{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74435","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.896Z","datePublished":"2026-08-15T05:59:34.073Z","dateUpdated":"2026-08-17T05:47:09.898Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:47:09.898Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc\n\nrxrpc_recvmsg_data() calls rxrpc_verify_data() whenever the\nrxrpc_call.rx_dec_buffer is unallocated and assumes that upon\nsuccessful return that rx_dec_buffer must be allocated.\nHowever, rxrpc_verify_data() does not request an allocation if\nthe rxrpc_skb_priv.len is zero.\n\nIn addition, failure to allocate rx_dec_buffer will result in a\ncall to skb_copy_bits() with a NULL destination which can\ntrigger a NULL pointer dereference.\n\nTo prevent these issues rxrpc_verify_data() is modified to\nalways attempt to allocate the rxrpc_call.rx_dec_buffer if it\nis NULL.\n\nThis issue was identified with assistance of a private\nsashiko instance."}],"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 runs over UDP/IP; a remote peer can deliver crafted DATA packets that are queued on the receive path and later processed in rxrpc_verify_data() via recvmsg/kernel_recv_data, with no local access required.\nAC:L - An attacker can reliably trigger the bug by sending a zero-length RxRPC DATA packet (header-only skb so sp->len==0) to a listening service; no races or victim-specific state are needed beyond an active RxRPC/AFS endpoint.\nPR:N - Incoming DATA packets are accepted and queued on new calls before Kerberos authentication completes, so an unauthenticated remote attacker can reach the vulnerable recvmsg path on internet-facing AFS/RxRPC servers without any local privileges.\nUI:N - On AFS/RxRPC servers the kernel automatically receives network DATA, queues it, and invokes rxrpc_kernel_recv_data through service callbacks; exploitation requires no victim user action such as mounting a filesystem or opening a file.\nS:U - The flaw causes a kernel NULL pointer dereference during in-kernel packet processing on the same host running the RxRPC/AFS service; it does not cross a VM, container, or IOMMU security boundary.\nC:N - The failure mode is a NULL pointer dereference in skb_copy_bits()/subsequent recvmsg handling when rx_dec_buffer was never allocated; this is a pure crash path with no demonstrated or plausible arbitrary kernel memory read or information disclosure.\nI:N - No memory corruption, arbitrary write, or code-execution primitive is introduced; the bug dereferences a NULL decryption buffer during receive processing and results in kernel oops/panic rather than controlled data modification.\nA:H - A successful trigger causes a kernel NULL pointer dereference during recvmsg data verification/decryption, which can oops or panic the host and deny service to all workloads on affected AFS/RxRPC servers until reboot."}]}],"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":"a05bf6d9e621fa71e89ccebe3047ba45218d7b38","lessThan":"8bbede0afced346b24e4fbde0c68cf12980ba948","status":"affected","versionType":"git"},{"version":"b94a6ccbaf1104dd980150a65fdeb2f69d17d2f5","lessThan":"6563b4eb38c35d75892445bcf8aacdc29914821c","status":"affected","versionType":"git"},{"version":"46cb765e2e5ad52303ea157e10d370bb6b7acbbf","lessThan":"d3b642cf95d48234590cc91450d8705a9bf6b540","status":"affected","versionType":"git"},{"version":"d2bc90cf6c75cb96d2ce549be6c35efa3099d25b","lessThan":"a962bc8508592c4d51092edac68579bd8b18fe44","status":"affected","versionType":"git"},{"version":"d2bc90cf6c75cb96d2ce549be6c35efa3099d25b","lessThan":"16c8ae9735c5bd7e54dd7478d6348e0fc860842d","status":"affected","versionType":"git"},{"version":"c580087743712112778a06d65a4074053072d7bf","status":"affected","versionType":"git"},{"version":"6.6.143","lessThan":"6.6.145","status":"affected","versionType":"semver"},{"version":"6.12.93","lessThan":"6.12.97","status":"affected","versionType":"semver"},{"version":"6.18.35","lessThan":"6.18.40","status":"affected","versionType":"semver"},{"version":"7.0.11","lessThan":"7.1","status":"affected","versionType":"semver"}]},{"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":"7.1","status":"affected"},{"version":"0","lessThan":"7.1","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","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":"6.6.143","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.93","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.35","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.1","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.1","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0.11"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/8bbede0afced346b24e4fbde0c68cf12980ba948"},{"url":"https://git.kernel.org/stable/c/6563b4eb38c35d75892445bcf8aacdc29914821c"},{"url":"https://git.kernel.org/stable/c/d3b642cf95d48234590cc91450d8705a9bf6b540"},{"url":"https://git.kernel.org/stable/c/a962bc8508592c4d51092edac68579bd8b18fe44"},{"url":"https://git.kernel.org/stable/c/16c8ae9735c5bd7e54dd7478d6348e0fc860842d"}],"title":"rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc","x_generator":{"engine":"bippy-1.2.0"}}}}