CVE-2026-89548SUNRPC: always drain cache_cleaner before destroying a cache_detail
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 98% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 – < dec787a15c96a5665e9ffc61b429a6a4ab26e6b9
- affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 – < 5eea874a696201c31e7c2d7badbfa0d90e9961b5
- affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 – < cf239de7fdcc8336259b01ea4bcf650dadad1040
- affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 – < 6d74ecc2be120a0c300b224b7649fe93c0453714
- affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 – < 9d44836f60c8c29bcdb1471fd9202387c642a890
- affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 – < 2e861ce2aaa468351a6a47c4cbb4971ebb740c7b
- affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 – < 3d60fdf951143d6ef4e352e2f8eb852286701726
- affected 820f9442e711a81749e70c40f149fc54c4ce0ca8 – < f42d0fda0c67695db6bc704b04b7c10240805377
- affected 3.4
- unaffected < 3.4
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9 (opens in a new tab)
- https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5 (opens in a new tab)
- https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040 (opens in a new tab)
- https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714 (opens in a new tab)
- https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890 (opens in a new tab)
- https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b (opens in a new tab)
- https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726 (opens in a new tab)
- https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76459 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-89548)Record last updated .