3058…
https://git.kernel.org/stable/c/4d101016d5e587f82…
https://git.kernel.org/stable/c/adfacfbaeae2cb760…
https://git.kernel.org/stable/c/708b97e792945d3e4…
https://git.kernel.org/stable/c/3f5f8ee9917cc2b90…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < e6f1a11cfb808441a43ffae9b476cc135732cd27 (git) Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < e48f413c2815787b8cade2795e194e3c4cd782ef (git) Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 06c4e1e9967d332ac33ba38b7819851089ff9359 (git) Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 8e0abc17fbd7e305802e84fe98b4950d50f9c433 (git) Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 4d101016d5e587f820b3ae2d5bb6770d86342649 (git) Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < adfacfbaeae2cb760f492357cc36b41f84ef7f86 (git) Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 708b97e792945d3e4653939fd3405d71a61ad065 (git) Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 3f5f8ee9917cc2b9076ac533492d8a200edcabb8 (git)	guessed
Linux	Linux	Affected: 5.7 Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.260 , ≤ 5.10.* (semver) Unaffected: 5.15.211 , ≤ 5.15.* (semver) Unaffected: 6.1.177 , ≤ 6.1.* (semver) Unaffected: 6.6.144 , ≤ 6.6.* (semver) Unaffected: 6.12.95 , ≤ 6.12.* (semver) Unaffected: 6.18.38 , ≤ 6.18.* (semver) Unaffected: 7.1.3 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/exfat/dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e6f1a11cfb808441a43ffae9b476cc135732cd27",
              "status": "affected",
              "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
              "versionType": "git"
            },
            {
              "lessThan": "e48f413c2815787b8cade2795e194e3c4cd782ef",
              "status": "affected",
              "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
              "versionType": "git"
            },
            {
              "lessThan": "06c4e1e9967d332ac33ba38b7819851089ff9359",
              "status": "affected",
              "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
              "versionType": "git"
            },
            {
              "lessThan": "8e0abc17fbd7e305802e84fe98b4950d50f9c433",
              "status": "affected",
              "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
              "versionType": "git"
            },
            {
              "lessThan": "4d101016d5e587f820b3ae2d5bb6770d86342649",
              "status": "affected",
              "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
              "versionType": "git"
            },
            {
              "lessThan": "adfacfbaeae2cb760f492357cc36b41f84ef7f86",
              "status": "affected",
              "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
              "versionType": "git"
            },
            {
              "lessThan": "708b97e792945d3e4653939fd3405d71a61ad065",
              "status": "affected",
              "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
              "versionType": "git"
            },
            {
              "lessThan": "3f5f8ee9917cc2b9076ac533492d8a200edcabb8",
              "status": "affected",
              "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/exfat/dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.260",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.211",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.177",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.260",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.211",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.177",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.144",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.95",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.38",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: fix potential use-after-free in exfat_find_dir_entry()\n\nIn exfat_find_dir_entry(), the buffer_head obtained from\nexfat_get_dentry() is released with brelse(bh) before the fall-through\nTYPE_EXTEND branch reads the directory entry through ep (which points\ninto bh-\u003eb_data):\n\n\tbrelse(bh);\n\tif (entry_type == TYPE_EXTEND) {\n\t\t...\n\t\tlen = exfat_extract_uni_name(ep, entry_uniname);\n\t\t...\n\t}\n\nAfter brelse() drops our reference, nothing guarantees that the\nunderlying page backing bh-\u003eb_data remains valid for the subsequent\nexfat_extract_uni_name() read. This is the same pattern fixed in\ncommit fc961522ddbd (\"exfat: Fix potential use after free in\nexfat_load_upcase_table()\").\n\nMove brelse(bh) so it runs after ep is no longer dereferenced on\neach branch.\n\nConfirmed on QEMU x86_64 with CONFIG_KASAN=y + CONFIG_DEBUG_PAGEALLOC=y\n+ CONFIG_PAGE_POISONING=y on linux-next, using a crafted exFAT image\n(long filename with same-hash collisions forcing the TYPE_EXTEND path).