{"api_version":"1","generated_at":"2026-08-15T08:45:14+00:00","cve":"CVE-2026-74436","urls":{"html":"https://cve.report/CVE-2026-74436","api":"https://cve.report/api/cve/CVE-2026-74436.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74436","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74436"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:45","updated_at":"2026-08-15 06:22:45"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5","name":"https://git.kernel.org/stable/c/dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33","name":"https://git.kernel.org/stable/c/1741378a7a83dfd8e53a9196730df709b903cd33","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573","name":"https://git.kernel.org/stable/c/0337cdba0c477f176c0459bed012109453184573","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17","name":"https://git.kernel.org/stable/c/dc175389b18c29a5303ee83169ec653adfae3e17","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d","name":"https://git.kernel.org/stable/c/35a967ff8b24db09ee429c39c5b5e6571639997d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74436","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74436","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 0337cdba0c477f176c0459bed012109453184573 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 35a967ff8b24db09ee429c39c5b5e6571639997d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 1741378a7a83dfd8e53a9196730df709b903cd33 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 dc175389b18c29a5303ee83169ec653adfae3e17 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.148 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.101 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/rxrpc/call_accept.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0337cdba0c477f176c0459bed012109453184573","status":"affected","version":"00e907127e6f86d0f9b122d9b4347a8aa09a8b61","versionType":"git"},{"lessThan":"dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5","status":"affected","version":"00e907127e6f86d0f9b122d9b4347a8aa09a8b61","versionType":"git"},{"lessThan":"35a967ff8b24db09ee429c39c5b5e6571639997d","status":"affected","version":"00e907127e6f86d0f9b122d9b4347a8aa09a8b61","versionType":"git"},{"lessThan":"1741378a7a83dfd8e53a9196730df709b903cd33","status":"affected","version":"00e907127e6f86d0f9b122d9b4347a8aa09a8b61","versionType":"git"},{"lessThan":"dc175389b18c29a5303ee83169ec653adfae3e17","status":"affected","version":"00e907127e6f86d0f9b122d9b4347a8aa09a8b61","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/rxrpc/call_accept.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.9"},{"lessThan":"4.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.148","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.101","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.148","versionStartIncluding":"4.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.101","versionStartIncluding":"4.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"4.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"4.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"4.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-08-15T05:59:34.687Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}],"title":"rxrpc: serialize kernel accept preallocation with socket teardown","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74436","datePublished":"2026-08-15T05:59:34.687Z","dateReserved":"2026-08-15T05:44:03.896Z","dateUpdated":"2026-08-15T05:59:34.687Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:45","lastModifiedDate":"2026-08-15 06:22:45","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74436","Ordinal":"1","Title":"rxrpc: serialize kernel accept preallocation with socket teardow","CVE":"CVE-2026-74436","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74436","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"rxrpc: serialize kernel accept preallocation with socket teardow"}]}}}