CVE-2026-89548 (GCVE-0-2026-89548)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-10-19 08:48
VLAI
Title
SUNRPC: always drain cache_cleaner before destroying a cache_detail
Summary
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: always drain cache_cleaner before destroying a cache_detail sunrpc_destroy_cache_detail() only cancels the global cache_cleaner delayed_work when cache_list is empty. During per-netns teardown cache_list is never empty because init_net's caches remain registered, so the cancel never fires. After unlink, the caller proceeds to cache_destroy_net() which kfrees the cache_detail while cache_clean() may still hold a dangling pointer to it. The result is a use-after-free: cache_dequeue() takes cd->queue_lock on freed memory, and cache_put() dereferences cd->cache_put as a function pointer from freed slab. Drop the list_empty guard so that cancel_delayed_work_sync() always runs, ensuring any in-flight cache_clean() completes before the cache_detail is freed. Re-arm the cleaner afterwards if other caches are still registered.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 19:23 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 820f9442e711a81749e70c40f149fc54c4ce0ca8 , < dec787a15c96a5665e9ffc61b429a6a4ab26e6b9 (git)
Affected: 820f9442e711a81749e70c40f149fc54c4ce0ca8 , < 5eea874a696201c31e7c2d7badbfa0d90e9961b5 (git)
Affected: 820f9442e711a81749e70c40f149fc54c4ce0ca8 , < cf239de7fdcc8336259b01ea4bcf650dadad1040 (git)
Affected: 820f9442e711a81749e70c40f149fc54c4ce0ca8 , < 6d74ecc2be120a0c300b224b7649fe93c0453714 (git)
Affected: 820f9442e711a81749e70c40f149fc54c4ce0ca8 , < 9d44836f60c8c29bcdb1471fd9202387c642a890 (git)
Affected: 820f9442e711a81749e70c40f149fc54c4ce0ca8 , < 2e861ce2aaa468351a6a47c4cbb4971ebb740c7b (git)
Affected: 820f9442e711a81749e70c40f149fc54c4ce0ca8 , < 3d60fdf951143d6ef4e352e2f8eb852286701726 (git)
Affected: 820f9442e711a81749e70c40f149fc54c4ce0ca8 , < f42d0fda0c67695db6bc704b04b7c10240805377 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.4
Unaffected: 0 , < 3.4 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-89548",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T19:23:39.938577Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-16T19:26:42.819Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/cache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dec787a15c96a5665e9ffc61b429a6a4ab26e6b9",
              "status": "affected",
              "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
              "versionType": "git"
            },
            {
              "lessThan": "5eea874a696201c31e7c2d7badbfa0d90e9961b5",
              "status": "affected",
              "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
              "versionType": "git"
            },
            {
              "lessThan": "cf239de7fdcc8336259b01ea4bcf650dadad1040",
              "status": "affected",
              "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
              "versionType": "git"
            },
            {
              "lessThan": "6d74ecc2be120a0c300b224b7649fe93c0453714",
              "status": "affected",
              "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
              "versionType": "git"
            },
            {
              "lessThan": "9d44836f60c8c29bcdb1471fd9202387c642a890",
              "status": "affected",
              "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
              "versionType": "git"
            },
            {
              "lessThan": "2e861ce2aaa468351a6a47c4cbb4971ebb740c7b",
              "status": "affected",
              "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
              "versionType": "git"
            },
            {
              "lessThan": "3d60fdf951143d6ef4e352e2f8eb852286701726",
              "status": "affected",
              "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
              "versionType": "git"
            },
            {
              "lessThan": "f42d0fda0c67695db6bc704b04b7c10240805377",
              "status": "affected",
              "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/cache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.4"
            },
            {
              "lessThan": "3.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: always drain cache_cleaner before destroying a cache_detail\n\nsunrpc_destroy_cache_detail() only cancels the global cache_cleaner\ndelayed_work when cache_list is empty.  During per-netns teardown\ncache_list is never empty because init_net\u0027s caches remain registered,\nso the cancel never fires.  After unlink, the caller proceeds to\ncache_destroy_net() which kfrees the cache_detail while cache_clean()\nmay still hold a dangling pointer to it.  The result is a\nuse-after-free: cache_dequeue() takes cd-\u003equeue_lock on freed memory,\nand cache_put() dereferences cd-\u003ecache_put as a function pointer from\nfreed slab.\n\nDrop the list_empty guard so that cancel_delayed_work_sync() always\nruns, ensuring any in-flight cache_clean() completes before the\ncache_detail is freed.  Re-arm the cleaner afterwards if other caches\nare still registered."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - sunrpc_destroy_cache_detail() runs from per-netns teardown (sunrpc_exit_net, nfsd_net_exit, gss_svc_shutdown_net) when a local task creates and destroys a network namespace; remote NFS/RPC traffic populates caches but never frees cache_detail.