SUNRPC: always drain cache_cleaner before destroying a cache_detail

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89548
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:38 UTC
Updated2026-10-19 09:17:49 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001260000 probability, percentile 0.020260000 (date 2026-10-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 dec787a15c96a5665e9ffc61b429a6a4ab26e6b9 git Not specified
CNA Linux Linux affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 5eea874a696201c31e7c2d7badbfa0d90e9961b5 git Not specified
CNA Linux Linux affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 cf239de7fdcc8336259b01ea4bcf650dadad1040 git Not specified
CNA Linux Linux affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 6d74ecc2be120a0c300b224b7649fe93c0453714 git Not specified
CNA Linux Linux affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 9d44836f60c8c29bcdb1471fd9202387c642a890 git Not specified
CNA Linux Linux affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 2e861ce2aaa468351a6a47c4cbb4971ebb740c7b git Not specified
CNA Linux Linux affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 3d60fdf951143d6ef4e352e2f8eb852286701726 git Not specified
CNA Linux Linux affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 f42d0fda0c67695db6bc704b04b7c10240805377 git Not specified
CNA Linux Linux affected 3.4 Not specified
CNA Linux Linux unaffected 3.4 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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