{"id":"CVE-2026-74436","title":"rxrpc: serialize kernel accept preallocation with socket teardown","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: serialize kernel accept preallocation with socket teardown\n\nrxrpc_kernel_charge_accept() reads rx->backlog without any\nsocket/backlog synchronization and passes …","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","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < d6207326b4ca0ae1041281b6af9df53f8080669a","Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 11b429b84c87cb5a0152f14e7d6cb649ed363901","Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < c20d983968f239574290cf804a58cde18ad1c559","Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 0337cdba0c477f176c0459bed012109453184573","Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5","Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 35a967ff8b24db09ee429c39c5b5e6571639997d","Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 1741378a7a83dfd8e53a9196730df709b903cd33","Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < dc175389b18c29a5303ee83169ec653adfae3e17","Linux 4.9"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T18:56:22.698412Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:05:45.032Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74436","references":[{"url":"https://git.kernel.org/stable/c/d6207326b4ca0ae1041281b6af9df53f8080669a"},{"url":"https://git.kernel.org/stable/c/11b429b84c87cb5a0152f14e7d6cb649ed363901"},{"url":"https://git.kernel.org/stable/c/c20d983968f239574290cf804a58cde18ad1c559"},{"url":"https://git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573"},{"url":"https://git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5"},{"url":"https://git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d"},{"url":"https://git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33"},{"url":"https://git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17"}],"tags":["cve.org"],"epss":0.00399,"epssPercentile":0.32548,"ingestedAt":"2026-10-16T19:46:24.365Z","slug":"CVE-2026-74436","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: serialize kernel accept preallocation with socket teardown\n\nrxrpc_kernel_charge_accept() reads rx->backlog without any\nsocket/backlog synchronization and passes that raw pointer into\nrxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc()\nsets rx->backlog = NULL and frees the backlog rings, so a kernel\npreallocation worker can keep using a freed struct rxrpc_backlog\nwhile updating *_backlog_head/tail and array slots.\n\nSerialize the state check and backlog lookup with the socket lock,\nand reject kernel preallocation once teardown has disabled\nlistening or discarded the service backlog.\n\n## Affected\n\n- `Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < d6207326b4ca0ae1041281b6af9df53f8080669a`\n- `Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 11b429b84c87cb5a0152f14e7d6cb649ed363901`\n- `Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < c20d983968f239574290cf804a58cde18ad1c559`\n- `Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 0337cdba0c477f176c0459bed012109453184573`\n- `Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5`\n- `Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 35a967ff8b24db09ee429c39c5b5e6571639997d`\n- `Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < 1741378a7a83dfd8e53a9196730df709b903cd33`\n- `Linux >= 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 < dc175389b18c29a5303ee83169ec653adfae3e17`\n- `Linux 4.9`\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":0.1,"exploitation":0,"ransomware":0},"changes":[]}