{"id":"CVE-2026-31400","title":"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_relea…","summary":"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_relea…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-401"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.12.1, < 5.10.253","linux_kernel >= 5.11, < 5.15.203","linux_kernel >= 5.16, < 6.1.167","linux_kernel >= 6.2, < 6.6.130","linux_kernel >= 6.7, < 6.12.78","linux_kernel >= 6.13, < 6.18.20","linux_kernel >= 6.19, < 6.19.10","linux_kernel = 2.6.12","linux_kernel = 7.0"],"patched":["linux_kernel 6.19.10"],"published":"2026-04-03","updated":"2026-07-24","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-31400","references":[{"url":"https://git.kernel.org/stable/c/17ad31b3a43b72aec3a3d83605891e1397d0d065","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1dfedb293943e491379c9302b428e6f920a73d12","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/301670dcd098c1fe5c2fe90fb3c7a8f4814d2351","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/373457de14281c1fc7cace6fc4c8a267fc176673","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/41f6ba6c98a618043d2cd71030bf9a752dfab8b2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7bcd5e318876ac638c8ceade7a648e76ac8c48e1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/be5c35960e5ead70862736161836e2d1bc7352dc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f18c1f2a88ca91357916997cdb0f7adaf14fc497","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00117,"epssPercentile":0.01887,"ingestedAt":"2026-07-25T22:05:04.239Z","slug":"CVE-2026-31400","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `linux_kernel >= 2.6.12.1, < 5.10.253`\n- `linux_kernel >= 5.11, < 5.15.203`\n- `linux_kernel >= 5.16, < 6.1.167`\n- `linux_kernel >= 6.2, < 6.6.130`\n- `linux_kernel >= 6.7, < 6.12.78`\n- `linux_kernel >= 6.13, < 6.18.20`\n- `linux_kernel >= 6.19, < 6.19.10`\n- `linux_kernel = 2.6.12`\n- `linux_kernel = 7.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.19.10`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}