\nAC:L - The attacker controls both sides of the race: unshare of a user+net ns queues cache_cleaner at delay 0, writes expired entries via /proc/net/rpc/*/channel (ip_map_parse even calls cache_flush()), and drops the netns so destroy kfree()s cache_detail while cache_clean() still holds it.\nPR:L - Unprivileged users can create a user+network namespace (unshare -Urn). /proc/net/rpc cache files inherit userns-root ownership from proc_net_ns_init, so the attacker can populate and destroy those caches without init-namespace root.\nUI:N - The attacker creates the namespace, writes the cache channel, and tears the netns down from their own processes; no victim mount, file open, or other interaction is required.\nS:U - The use-after-free corrupts host kernel heap (struct cache_detail) within the same kernel security authority and is not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - cache_clean() calls cache_dequeue() and cache_put() on a kfree\u0027d cache_detail; per kernel UAF guidance, reclaim of that slab object yields an arbitrary kernel read primitive.\nI:H - cache_put() invokes cd-\u003ecache_put from the freed slab as a function pointer, and cache_dequeue() takes cd-\u003equeue_lock on freed memory, giving a control-flow hijack/write primitive.\nA:H - Use-after-free of cache_detail (spinlock on freed queue_lock and an indirect call through freed cache_put) causes a kernel oops or panic even when not fully exploited for code execution."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:48:41.057Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726"
        },
        {
          "url": "https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377"
        }
      ],
      "title": "SUNRPC: always drain cache_cleaner before destroying a cache_detail",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89548",
    "datePublished": "2026-09-11T19:44:23.298Z",
    "dateReserved": "2026-09-11T19:38:34.723Z",
    "dateUpdated": "2026-10-19T08:48:41.057Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89548",
      "date": "2026-10-27",
      "epss": "0.00126",
      "percentile": "0.02231"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-25T01:59:02.000Z",
      "cve": "CVE-2026-89548",
      "id": "msrc_CVE-2026-89548",
      "initial_release_date": "2026-09-13T01:04:52.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "SUNRPC: always drain cache_cleaner before destroying a cache_detail",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89548.json",
      "version": "5"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/sunrpc/cache.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "dec787a15c96a5665e9ffc61b429a6a4ab26e6b9",
                    "status": "affected",
                    "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "5eea874a696201c31e7c2d7badbfa0d90e9961b5",
                    "status": "affected",
                    "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "cf239de7fdcc8336259b01ea4bcf650dadad1040",
                    "status": "affected",
                    "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "6d74ecc2be120a0c300b224b7649fe93c0453714",
                    "status": "affected",
                    "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "9d44836f60c8c29bcdb1471fd9202387c642a890",
                    "status": "affected",
                    "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "2e861ce2aaa468351a6a47c4cbb4971ebb740c7b",
                    "status": "affected",
                    "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "3d60fdf951143d6ef4e352e2f8eb852286701726",
                    "status": "affected",
                    "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "f42d0fda0c67695db6bc704b04b7c10240805377",
                    "status": "affected",
                    "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/sunrpc/cache.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "3.4"
                  },
                  {
                    "lessThan": "3.4",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.270",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.221",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.188",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.157",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.109",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.50",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.4",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "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\nSUNRPC: always drain cache_cleaner before destroying a cache_detail\n\nsunrpc_destroy_cache_detail() only cancels the global cache_cleaner\ndelayed_work when cache_list is empty.  During per-netns teardown\ncache_list is never empty because init_net\u0027s caches remain registered,\nso the cancel never fires.  After unlink, the caller proceeds to\ncache_destroy_net() which kfrees the cache_detail while cache_clean()\nmay still hold a dangling pointer to it.  The result is a\nuse-after-free: cache_dequeue() takes cd-\u003equeue_lock on freed memory,\nand cache_put() dereferences cd-\u003ecache_put as a function pointer from\nfreed slab.\n\nDrop the list_empty guard so that cancel_delayed_work_sync() always\nruns, ensuring any in-flight cache_clean() completes before the\ncache_detail is freed.  Re-arm the cleaner afterwards if other caches\nare still registered."
