{"id":"CVE-2026-31400","state":"PUBLISHED","title":"sunrpc: fix cache_request leak in cache_release","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix cache_request leak in cache_release\n\nWhen a reader's file descriptor is closed while in the middle of reading\na cache_request (rp->offset != 0), cache_release() decrements the\nrequest's readers count but never checks whether it should free the\nrequest.\n\nIn cache_read(), when readers drops to 0 and CACHE_PENDING is clear, the\ncache_request is removed from the queue and freed along with its buffer\nand cache_head reference. cache_release() lacks this cleanup.\n\nThe only other path that frees requests with readers == 0 is\ncache_dequeue(), but it runs only when CACHE_PENDING transitions from\nset to clear. If that transition already happened while readers was\nstill non-zero, cache_dequeue() will have skipped the request, and no\nsubsequent call will clean it up.\n\nAdd the same cleanup logic from cache_read() to cache_release(): after\ndecrementing readers, check if it reached 0 with CACHE_PENDING clear,\nand if so, dequeue and free the cache_request.","publishedAt":"2026-04-03T15:16:03.906Z","updatedAt":"2026-05-11T22:07:57.975Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"1dfedb293943e491379c9302b428e6f920a73d12","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"f18c1f2a88ca91357916997cdb0f7adaf14fc497","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"7bcd5e318876ac638c8ceade7a648e76ac8c48e1","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"41f6ba6c98a618043d2cd71030bf9a752dfab8b2","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"301670dcd098c1fe5c2fe90fb3c7a8f4814d2351","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"be5c35960e5ead70862736161836e2d1bc7352dc","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"373457de14281c1fc7cace6fc4c8a267fc176673","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"17ad31b3a43b72aec3a3d83605891e1397d0d065","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/cache.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.20","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/cache.c"]}],"references":["https://git.kernel.org/stable/c/1dfedb293943e491379c9302b428e6f920a73d12","https://git.kernel.org/stable/c/f18c1f2a88ca91357916997cdb0f7adaf14fc497","https://git.kernel.org/stable/c/7bcd5e318876ac638c8ceade7a648e76ac8c48e1","https://git.kernel.org/stable/c/41f6ba6c98a618043d2cd71030bf9a752dfab8b2","https://git.kernel.org/stable/c/301670dcd098c1fe5c2fe90fb3c7a8f4814d2351","https://git.kernel.org/stable/c/be5c35960e5ead70862736161836e2d1bc7352dc","https://git.kernel.org/stable/c/373457de14281c1fc7cace6fc4c8a267fc176673","https://git.kernel.org/stable/c/17ad31b3a43b72aec3a3d83605891e1397d0d065"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31400.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31400","state":"PUBLISHED","datePublished":"2026-04-03T15:16:03.906Z","dateUpdated":"2026-05-11T22:07:57.975Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.086Z"},"containers":{"cna":{"title":"sunrpc: fix cache_request leak in cache_release","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix cache_request leak in cache_release\n\nWhen a reader's file descriptor is closed while in the middle of reading\na cache_request (rp->offset != 0), cache_release() decrements the\nrequest's readers count but never checks whether it should free the\nrequest.\n\nIn cache_read(), when readers drops to 0 and CACHE_PENDING is clear, the\ncache_request is removed from the queue and freed along with its buffer\nand cache_head reference. cache_release() lacks this cleanup.\n\nThe only other path that frees requests with readers == 0 is\ncache_dequeue(), but it runs only when CACHE_PENDING transitions from\nset to clear. If that transition already happened while readers was\nstill non-zero, cache_dequeue() will have skipped the request, and no\nsubsequent call will clean it up.\n\nAdd the same cleanup logic from cache_read() to cache_release(): after\ndecrementing readers, check if it reached 0 with CACHE_PENDING clear,\nand if so, dequeue and free the cache_request."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"1dfedb293943e491379c9302b428e6f920a73d12","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"f18c1f2a88ca91357916997cdb0f7adaf14fc497","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"7bcd5e318876ac638c8ceade7a648e76ac8c48e1","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"41f6ba6c98a618043d2cd71030bf9a752dfab8b2","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"301670dcd098c1fe5c2fe90fb3c7a8f4814d2351","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"be5c35960e5ead70862736161836e2d1bc7352dc","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"373457de14281c1fc7cace6fc4c8a267fc176673","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"17ad31b3a43b72aec3a3d83605891e1397d0d065","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/cache.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.20","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/cache.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1dfedb293943e491379c9302b428e6f920a73d12"},{"url":"https://git.kernel.org/stable/c/f18c1f2a88ca91357916997cdb0f7adaf14fc497"},{"url":"https://git.kernel.org/stable/c/7bcd5e318876ac638c8ceade7a648e76ac8c48e1"},{"url":"https://git.kernel.org/stable/c/41f6ba6c98a618043d2cd71030bf9a752dfab8b2"},{"url":"https://git.kernel.org/stable/c/301670dcd098c1fe5c2fe90fb3c7a8f4814d2351"},{"url":"https://git.kernel.org/stable/c/be5c35960e5ead70862736161836e2d1bc7352dc"},{"url":"https://git.kernel.org/stable/c/373457de14281c1fc7cace6fc4c8a267fc176673"},{"url":"https://git.kernel.org/stable/c/17ad31b3a43b72aec3a3d83605891e1397d0d065"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:07:57.975Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.18.20"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.19.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}