{"id":"CVE-2026-90151","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: remove callback IDR entry on client allocation failure\n\nnfs4_alloc_client() allocates an NFSv4.0 callback identifier before it\nfinishes setting up the client","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: remove callback IDR entry on client allocation failure\n\nnfs4_alloc_client() allocates an NFSv4.0 callback identifier before it\nfinishes setting up the client. If…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1 < 68c721391b761dbe38d5b0094d2bb6e8489ad92b","Linux >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1 < 9bfdd0f591307b5198826a0e7a5b2f35f87acd2d","Linux >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1 < 7c4812eb96bdcafb31a65b12f2aa96659429d1d4","Linux >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1 < fc95ca82d5ae598c428ab5a00ae69f8526d59371","Linux >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1 < 80b1c3d5a881f7d9081aa9f46da9742878a0f893","Linux >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1 < 3f2387e8bfbc4efda5d77c3a11a028d0a119c48f","Linux >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1 < 5891c03e150920618db0e9c4ea2d772abacdcfd1","Linux >= f4eecd5da3422e82e88e36c33cbd2595eebcacb1 < d05c2007b3d84ccba11dc6e9cb3202768cc72f14","Linux 2.6.38"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:44.250","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90151","references":[{"url":"https://git.kernel.org/stable/c/3f2387e8bfbc4efda5d77c3a11a028d0a119c48f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5891c03e150920618db0e9c4ea2d772abacdcfd1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/68c721391b761dbe38d5b0094d2bb6e8489ad92b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7c4812eb96bdcafb31a65b12f2aa96659429d1d4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/80b1c3d5a881f7d9081aa9f46da9742878a0f893","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9bfdd0f591307b5198826a0e7a5b2f35f87acd2d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d05c2007b3d84ccba11dc6e9cb3202768cc72f14","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fc95ca82d5ae598c428ab5a00ae69f8526d59371","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00793,"epssPercentile":0.54418,"ingestedAt":"2026-09-17T16:21:47.877Z","slug":"CVE-2026-90151","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: remove callback IDR entry on client allocation failure\n\nnfs4_alloc_client() allocates an NFSv4.0 callback identifier before it\nfinishes setting up the client. If any later initialization step fails,\nthe error path frees the nfs_client directly with nfs_free_client(). That\nbypasses nfs_put_client(), which is where the callback IDR entry is\nremoved during normal teardown.\n\nA failed allocation can therefore leave cb_ident_idr pointing at a freed\nnfs_client. A later NFSv4.0 callback lookup by cb_ident would find the\nstale pointer and take a reference to it.\n\nMake the callback IDR removal helper callable by the allocation failure\npath, and remove the callback identifier before freeing the client.\n\nThis was found by a local static-analysis checker for publish-before-free\nlifetime bugs and confirmed by manual inspection.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[{"seq":207151,"id":"CVE-2026-90151","ts":1789757336312,"field":"cvss","old":null,"new":"9.8"},{"seq":207150,"id":"CVE-2026-90151","ts":1789757336312,"field":"severity","old":"none","new":"critical"}]}