\nWith a debug-only invalidate_bdev() inserted between brelse(bh) and\nthe ep read to make the stale-deref window deterministic, the\nunpatched kernel faults:\n\n  BUG: KASAN: use-after-free in exfat_find_dir_entry+0x133b/0x15a0\n  BUG: unable to handle page fault for address: ffff88801a5fa0c2\n  Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\n  RIP: 0010:exfat_find_dir_entry+0x1188/0x15a0\n\nWith this patch applied, the same instrumented harness completes\ncleanly under the same sanitizer stack. I have not reproduced a\ncrash on an uninstrumented kernel under ordinary reclaim; the\ninstrumented A/B establishes the lifetime violation and that the\npatch closes it, not an unaided triggerability claim."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - exfat_find_dir_entry() is invoked during VFS directory lookups on mounted exFAT volumes, reachable remotely when that volume is exported via ksmbd or nfsd (common on NAS/router USB shares). A network client resolving paths on the share triggers server-side exfat_lookup without local shell access.\nAC:L - The attacker fully controls the crafted exFAT image to force the TYPE_EXTEND code path and can repeatedly trigger lookups (including concurrent SMB/NFS requests and memory pressure) to win the post-brelse buffer reclaim window. UAF lifetime violations are treated as low complexity per kernel guidance.\nPR:N - Exploitation requires only access to the mounted exFAT filesystem, not real root; guest/anonymous SMB shares on consumer NAS devices and auto-mounted removable media grant unprivileged attackers filesystem access without elevated kernel credentials.\nUI:N - Once a crafted exFAT image is present on a shared or auto-mounted volume, triggering the bug requires only automated path lookups (SMB OPEN/LOOKUP, openat, statx) with no additional victim interaction beyond normal filesystem access.\nS:U - Successful exploitation compromises kernel memory within the same security authority; this is a standard kernel memory corruption issue, not a cross-boundary escape such as VM guest-to-host breakout.\nC:H - The UAF reads freed buffer_head page cache memory through exfat_extract_uni_name(), enabling out-of-bounds kernel heap reads and information disclosure from attacker-influenced reclaimed data.\nI:H - Use-after-free on buffer_head data provides a foundation for heap grooming and arbitrary memory corruption primitives that can be leveraged for kernel code execution and integrity compromise.\nA:H - The bug is a confirmed kernel use-after-free that produced a KASAN fault and page fault oops; even without full exploitation it can cause kernel crashes and denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:51:14.402Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e6f1a11cfb808441a43ffae9b476cc135732cd27"
        },
        {
          "url": "https://git.kernel.org/stable/c/e48f413c2815787b8cade2795e194e3c4cd782ef"
        },
        {
          "url": "https://git.kernel.org/stable/c/06c4e1e9967d332ac33ba38b7819851089ff9359"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e0abc17fbd7e305802e84fe98b4950d50f9c433"
        },
        {
          "url": "https://git.kernel.org/stable/c/4d101016d5e587f820b3ae2d5bb6770d86342649"
        },
        {
          "url": "https://git.kernel.org/stable/c/adfacfbaeae2cb760f492357cc36b41f84ef7f86"
        },
        {
          "url": "https://git.kernel.org/stable/c/708b97e792945d3e4653939fd3405d71a61ad065"
        },
        {
          "url": "https://git.kernel.org/stable/c/3f5f8ee9917cc2b9076ac533492d8a200edcabb8"
        }
      ],
      "title": "exfat: fix potential use-after-free in exfat_find_dir_entry()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63808",
    "datePublished": "2026-07-19T12:02:11.323Z",
    "dateReserved": "2026-07-19T07:54:57.013Z",
    "dateUpdated": "2026-08-17T04:51:14.402Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63808",
      "date": "2026-09-23",
      "epss": "0.00527",
      "percentile": "0.43656"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-12T23:57:42.000Z",
      "cve": "CVE-2026-63808",
      "id": "msrc_CVE-2026-63808",
      "initial_release_date": "2026-07-20T01:08:28.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "exfat: fix potential use-after-free in exfat_find_dir_entry()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63808.json",
      "version": "3"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/exfat/dir.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "e6f1a11cfb808441a43ffae9b476cc135732cd27",
                    "status": "affected",
                    "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e48f413c2815787b8cade2795e194e3c4cd782ef",
                    "status": "affected",
                    "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "06c4e1e9967d332ac33ba38b7819851089ff9359",
                    "status": "affected",
                    "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "8e0abc17fbd7e305802e84fe98b4950d50f9c433",
                    "status": "affected",
