CVE-2026-89548High· 7.8▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 6.4
none → medium
— → 6.4
none → medium
— → 7.8
none → high
7.8 → 6.4
high → medium
6.4 → 7.8
medium → high
7.8 → 7
0.2% → 0.2%
7 → 7.8
Last analysed / modified upstream
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.
Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < dec787a15c96a5665e9ffc61b429a6a4ab26e6b9Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 5eea874a696201c31e7c2d7badbfa0d90e9961b5Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < cf239de7fdcc8336259b01ea4bcf650dadad1040Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 6d74ecc2be120a0c300b224b7649fe93c0453714Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 9d44836f60c8c29bcdb1471fd9202387c642a890Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 2e861ce2aaa468351a6a47c4cbb4971ebb740c7bLinux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 3d60fdf951143d6ef4e352e2f8eb852286701726Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < f42d0fda0c67695db6bc704b04b7c10240805377Linux 3.4Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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