High 7.8Published Sep 11, 2026

CVE-2026-89548SUNRPC: always drain cache_cleaner before destroying a cache_detail

Updated under an hour ago (Oct 27, 2026, 2:23 PM ET)

Does this affect you?

It affects Linux. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 820f9442e711a81749e70c40f149fc54c4ce0ca8 before dec787a15c96a5665e9ffc61b429a6a4ab26e6b9; 820f9442e711a81749e70c40f149fc54c4ce0ca8 builds before 5eea874a696201c31e7c2d7badbfa0d90e9961b5; from 820f9442e711a81749e70c40f149fc54c4ce0ca8 before cf239de7fdcc8336259b01ea4bcf650dadad1040; 820f9442e711a81749e70c40f149fc54c4ce0ca8 builds before 6d74ecc2be120a0c300b224b7649fe93c0453714; 820f9442e711a81749e70c40f149fc54c4ce0ca8 builds before 9d44836f60c8c29bcdb1471fd9202387c642a890; 820f9442e711a81749e70c40f149fc54c4ce0ca8 builds before 2e861ce2aaa468351a6a47c4cbb4971ebb740c7b; 820f9442e711a81749e70c40f149fc54c4ce0ca8 builds before 3d60fdf951143d6ef4e352e2f8eb852286701726; from 820f9442e711a81749e70c40f149fc54c4ce0ca8 before f42d0fda0c67695db6bc704b04b7c10240805377	CNA record

References

References

https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9
https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5
https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040
https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714
https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890
https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b
https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726
https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.