                    "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "4d101016d5e587f820b3ae2d5bb6770d86342649",
                    "status": "affected",
                    "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "adfacfbaeae2cb760f492357cc36b41f84ef7f86",
                    "status": "affected",
                    "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "708b97e792945d3e4653939fd3405d71a61ad065",
                    "status": "affected",
                    "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "3f5f8ee9917cc2b9076ac533492d8a200edcabb8",
                    "status": "affected",
                    "version": "ca06197382bde0a3bc20215595d1c9ce20c6e341",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/exfat/dir.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.7"
                  },
                  {
                    "lessThan": "5.7",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.260",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.211",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.177",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.144",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.95",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.38",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.1.*",
                    "status": "unaffected",
                    "version": "7.1.3",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.2",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: fix potential use-after-free in exfat_find_dir_entry()\n\nIn exfat_find_dir_entry(), the buffer_head obtained from\nexfat_get_dentry() is released with brelse(bh) before the fall-through\nTYPE_EXTEND branch reads the directory entry through ep (which points\ninto bh-\u003eb_data):\n\n\tbrelse(bh);\n\tif (entry_type == TYPE_EXTEND) {\n\t\t...\n\t\tlen = exfat_extract_uni_name(ep, entry_uniname);\n\t\t...\n\t}\n\nAfter brelse() drops our reference, nothing guarantees that the\nunderlying page backing bh-\u003eb_data remains valid for the subsequent\nexfat_extract_uni_name() read. This is the same pattern fixed in\ncommit fc961522ddbd (\"exfat: Fix potential use after free in\nexfat_load_upcase_table()\").\n\nMove brelse(bh) so it runs after ep is no longer dereferenced on\neach branch.\n\nConfirmed on QEMU x86_64 with CONFIG_KASAN=y + CONFIG_DEBUG_PAGEALLOC=y\n+ CONFIG_PAGE_POISONING=y on linux-next, using a crafted exFAT image\n(long filename with same-hash collisions forcing the TYPE_EXTEND path).\nWith a debug-only invalidate_bdev() inserted between brelse(bh) and\nthe ep read to make the stale-deref window deterministic, the\nunpatched kernel faults:\n\n  BUG: KASAN: use-after-free in exfat_find_dir_entry+0x133b/0x15a0\n  BUG: unable to handle page fault for address: ffff88801a5fa0c2\n  Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\n  RIP: 0010:exfat_find_dir_entry+0x1188/0x15a0\n\nWith this patch applied, the same instrumented harness completes\ncleanly under the same sanitizer stack. I have not reproduced a\ncrash on an uninstrumented kernel under ordinary reclaim; the\ninstrumented A/B establishes the lifetime violation and that the\npatch closes it, not an unaided triggerability claim."
          }
        ],
        "id": "CVE-2026-63808",
        "lastModified": "2026-08-17T05:17:17.753",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-07-19T12:16:53.620",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/06c4e1e9967d332ac33ba38b7819851089ff9359"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3f5f8ee9917cc2b9076ac533492d8a200edcabb8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4d101016d5e587f820b3ae2d5bb6770d86342649"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/708b97e792945d3e4653939fd3405d71a61ad065"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8e0abc17fbd7e305802e84fe98b4950d50f9c433"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/adfacfbaeae2cb760f492357cc36b41f84ef7f86"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e48f413c2815787b8cade2795e194e3c4cd782ef"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e6f1a11cfb808441a43ffae9b476cc135732cd27"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-04T08:01:32+00:00",
      "cve": "CVE-2026-63808",
      "id": "CVE-2026-63808",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: exfat: fix potential use-after-free in exfat_find_dir_entry()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63808.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:48:06Z",
      "cve": "CVE-2026-63808",
      "id": "CVE-2026-63808",
      "initial_release_date": "2026-07-19T17:34:57Z",
      "product_status:known_affected": "624",
      "product_status:known_not_affected": "97",
      "product_status:recommended": "194",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63808",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63808.json",
      "version": "14"
    }
  }
}

