{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74428","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.895Z","datePublished":"2026-08-15T05:59:29.668Z","dateUpdated":"2026-08-17T05:47:03.327Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:47:03.327Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix double unlock in rxrpc_recvmsg()\n\nFix a double unlock in rxrpc_recvmsg() when dealing with OOB messages."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - RxRPC processes CHALLENGE packets from remote UDP peers; with RXRPC_MANAGE_RESPONSE and RxGK security, a network peer can queue OOB challenges that are consumed on the next recvmsg() during normal client authentication (e.g., AFS/YFS).\nAC:L - An attacker who is the RxRPC peer (or a local user running a malicious server) can reliably deliver a CHALLENGE and trigger recvmsg() on demand; no rare timing, layout, or victim state outside attacker control is required.\nPR:N - No administrative capability is needed on the victim; any remote peer in an RxRPC connection can send CHALLENGE packets, and unprivileged local users can create AF_RXRPC sockets, set MANAGE_RESPONSE, and call recvmsg() without special privileges.\nUI:N - Exploitation does not require victim interaction beyond normal automated RxRPC/AFS client operation; recvmsg() is invoked automatically when OOB challenges are queued during connection security negotiation.\nS:U - Impact is confined to kernel memory and locking on the affected host; it does not cross VM, container, or IOMMU security boundaries into a separate authority.\nC:H - Double release_sock() corrupts socket lock ownership, allowing concurrent unsynchronized access to socket/call state and adjacent kernel heap objects, which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The corrupted socket lock permits overlapping recvmsg()/sendmsg() access to connection and skb state, enabling heap corruption and control-flow hijack primitives typical of kernel locking bugs.\nA:H - The double unlock triggers lockdep warnings and can panic/oops the kernel or hang socket I/O when concurrent threads access the same RxRPC socket after ownership is incorrectly cleared."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/recvmsg.c"],"versions":[{"version":"5800b1cf3fd8ccab752a101865be1e76dac33142","lessThan":"8cd8cf3052fff9a4b86b25734f610e4af03786d3","status":"affected","versionType":"git"},{"version":"5800b1cf3fd8ccab752a101865be1e76dac33142","lessThan":"1297ae6aeebc3863cb437e42a1bc4cd6173e43d9","status":"affected","versionType":"git"},{"version":"5800b1cf3fd8ccab752a101865be1e76dac33142","lessThan":"a2f299b4d5510147fa8629a6aba2869bbcc88aea","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/recvmsg.c"],"versions":[{"version":"6.16","status":"affected"},{"version":"0","lessThan":"6.16","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/8cd8cf3052fff9a4b86b25734f610e4af03786d3"},{"url":"https://git.kernel.org/stable/c/1297ae6aeebc3863cb437e42a1bc4cd6173e43d9"},{"url":"https://git.kernel.org/stable/c/a2f299b4d5510147fa8629a6aba2869bbcc88aea"}],"title":"rxrpc: Fix double unlock in rxrpc_recvmsg()","x_generator":{"engine":"bippy-1.2.0"}}}}