{"id":"CVE-2026-74431","state":"PUBLISHED","title":"rxrpc: Fix potential infinite loop in rxrpc_recvmsg()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix potential infinite loop in rxrpc_recvmsg()\n\nFix the wait in rxrpc_recvmsg() also take check the oob queue.","publishedAt":"2026-08-15T05:59:31.586Z","updatedAt":"2026-08-17T05:47:06.624Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5800b1cf3fd8ccab752a101865be1e76dac33142","status":"affected","lessThan":"0fc5b37faec26241d3cbee732e29ac35ad3184f8","versionType":"git"},{"version":"5800b1cf3fd8ccab752a101865be1e76dac33142","status":"affected","lessThan":"da371b003a4a44f44741275d5e8dc74181cbb017","versionType":"git"},{"version":"5800b1cf3fd8ccab752a101865be1e76dac33142","status":"affected","lessThan":"67a0332f442ef07713cd2d9c13d59db0f1c23648","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/recvmsg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/recvmsg.c"]}],"references":["https://git.kernel.org/stable/c/0fc5b37faec26241d3cbee732e29ac35ad3184f8","https://git.kernel.org/stable/c/da371b003a4a44f44741275d5e8dc74181cbb017","https://git.kernel.org/stable/c/67a0332f442ef07713cd2d9c13d59db0f1c23648"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74431.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74431","state":"PUBLISHED","datePublished":"2026-08-15T05:59:31.586Z","dateUpdated":"2026-08-17T05:47:06.624Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.895Z"},"containers":{"cna":{"title":"rxrpc: Fix potential infinite loop in rxrpc_recvmsg()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix potential infinite loop in rxrpc_recvmsg()\n\nFix the wait in rxrpc_recvmsg() also take check the oob queue."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5800b1cf3fd8ccab752a101865be1e76dac33142","status":"affected","lessThan":"0fc5b37faec26241d3cbee732e29ac35ad3184f8","versionType":"git"},{"version":"5800b1cf3fd8ccab752a101865be1e76dac33142","status":"affected","lessThan":"da371b003a4a44f44741275d5e8dc74181cbb017","versionType":"git"},{"version":"5800b1cf3fd8ccab752a101865be1e76dac33142","status":"affected","lessThan":"67a0332f442ef07713cd2d9c13d59db0f1c23648","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/recvmsg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/recvmsg.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0fc5b37faec26241d3cbee732e29ac35ad3184f8"},{"url":"https://git.kernel.org/stable/c/da371b003a4a44f44741275d5e8dc74181cbb017"},{"url":"https://git.kernel.org/stable/c/67a0332f442ef07713cd2d9c13d59db0f1c23648"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - RxRPC processes CHALLENGE packets from remote UDP peers in net/rxrpc/io_thread.c through rxrpc_input_conn_packet() into recvmsg_oobq; a malicious or compromised AFS/YFS fileserver can deliver the trigger over the network without local access.\nAC:L - Once a victim RxGK client with RXRPC_MANAGE_RESPONSE has an established connection, a remote peer can send a valid CHALLENGE at any time and reliably strand a blocking recvmsg() in the defective wait path whenever recvmsg_q is empty but recvmsg_oobq is not.\nPR:N - Exploitation requires only the ability to act as the remote RxRPC server peer on an existing client connection; the attacker needs no local account, capabilities, or authentication on the victim host.\nUI:N - The hang is triggered during normal blocking recvmsg() operation while waiting for call data; no additional victim action beyond routine client connectivity is required at exploitation time.\nS:U - Impact is confined to the kernel thread executing recvmsg() on the affected AF_RXRPC socket within the same security authority; there is no cross-boundary escape to other VMs, containers, or privilege domains.\nC:N - This is a control-flow logic error in the recvmsg() wait loop with no out-of-bounds access, use-after-free, or information disclosure; no memory is read or leaked to the attacker.\nI:N - The bug causes an infinite busy-loop in recvmsg() without modifying kernel or user data, corrupting memory, or enabling arbitrary writes or code execution.\nA:H - When recvmsg_q is empty but recvmsg_oobq holds a CHALLENGE, the pre-fix code re-enters try_again without sleeping or dequeuing OOB data, causing an infinite kernel loop that hangs the calling thread and can saturate a CPU core."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:47:06.624Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}