GHSA-RP7P-3V5M-F8GG

Vulnerability from github – Published: 2026-07-19 12:30 – Updated: 2026-07-20 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

exfat: fix potential use-after-free in exfat_find_dir_entry()

In exfat_find_dir_entry(), the buffer_head obtained from exfat_get_dentry() is released with brelse(bh) before the fall-through TYPE_EXTEND branch reads the directory entry through ep (which points into bh->b_data):

brelse(bh);
if (entry_type == TYPE_EXTEND) {
    ...
    len = exfat_extract_uni_name(ep, entry_uniname);
    ...
}

After brelse() drops our reference, nothing guarantees that the underlying page backing bh->b_data remains valid for the subsequent exfat_extract_uni_name() read. This is the same pattern fixed in commit fc961522ddbd ("exfat: Fix potential use after free in exfat_load_upcase_table()").

Move brelse(bh) so it runs after ep is no longer dereferenced on each branch.

Confirmed on QEMU x86_64 with CONFIG_KASAN=y + CONFIG_DEBUG_PAGEALLOC=y + CONFIG_PAGE_POISONING=y on linux-next, using a crafted exFAT image (long filename with same-hash collisions forcing the TYPE_EXTEND path). With a debug-only invalidate_bdev() inserted between brelse(bh) and the ep read to make the stale-deref window deterministic, the unpatched kernel faults:

BUG: KASAN: use-after-free in exfat_find_dir_entry+0x133b/0x15a0 BUG: unable to handle page fault for address: ffff88801a5fa0c2 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI RIP: 0010:exfat_find_dir_entry+0x1188/0x15a0

With this patch applied, the same instrumented harness completes cleanly under the same sanitizer stack. I have not reproduced a crash on an uninstrumented kernel under ordinary reclaim; the instrumented A/B establishes the lifetime violation and that the patch closes it, not an unaided triggerability claim.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-63808"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T12:16:53Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: fix potential use-after-free in exfat_find_dir_entry()\n\nIn exfat_find_dir_entry(), the buffer_head obtained from\nexfat_get_dentry() is released with brelse(bh) before the fall-through\nTYPE_EXTEND branch reads the directory entry through ep (which points\ninto bh-\u003eb_data):\n\n\tbrelse(bh);\n\tif (entry_type == TYPE_EXTEND) {\n\t\t...\n\t\tlen = exfat_extract_uni_name(ep, entry_uniname);\n\t\t...\n\t}\n\nAfter brelse() drops our reference, nothing guarantees that the\nunderlying page backing bh-\u003eb_data remains valid for the subsequent\nexfat_extract_uni_name() read. This is the same pattern fixed in\ncommit fc961522ddbd (\"exfat: Fix potential use after free in\nexfat_load_upcase_table()\").\n\nMove brelse(bh) so it runs after ep is no longer dereferenced on\neach branch.\n\nConfirmed on QEMU x86_64 with CONFIG_KASAN=y + CONFIG_DEBUG_PAGEALLOC=y\n+ CONFIG_PAGE_POISONING=y on linux-next, using a crafted exFAT image\n(long filename with same-hash collisions forcing the TYPE_EXTEND path).\nWith a debug-only invalidate_bdev() inserted between brelse(bh) and\nthe ep read to make the stale-deref window deterministic, the\nunpatched kernel faults:\n\n  BUG: KASAN: use-after-free in exfat_find_dir_entry+0x133b/0x15a0\n  BUG: unable to handle page fault for address: ffff88801a5fa0c2\n  Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\n  RIP: 0010:exfat_find_dir_entry+0x1188/0x15a0\n\nWith this patch applied, the same instrumented harness completes\ncleanly under the same sanitizer stack. I have not reproduced a\ncrash on an uninstrumented kernel under ordinary reclaim; the\ninstrumented A/B establishes the lifetime violation and that the\npatch closes it, not an unaided triggerability claim.",
  "id": "GHSA-rp7p-3v5m-f8gg",
  "modified": "2026-07-20T15:31:47Z",
  "published": "2026-07-19T12:30:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63808"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06c4e1e9967d332ac33ba38b7819851089ff9359"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f5f8ee9917cc2b9076ac533492d8a200edcabb8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d101016d5e587f820b3ae2d5bb6770d86342649"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/708b97e792945d3e4653939fd3405d71a61ad065"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e0abc17fbd7e305802e84fe98b4950d50f9c433"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/adfacfbaeae2cb760f492357cc36b41f84ef7f86"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e48f413c2815787b8cade2795e194e3c4cd782ef"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6f1a11cfb808441a43ffae9b476cc135732cd27"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-63808

Vulnerability from csaf_microsoft - Published: 2026-07-20 01:08 - Updated: 2026-07-20 14:47

Summary

exfat: fix potential use-after-free in exfat_find_dir_entry()

Scope

1 vulnerability in this advisory, including CVE-2026-63808.

CVE-2026-63808

Known affected: 1 product

Open the full advisory

OPENSUSE-SU-2026:11339-1

Vulnerability from csaf_opensuse - Published: 2026-07-22 00:00 - Updated: 2026-09-23 08:32

Summary

kernel-devel-7.1.4-1.1 on GA media

Severity

Moderate

Scope

68 vulnerabilities in this advisory, including CVE-2026-63808.

CVE-2026-63808

5.7 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Recommended: 16 products

Open the full advisory

RHSA-2026:63128

Vulnerability from csaf_opensuse - Published: 2026-09-04 02:28 - Updated: 2026-09-22 06:18

Summary

Red Hat Security Advisory: kernel security update

Severity

Important

Scope

6 vulnerabilities in this advisory, including CVE-2026-63808.

CVE-2026-63808

A flaw was found in the Linux kernel's exFAT filesystem driver. A local attacker could exploit a use-after-free vulnerability in the `exfat_find_dir_entry()` function. This occurs because a buffer is prematurely released while still being referenced, which can be triggered by processing a specially crafted exFAT image. Successful exploitation leads to a system crash, resulting in a Denial of Service (DoS).

7.0 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Fixed: 309 products

https://access.redhat.com/errata/RHSA-2026:63128

Open the full advisory

RHSA-2026:63129

Vulnerability from csaf_opensuse - Published: 2026-09-04 02:32 - Updated: 2026-09-23 03:34

Summary

Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Severity

Important

Scope

27 vulnerabilities in this advisory, including CVE-2026-63808.

CVE-2026-63808

7.0 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Fixed: 303 products

https://access.redhat.com/errata/RHSA-2026:63129

Open the full advisory

RLSA-2026:63128 (CVE-2026-53073)

Vulnerability from osv_rocky – Published: 2026-09-05 18:09 – Updated: 2026-09-19 18:13 – Source website

Summary

Important: kernel security update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error (CVE-2026-53073)
kernel: exfat: fix potential use-after-free in exfat_find_dir_entry() (CVE-2026-63808)
kernel: KEYS: fix overflow in keyctl_pkey_params_get_2() (CVE-2026-63824)
kernel: smb: client: fix query directory replay double-free (CVE-2026-64387)
kernel: iomap: fix out-of-bounds bitmap_set() with zero-length range (CVE-2026-68145)
kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale res->rt6 pointer (CVE-2026-74581)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Severity

7.8 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Credits

Rocky Enterprise Software Foundation

Red Hat

References

URL

Type

	https://errata.rockylinux.org/RLSA-2026:63128	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2502248	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502235	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2513392	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2492447	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2520980	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2507046	REPORT
	https://access.redhat.com/errata/RHSA-2026:63128	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:10",
        "name": "kernel",
        "purl": "pkg:rpm/rocky-linux/kernel?distro=rocky-linux-10\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "BaseOS"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:6.12.0-211.51.1.el10_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "database_specific": {
    "license": "CC-BY-4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "source_advisory": "RHSA-2026:63128"
  },
  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error (CVE-2026-53073)\n\n* kernel: exfat: fix potential use-after-free in exfat_find_dir_entry() (CVE-2026-63808)\n\n* kernel: KEYS: fix overflow in keyctl_pkey_params_get_2() (CVE-2026-63824)\n\n* kernel: smb: client: fix query directory replay double-free (CVE-2026-64387)\n\n* kernel: iomap: fix out-of-bounds bitmap_set() with zero-length range (CVE-2026-68145)\n\n* kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale res-\u003ert6 pointer (CVE-2026-74581)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "RLSA-2026:63128",
  "modified": "2026-09-19T18:13:22.374626Z",
  "published": "2026-09-05T18:09:10.442815Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:63128"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502248"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502235"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513392"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492447"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520980"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507046"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:63128"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: kernel security update",
  "upstream": [
    "CVE-2026-53073",
    "CVE-2026-63808",
    "CVE-2026-63824",
    "CVE-2026-64387",
    "CVE-2026-68145",
    "CVE-2026-74581"
  ]
}

RLSA-2026:63129 (CVE-2025-40064)

Vulnerability from osv_rocky – Published: 2026-09-05 18:05 – Updated: 2026-09-19 18:13 – Source website

Summary

Important: kernel security, bug fix, and enhancement update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: smc: Fix use-after-free in __pnet_find_base_ndev() (CVE-2025-40064)
kernel: Linux kernel: Denial of Service due to memory leak in tpm2_load_cmd (CVE-2025-71147)
kernel: bonding: alb: fix UAF in rlb_arp_recv during bond up/down (CVE-2026-45970)
kernel: smb/client: fix out-of-bounds read in symlink_data() (CVE-2026-46185)
kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error (CVE-2026-53073)
kernel: pNFS: Fix use-after-free in pnfs_update_layout() (CVE-2026-63800)
kernel: nfsd: fix posix_acl leak on SETACL decode failure (CVE-2026-53397)
kernel: exfat: fix potential use-after-free in exfat_find_dir_entry() (CVE-2026-63808)
kernel: nfsd: release layout stid on setlease failure (CVE-2026-53399)
kernel: NFSv4/flexfiles: reject zero filehandle version count (CVE-2026-53392)
kernel: KEYS: fix overflow in keyctl_pkey_params_get_2() (CVE-2026-63824)
kernel: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr (CVE-2026-53391)
kernel: scsi: target: iscsi: Validate CHAP_R length before base64 decode (CVE-2026-63886)
kernel: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() (CVE-2026-64002)
kernel: net: mana: validate rx_req_idx to prevent out-of-bounds array access (CVE-2026-64018)
kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)
kernel: smb: client: fix query directory replay double-free (CVE-2026-64387)
kernel: Kernel: Remote out-of-bounds write in RDMA/siw (CVE-2026-64268)
kernel: crypto: qat - fix VF2PF work teardown race in adf_disable_sriov() (CVE-2026-64438)
kernel: crypto: qat - validate RSA CRT component lengths (CVE-2026-64304)
kernel: NFSv4: include MAY_WRITE in open permission mask for O_TRUNC (CVE-2026-64298)
kernel: ALSA: virtio: Validate control metadata from the device (CVE-2026-64490)
kernel: AMD-SN-7061: Safe RET Interrupt Vulnerability (CVE-2026-68480)
kernel: Linux kernel: Arbitrary code execution via userfaultfd shadow stack manipulation (CVE-2026-68166)
kernel: iomap: fix out-of-bounds bitmap_set() with zero-length range (CVE-2026-68145)
kernel: locking/rt: Fix the incorrect RCU protection in rt_spin_unlock() (CVE-2026-72069)
kernel: nvmet-auth: reject short AUTH_RECEIVE buffers (CVE-2026-72130)

