CVE-2026-89548
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, sunrpc_destroy_cache_detail() only cancels the global cache_cleaner delayed_work when cache_list is empty, which never happens during per-netns teardown. This leads to a use-after-free where cache_clean() may still hold a dangling pointer to the freed cache_detail.
Risk Assessment
This can lead to use-after-free, potentially enabling privilege escalation or kernel crash. However, it requires local access to network operations within namespaces.
Recommendation
Update the Linux kernel to a version containing the fix that always calls cancel_delayed_work_sync() before freeing the cache_detail. Check systems using NFS/SUNRPC in containers or network namespaces.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS