Linux kernel sunrpc cache_request leak
CVE-2026-31400 Published on April 3, 2026
sunrpc: fix cache_request leak in cache_release
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.
Products Associated with CVE-2026-31400
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 7bcd5e318876ac638c8ceade7a648e76ac8c48e1 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 41f6ba6c98a618043d2cd71030bf9a752dfab8b2 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 301670dcd098c1fe5c2fe90fb3c7a8f4814d2351 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below be5c35960e5ead70862736161836e2d1bc7352dc is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 373457de14281c1fc7cace6fc4c8a267fc176673 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 17ad31b3a43b72aec3a3d83605891e1397d0d065 is affected.
- Version 2.6.12 is affected.
- Before 2.6.12 is unaffected.
- Version 6.1.167, <= 6.1.* is unaffected.
- Version 6.6.130, <= 6.6.* is unaffected.
- Version 6.12.78, <= 6.12.* is unaffected.
- Version 6.18.20, <= 6.18.* is unaffected.
- Version 6.19.10, <= 6.19.* is unaffected.
- Version 7.0-rc5, <= * is unaffected.