Bug Fix(es) and Enhancement(s):

[Rocky Linux 9] TPM becomes completely unresponsive and requires a full reboot to clear [rhel-9.8.z] (JIRA:Rocky Linux-213940)
RT scheduler livelock caused by missing backport of 94894c9c477e [rhel-9.8.z] (JIRA:Rocky Linux-240634)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Severity

8.8 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Credits

Rocky Enterprise Software Foundation

Red Hat

References

URL

Type

	https://errata.rockylinux.org/RLSA-2026:63129	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2406747	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2432366	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2482006	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2482558	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2492447	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502219	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502227	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502235	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502239	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502240	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502248	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502260	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502329	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502363	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502421	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502447	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2507046	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2507089	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2507118	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2507119	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2507208	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2507277	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2508363	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2513167	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2513392	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2516248	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2516448	REPORT
	https://access.redhat.com/errata/RHSA-2026:63129	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:9",
        "name": "kernel",
        "purl": "pkg:rpm/rocky-linux/kernel?distro=rocky-linux-9\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "BaseOS"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:5.14.0-687.44.1.el9_8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "database_specific": {
    "license": "CC-BY-4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "source_advisory": "RHSA-2026:63129"
  },
  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: smc: Fix use-after-free in __pnet_find_base_ndev() (CVE-2025-40064)\n\n* kernel: Linux kernel: Denial of Service due to memory leak in tpm2_load_cmd (CVE-2025-71147)\n\n* kernel: bonding: alb: fix UAF in rlb_arp_recv during bond up/down (CVE-2026-45970)\n\n* kernel: smb/client: fix out-of-bounds read in symlink_data() (CVE-2026-46185)\n\n* kernel: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error (CVE-2026-53073)\n\n* kernel: pNFS: Fix use-after-free in pnfs_update_layout() (CVE-2026-63800)\n\n* kernel: nfsd: fix posix_acl leak on SETACL decode failure (CVE-2026-53397)\n\n* kernel: exfat: fix potential use-after-free in exfat_find_dir_entry() (CVE-2026-63808)\n\n* kernel: nfsd: release layout stid on setlease failure (CVE-2026-53399)\n\n* kernel: NFSv4/flexfiles: reject zero filehandle version count (CVE-2026-53392)\n\n* kernel: KEYS: fix overflow in keyctl_pkey_params_get_2() (CVE-2026-63824)\n\n* kernel: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr (CVE-2026-53391)\n\n* kernel: scsi: target: iscsi: Validate CHAP_R length before base64 decode (CVE-2026-63886)\n\n* kernel: ipv4: free net-\u003eipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() (CVE-2026-64002)\n\n* kernel: net: mana: validate rx_req_idx to prevent out-of-bounds array access (CVE-2026-64018)\n\n* kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)\n\n* kernel: smb: client: fix query directory replay double-free (CVE-2026-64387)\n\n* kernel: Kernel: Remote out-of-bounds write in RDMA/siw (CVE-2026-64268)\n\n* kernel: crypto: qat - fix VF2PF work teardown race in adf_disable_sriov() (CVE-2026-64438)\n\n* kernel: crypto: qat - validate RSA CRT component lengths (CVE-2026-64304)\n\n* kernel: NFSv4: include MAY_WRITE in open permission mask for O_TRUNC (CVE-2026-64298)\n\n* kernel: ALSA: virtio: Validate control metadata from the device (CVE-2026-64490)\n\n* kernel: AMD-SN-7061: Safe RET Interrupt Vulnerability (CVE-2026-68480)\n\n* kernel: Linux kernel: Arbitrary code execution via userfaultfd shadow stack manipulation (CVE-2026-68166)\n\n* kernel: iomap: fix out-of-bounds bitmap_set() with zero-length range (CVE-2026-68145)\n\n* kernel: locking/rt: Fix the incorrect RCU protection in rt_spin_unlock() (CVE-2026-72069)\n\n* kernel: nvmet-auth: reject short AUTH_RECEIVE buffers (CVE-2026-72130)\n\nBug Fix(es) and Enhancement(s):\n\n* [Rocky Linux 9] TPM becomes completely unresponsive and requires a full reboot to clear [rhel-9.8.z] (JIRA:Rocky Linux-213940)\n\n* RT scheduler livelock caused by missing backport of 94894c9c477e [rhel-9.8.z] (JIRA:Rocky Linux-240634)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "RLSA-2026:63129",
  "modified": "2026-09-19T18:13:17.426699Z",
  "published": "2026-09-05T18:05:10.481546Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:63129"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2406747"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2432366"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482006"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482558"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492447"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502219"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502227"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502235"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502239"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502240"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502248"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502260"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502329"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502363"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502421"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502447"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507046"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507089"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507118"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507119"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507208"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507277"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2508363"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513167"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513392"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516248"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516448"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:63129"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: kernel security, bug fix, and enhancement update",
  "upstream": [
    "CVE-2025-40064",
    "CVE-2025-71147",
    "CVE-2026-45970",
    "CVE-2026-46185",
    "CVE-2026-53073",
    "CVE-2026-53391",
    "CVE-2026-53392",
    "CVE-2026-53397",
    "CVE-2026-53399",
    "CVE-2026-63800",
    "CVE-2026-63808",
    "CVE-2026-63824",
    "CVE-2026-63886",
    "CVE-2026-63887",
    "CVE-2026-64002",
    "CVE-2026-64018",
    "CVE-2026-64268",
    "CVE-2026-64298",
    "CVE-2026-64304",
    "CVE-2026-64387",
    "CVE-2026-64438",
    "CVE-2026-64490",
    "CVE-2026-68145",
    "CVE-2026-68166",
    "CVE-2026-68480",
    "CVE-2026-72069",
    "CVE-2026-72130"
  ]
}

