CVE-2026-74435

{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/rxrpc/recvmsg.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8bbede0afced346b24e4fbde0c68cf12980ba948", "status": "affected", "version": "a05bf6d9e621fa71e89ccebe3047ba45218d7b38", "versionType": "git"}, {"lessThan": "6563b4eb38c35d75892445bcf8aacdc29914821c", "status": "affected", "version": "b94a6ccbaf1104dd980150a65fdeb2f69d17d2f5", "versionType": "git"}, {"lessThan": "d3b642cf95d48234590cc91450d8705a9bf6b540", "status": "affected", "version": "46cb765e2e5ad52303ea157e10d370bb6b7acbbf", "versionType": "git"}, {"lessThan": "a962bc8508592c4d51092edac68579bd8b18fe44", "status": "affected", "version": "d2bc90cf6c75cb96d2ce549be6c35efa3099d25b", "versionType": "git"}, {"lessThan": "16c8ae9735c5bd7e54dd7478d6348e0fc860842d", "status": "affected", "version": "d2bc90cf6c75cb96d2ce549be6c35efa3099d25b", "versionType": "git"}, {"status": "affected", "version": "c580087743712112778a06d65a4074053072d7bf", "versionType": "git"}, {"lessThan": "6.6.145", "status": "affected", "version": "6.6.143", "versionType": "semver"}, {"lessThan": "6.12.97", "status": "affected", "version": "6.12.93", "versionType": "semver"}, {"lessThan": "6.18.40", "status": "affected", "version": "6.18.35", "versionType": "semver"}, {"lessThan": "7.1", "status": "affected", "version": "7.0.11", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/rxrpc/recvmsg.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "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", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-74435", "lastModified": "2026-08-17T06:19:39.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:45.607", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/16c8ae9735c5bd7e54dd7478d6348e0fc860842d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6563b4eb38c35d75892445bcf8aacdc29914821c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8bbede0afced346b24e4fbde0c68cf12980ba948"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a962bc8508592c4d51092edac68579bd8b18fe44"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d3b642cf95d48234590cc91450d8705a9bf6b540"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc", "id": "2516863", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516863"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the rxrpc subsystem of the Linux kernel. This vulnerability occurs when the rxrpc_verify_data function fails to allocate a necessary buffer if the incoming data length is zero. An attacker could exploit this by sending specially crafted network packets, leading to a NULL pointer dereference and potentially causing a system crash, resulting in a denial of service."], "name": "CVE-2026-74435", "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74435\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74435\nhttps://lore.kernel.org/linux-cve-announce/2026081515-CVE-2026-74435-906c@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a05bf6d9e621fa71e89ccebe3047ba45218d7b38,8bbede0afced346b24e4fbde0c68cf12980ba948)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b94a6ccbaf1104dd980150a65fdeb2f69d17d2f5,6563b4eb38c35d75892445bcf8aacdc29914821c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6563b4eb38c35d75892445bcf8aacdc29914821c,8bbede0afced346b24e4fbde0c68cf12980ba948)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[46cb765e2e5ad52303ea157e10d370bb6b7acbbf,d3b642cf95d48234590cc91450d8705a9bf6b540)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d2bc90cf6c75cb96d2ce549be6c35efa3099d25b,a962bc8508592c4d51092edac68579bd8b18fe44)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d2bc90cf6c75cb96d2ce549be6c35efa3099d25b,16c8ae9735c5bd7e54dd7478d6348e0fc860842d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "c580087743712112778a06d65a4074053072d7bf"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.143,6.6.145)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.93,6.12.97)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.0.11,7.1)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T17:00:12.631878+00:00", "updated": "2026-08-17T14:30:06.670150+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476"]}