{"id":"CVE-2026-74436","revision":"a7f44d1fb74e4d29810b2f2dc20d8579","records":[{"revision":"a7f44d1fb74e4d29810b2f2dc20d8579","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74436","aliases":[],"title":"rxrpc: serialize kernel accept preallocation with socket teardown","description":"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 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.","state":0,"publishedAt":"2026-08-15T05:59:34.687+00:00","modifiedAt":"2026-10-16T19:05:45.032+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/rxrpc/call_accept.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"00e907127e6f86d0f9b122d9b4347a8aa09a8b61\",\n                            \"lessThan\": \"d6207326b4ca0ae1041281b6af9df53f8080669a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"00e907127e6f86d0f9b122d9b4347a8aa09a8b61\",\n                            \"lessThan\": \"11b429b84c87cb5a0152f14e7d6cb649ed363901\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"00e907127e6f86d0f9b122d9b4347a8aa09a8b61\",\n                            \"lessThan\": \"c20d983968f239574290cf804a58cde18ad1c559\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"00e907127e6f86d0f9b122d9b4347a8aa09a8b61\",\n                            \"lessThan\": \"0337cdba0c477f176c0459bed012109453184573\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"00e907127e6f86d0f9b122d9b4347a8aa09a8b61\",\n                            \"lessThan\": \"dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"00e907127e6f86d0f9b122d9b4347a8aa09a8b61\",\n                            \"lessThan\": \"35a967ff8b24db09ee429c39c5b5e6571639997d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"00e907127e6f86d0f9b122d9b4347a8aa09a8b61\",\n                            \"lessThan\": \"1741378a7a83dfd8e53a9196730df709b903cd33\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"00e907127e6f86d0f9b122d9b4347a8aa09a8b61\",\n                            \"lessThan\": \"dc175389b18c29a5303ee83169ec653adfae3e17\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/rxrpc/call_accept.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.266\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.217\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.184\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.148\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.101\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.40\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.5\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/d6207326b4ca0ae1041281b6af9df53f8080669a","https://git.kernel.org/stable/c/11b429b84c87cb5a0152f14e7d6cb649ed363901","https://git.kernel.org/stable/c/c20d983968f239574290cf804a58cde18ad1c559","https://git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573","https://git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5","https://git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d","https://git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33","https://git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74436","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74436","identifiers":["CVE-2026-74436"]},"retained":false,"historicalAffected":[]}],"coverage":[]}