SUSE-SU-2026:23477-1

Vulnerability from csaf_suse - Published: 2026-09-08 12:54 - Updated: 2026-09-20 18:41

Summary

Security update for the Linux Kernel

Severity

Important

Scope

588 vulnerabilities in this advisory, including CVE-2026-63808.

CVE-2026-63808

5.7 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Recommended: 4 products

Open the full advisory

SUSE-SU-2026:23481-1

Vulnerability from csaf_suse - Published: 2026-09-08 13:00 - Updated: 2026-09-20 18:41

Summary

Security update for the Linux Kernel

Severity

Important

Scope

588 vulnerabilities in this advisory, including CVE-2026-63808.

CVE-2026-63808

5.7 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Recommended: 11 products

Open the full advisory

SUSE-SU-2026:23528-1

Vulnerability from csaf_suse - Published: 2026-09-08 10:34 - Updated: 2026-09-17 16:22

Summary

Security update for the Linux Kernel

Severity

Important

Scope

588 vulnerabilities in this advisory, including CVE-2026-63808.

CVE-2026-63808

5.7 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Recommended: 7 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-63808 (GCVE-0-2026-63808)

RLSA-2026:63128 (CVE-2026-53073)

RLSA-2026:63129 (CVE-2025-40064)

Tags

Sightings

Nomenclature

Related by attack behaviour