          }
        ],
        "id": "CVE-2026-89548",
        "lastModified": "2026-10-19T09:17:49.957",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-89548",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T19:23:39.938577Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-09-11T20:19:38.250",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-29T14:17:35+00:00",
      "cve": "CVE-2026-89548",
      "id": "CVE-2026-89548",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: SUNRPC: always drain cache_cleaner before destroying a cache_detail",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89548.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T01:08:37Z",
      "cve": "CVE-2026-89548",
      "id": "CVE-2026-89548",
      "initial_release_date": "2026-09-12T16:26:13Z",
      "product_status:known_affected": "769",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "212",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89548",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-89548.json",
      "version": "11"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-89548",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T19:23:39.938577Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T19:23:41.107Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/sunrpc/cache.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "dec787a15c96a5665e9ffc61b429a6a4ab26e6b9",
                  "status": "affected",
                  "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                  "versionType": "git"
                },
                {
                  "lessThan": "5eea874a696201c31e7c2d7badbfa0d90e9961b5",
                  "status": "affected",
                  "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                  "versionType": "git"
                },
                {
                  "lessThan": "cf239de7fdcc8336259b01ea4bcf650dadad1040",
                  "status": "affected",
                  "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                  "versionType": "git"
                },
                {
                  "lessThan": "6d74ecc2be120a0c300b224b7649fe93c0453714",
                  "status": "affected",
                  "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                  "versionType": "git"
                },
                {
                  "lessThan": "9d44836f60c8c29bcdb1471fd9202387c642a890",
                  "status": "affected",
                  "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                  "versionType": "git"
                },
                {
                  "lessThan": "2e861ce2aaa468351a6a47c4cbb4971ebb740c7b",
                  "status": "affected",
                  "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                  "versionType": "git"
                },
                {
                  "lessThan": "3d60fdf951143d6ef4e352e2f8eb852286701726",
                  "status": "affected",
                  "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                  "versionType": "git"
                },
                {
                  "lessThan": "f42d0fda0c67695db6bc704b04b7c10240805377",
                  "status": "affected",
                  "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/sunrpc/cache.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "3.4"
                },
                {
                  "lessThan": "3.4",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.270",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.221",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.188",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.157",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.109",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.50",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.2.*",
                  "status": "unaffected",
                  "version": "7.2.4",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.3",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.270",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.221",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.188",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.157",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.109",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.50",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.2.4",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.3",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: always drain cache_cleaner before destroying a cache_detail\n\nsunrpc_destroy_cache_detail() only cancels the global cache_cleaner\ndelayed_work when cache_list is empty.  During per-netns teardown\ncache_list is never empty because init_net\u0027s caches remain registered,\nso the cancel never fires.  After unlink, the caller proceeds to\ncache_destroy_net() which kfrees the cache_detail while cache_clean()\nmay still hold a dangling pointer to it.  The result is a\nuse-after-free: cache_dequeue() takes cd-\u003equeue_lock on freed memory,\nand cache_put() dereferences cd-\u003ecache_put as a function pointer from\nfreed slab.\n\nDrop the list_empty guard so that cancel_delayed_work_sync() always\nruns, ensuring any in-flight cache_clean() completes before the\ncache_detail is freed.  Re-arm the cleaner afterwards if other caches\nare still registered."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - sunrpc_destroy_cache_detail() runs from per-netns teardown (sunrpc_exit_net, nfsd_net_exit, gss_svc_shutdown_net) when a local task creates and destroys a network namespace; remote NFS/RPC traffic populates caches but never frees cache_detail.\nAC:L - The attacker controls both sides of the race: unshare of a user+net ns queues cache_cleaner at delay 0, writes expired entries via /proc/net/rpc/*/channel (ip_map_parse even calls cache_flush()), and drops the netns so destroy kfree()s cache_detail while cache_clean() still holds it.\nPR:L - Unprivileged users can create a user+network namespace (unshare -Urn). /proc/net/rpc cache files inherit userns-root ownership from proc_net_ns_init, so the attacker can populate and destroy those caches without init-namespace root.\nUI:N - The attacker creates the namespace, writes the cache channel, and tears the netns down from their own processes; no victim mount, file open, or other interaction is required.\nS:U - The use-after-free corrupts host kernel heap (struct cache_detail) within the same kernel security authority and is not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - cache_clean() calls cache_dequeue() and cache_put() on a kfree\u0027d cache_detail; per kernel UAF guidance, reclaim of that slab object yields an arbitrary kernel read primitive.\nI:H - cache_put() invokes cd-\u003ecache_put from the freed slab as a function pointer, and cache_dequeue() takes cd-\u003equeue_lock on freed memory, giving a control-flow hijack/write primitive.\nA:H - Use-after-free of cache_detail (spinlock on freed queue_lock and an indirect call through freed cache_put) causes a kernel oops or panic even when not fully exploited for code execution."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-19T08:48:41.057Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9"
            },
            {
              "url": "https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5"
            },
            {
              "url": "https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040"
            },
            {
              "url": "https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714"
            },
            {
              "url": "https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890"
            },
            {
              "url": "https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b"
            },
            {
              "url": "https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726"
            },
            {
              "url": "https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377"
            }
          ],
          "title": "SUNRPC: always drain cache_cleaner before destroying a cache_detail",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-89548",
        "datePublished": "2026-09-11T19:44:23.298Z",
        "dateReserved": "2026-09-11T19:38:34.723Z",
        "dateUpdated": "2026-10-19T08:48:41.057Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.