CVE-2026-31400 - sunrpc: fix cache_request leak in cache_release

CVE-2026-31400 - sunrpc: fix cache_request leak in cache_release

https://cvefeed.io/rssfeed/latest.atom / Fri, 04/03/2026 - 21:10
CVE ID :CVE-2026-31400
Published : April 3, 2026, 4:16 p.m. | 2 hours, 50 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix cache_request leak in cache_release When a reader's file descriptor is closed while in the middle of reading a cache_request (rp->offset != 0), cache_release() decrements the request's readers count but never checks whether it should free the request. In cache_read(), when readers drops to 0 and CACHE_PENDING is clear, the cache_request is removed from the queue and freed along with its buffer and cache_head reference. cache_release() lacks this cleanup. The only other path that frees requests with readers == 0 is cache_dequeue(), but it runs only when CACHE_PENDING transitions from set to clear. If that transition already happened while readers was still non-zero, cache_dequeue() will have skipped the request, and no subsequent call will clean it up. Add the same cleanup logic from cache_read() to cache_release(): after decrementing readers, check if it reached 0 with CACHE_PENDING clear, and if so, dequeue and free the cache_request.
Severity: 0.0 | NA
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