CVE-2026-63800 (GCVE-0-2026-63800)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-08-17 04:51
VLAI
Title
pNFS: Fix use-after-free in pnfs_update_layout()
Summary
In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free in pnfs_update_layout() When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds, pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(), which still references 'lo'. This results in a use-after-free when the tracepoint accesses lo's fields. Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 06f58dbc49a23c99e5c0f246879ed16667f7bf8f , < 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 9c0fb5c09ae5bd68dc0038692af8127029cb0385 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 2883ddd7542b4437a2ab4908fe2773f690e20889 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 200e7637f4d6a1342987045eea72641524f909dc (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 9645aaf689aff57427ece3b9fa47d5b5399417f4 (git)
Affected: 2c8d5fc37fe2384a9bdb6965443ab9224d46f704 , < 13e198a90ca4050f4bee8a3f23680389a6563ccc (git)
Affected: aa2399f55eff4ec78330bb6fe55f9df53e5cae0c (git)
Affected: 5.10.9 , < 5.10.260 (semver)
Affected: 5.4.91 , < 5.5 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (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 Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/pnfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98",
              "status": "affected",
              "version": "06f58dbc49a23c99e5c0f246879ed16667f7bf8f",
              "versionType": "git"
            },
            {
              "lessThan": "1f24b8302c77dcaf79c64c073877a3b9f4dd25d2",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "9c0fb5c09ae5bd68dc0038692af8127029cb0385",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "7e37e9b3e82ade881e1798e2f4fcc54aff7793c1",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "2883ddd7542b4437a2ab4908fe2773f690e20889",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "200e7637f4d6a1342987045eea72641524f909dc",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "9645aaf689aff57427ece3b9fa47d5b5399417f4",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "lessThan": "13e198a90ca4050f4bee8a3f23680389a6563ccc",
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aa2399f55eff4ec78330bb6fe55f9df53e5cae0c",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.260",
              "status": "affected",
              "version": "5.10.9",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.91",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/pnfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "lessThan": "5.11",
              "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": "5.10.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.211",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.177",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.144",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.95",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.38",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.91",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix use-after-free in pnfs_update_layout()\n\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references \u0027lo\u0027. This results in a use-after-free when the\ntracepoint accesses lo\u0027s fields.\n\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo)."
        }
      ],
      "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 - A compromised or malicious pNFS NFSv4.1+ metadata server can send CB_LAYOUTRECALL callbacks over the NFSv4 backchannel to force NFS_LAYOUT_RETURN while client file I/O reaches pnfs_update_layout(), exploiting the client from the network in typical enterprise/HPC pNFS deployments.\nAC:L - The attacker controls both sides of the race by issuing layout recalls from the server and driving or waiting for concurrent read/write I/O on the mounted pNFS share; no conditions beyond attacker influence are required once a pNFS session exists.\nPR:N - Exploitation requires no local privileges on the victim client\u2014a remote NFS server with an established pNFS session can trigger the layoutreturn/retry path while any client process performs permitted file I/O on the mount.\nUI:N - No interactive victim action is needed during exploitation; automated workloads, daemons, or batch jobs performing routine I/O on an existing pNFS mount are sufficient to hit the vulnerable code path.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain and does not cross a VM, container, or IOMMU boundary on its own.\nC:H - The tracepoint reads freed pnfs_layout_hdr fields (plh_stateid seqid and hash) after pnfs_put_layout_hdr() drops the final reference, giving an attacker-controlled use-after-free read primitive over kernel heap memory.\nI:H - Use-after-free on a refcounted kernel layout object enables heap grooming and further memory corruption for arbitrary kernel writes or control-flow hijacking, not merely a bounded fault.\nA:H - Dereferencing a freed pnfs_layout_hdr in kernel context can cause an oops or panic, and use-after-free corruption reliably threatens system availability even when full exploitation is not attempted."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:51:05.578Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889"
        },
        {
          "url": "https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc"
        }
      ],
      "title": "pNFS: Fix use-after-free in pnfs_update_layout()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63800",
    "datePublished": "2026-07-19T12:02:06.897Z",
    "dateReserved": "2026-07-19T07:54:57.013Z",
    "dateUpdated": "2026-08-17T04:51:05.578Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63800",
      "date": "2026-09-21",
      "epss": "0.00527",
      "percentile": "0.43446"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-14T17:51:51.000Z",
      "cve": "CVE-2026-63800",
      "id": "msrc_CVE-2026-63800",
      "initial_release_date": "2026-07-20T01:06:30.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "pNFS: Fix use-after-free in pnfs_update_layout()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63800.json",
      "version": "5"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/nfs/pnfs.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98",
                    "status": "affected",
                    "version": "06f58dbc49a23c99e5c0f246879ed16667f7bf8f",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "1f24b8302c77dcaf79c64c073877a3b9f4dd25d2",
                    "status": "affected",
                    "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "9c0fb5c09ae5bd68dc0038692af8127029cb0385",
                    "status": "affected",
                    "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "7e37e9b3e82ade881e1798e2f4fcc54aff7793c1",
                    "status": "affected",
                    "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "2883ddd7542b4437a2ab4908fe2773f690e20889",
                    "status": "affected",
                    "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "200e7637f4d6a1342987045eea72641524f909dc",
                    "status": "affected",
                    "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "9645aaf689aff57427ece3b9fa47d5b5399417f4",
                    "status": "affected",
                    "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "13e198a90ca4050f4bee8a3f23680389a6563ccc",
                    "status": "affected",
                    "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "aa2399f55eff4ec78330bb6fe55f9df53e5cae0c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "5.10.260",
                    "status": "affected",
                    "version": "5.10.9",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "5.5",
                    "status": "affected",
                    "version": "5.4.91",
                    "versionType": "semver"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/nfs/pnfs.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.11"
                  },
                  {
                    "lessThan": "5.11",
                    "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"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "1FDC12D0-2C56-4F4C-9EBF-45DCF5316E5D",
                    "versionEndExcluding": "5.5",
                    "versionStartIncluding": "5.4.91",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "7257F51A-BFB1-4EFF-8AB1-DEEF700EF3D5",
                    "versionEndExcluding": "5.10.260",
                    "versionStartIncluding": "5.10.9",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "655F31B9-4770-4EFA-8C26-7508934F4CDF",
                    "versionEndExcluding": "5.15.211",
                    "versionStartIncluding": "5.11.1",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "333C9E30-7FD4-46A2-94EF-C1AA1F3EE28B",
                    "versionEndExcluding": "6.1.177",
                    "versionStartIncluding": "5.16",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "C8AD3BC8-C843-423C-B9DB-CB52F67F578E",
                    "versionEndExcluding": "6.6.144",
                    "versionStartIncluding": "6.2",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "4E206B86-E0E3-4394-A93F-39F2D50A8AA8",
                    "versionEndExcluding": "6.12.95",
                    "versionStartIncluding": "6.7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "FA591B28-5D62-449E-BDBE-3C9391BF070A",
                    "versionEndExcluding": "6.18.38",
                    "versionStartIncluding": "6.13",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "9526B150-E2B3-4C6F-8AE5-1AF92B75AD9E",
                    "versionEndExcluding": "7.1.3",
                    "versionStartIncluding": "6.19",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:5.11:-:*:*:*:*:*:*",
                    "matchCriteriaId": "7AD3510E-E8FA-47F3-9AD5-D8EA4A2719D1",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*",
                    "matchCriteriaId": "A330B043-47EA-4D06-82BF-153A1735FC11",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc5:*:*:*:*:*:*",
                    "matchCriteriaId": "F0EE963C-B36C-4143-96A9-65BCA7D8F2EF",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc6:*:*:*:*:*:*",
                    "matchCriteriaId": "B511E2F6-2917-4797-8909-8F7EA4870C7B",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc7:*:*:*:*:*:*",
                    "matchCriteriaId": "E9FA9D80-C790-41EA-8A21-DF7B170465E0",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix use-after-free in pnfs_update_layout()\n\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references \u0027lo\u0027. This results in a use-after-free when the\ntracepoint accesses lo\u0027s fields.\n\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo)."
          }
        ],
        "id": "CVE-2026-63800",
        "lastModified": "2026-08-17T05:17:16.393",
        "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": "2026-07-19T12:16:52.553",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-04T08:03:40+00:00",
      "cve": "CVE-2026-63800",
      "id": "CVE-2026-63800",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "36",
      "product_status:known_not_affected": "29",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: pNFS: Fix use-after-free in pnfs_update_layout()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63800.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:59:12Z",
      "cve": "CVE-2026-63800",
      "id": "CVE-2026-63800",
      "initial_release_date": "2026-07-19T17:35:06Z",
      "product_status:known_affected": "277",
      "product_status:known_not_affected": "97",
      "product_status:recommended": "107",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63800",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63800.json",
      "version": "8"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.


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.