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SUNRPC: always drain cache_cleaner before destroying a cache_detail

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-89548

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89548

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
        "lessThan": "dec787a15c96a5665e9ffc61b429a6a4ab26e6b9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
        "lessThan": "5eea874a696201c31e7c2d7badbfa0d90e9961b5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
        "lessThan": "cf239de7fdcc8336259b01ea4bcf650dadad1040",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
        "lessThan": "6d74ecc2be120a0c300b224b7649fe93c0453714",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
        "lessThan": "9d44836f60c8c29bcdb1471fd9202387c642a890",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
        "lessThan": "2e861ce2aaa468351a6a47c4cbb4971ebb740c7b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
        "lessThan": "3d60fdf951143d6ef4e352e2f8eb852286701726",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "820f9442e711a81749e70c40f149fc54c4ce0ca8",
        "lessThan": "f42d0fda0c67695db6bc704b04b7c10240805377",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sunrpc/cache.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sunrpc/cache.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89548

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35064 · Revision 1
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Publisher date
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