{"id":"CVE-2026-74436","summary":"rxrpc: serialize kernel accept preallocation with socket teardown","details":"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-\u003ebacklog without any\nsocket/backlog synchronization and passes that raw pointer into\nrxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc()\nsets rx-\u003ebacklog = 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.","modified":"2026-08-25T03:51:23.472020857Z","published":"2026-08-15T05:59:34.687Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74436.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573"},{"type":"WEB","url":"https://git.kernel.org/stable/c/11b429b84c87cb5a0152f14e7d6cb649ed363901"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33"},{"type":"WEB","url":"https://git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c20d983968f239574290cf804a58cde18ad1c559"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d6207326b4ca0ae1041281b6af9df53f8080669a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74436.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74436"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"00e907127e6f86d0f9b122d9b4347a8aa09a8b61"},{"fixed":"d6207326b4ca0ae1041281b6af9df53f8080669a"},{"fixed":"11b429b84c87cb5a0152f14e7d6cb649ed363901"},{"fixed":"c20d983968f239574290cf804a58cde18ad1c559"},{"fixed":"0337cdba0c477f176c0459bed012109453184573"},{"fixed":"dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5"},{"fixed":"35a967ff8b24db09ee429c39c5b5e6571639997d"},{"fixed":"1741378a7a83dfd8e53a9196730df709b903cd33"},{"fixed":"dc175389b18c29a5303ee83169ec653adfae3e17"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74436.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.9.0"},{"fixed":"5.10.266"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.217"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.184"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74436.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}