{"id":"CVE-2026-64355","state":"PUBLISHED","title":"bpf: Reject fragmented frames in devmap","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject fragmented frames in devmap\n\nDevmap broadcast redirects clone the packet for all but the last\ndestination.\n\nFor native XDP, that clone path copies only the linear xdp_frame data,\nwhile fragmented frames keep skb_shared_info in tailroom outside the\nlinear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but\nwithout valid frag metadata, and the later free path can interpret\nuninitialized tail data as skb_shared_info, leading to an out-of-bounds\naccess during frame return.\n\nReject fragmented native XDP frames in dev_map_enqueue_clone().\n\nAdd the same restriction to the generic XDP clone path in\ndev_map_redirect_clone(). Generic XDP represents fragmented packets as\nnonlinear skbs, and rejecting them here keeps clone-based broadcast\nsupport aligned between native and generic XDP.","publishedAt":"2026-07-25T08:50:13.410Z","updatedAt":"2026-10-19T20:38:24.590Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"47baddc856ae7e93a565dd9deeb797999b179466","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"07a4c11ee8ef4abcb39d922e9e410ae269671cdf","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"bccbab36ff228e0825eb85d9b0f9b8434cd0a399","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"c5b4f5efcb55c1af3fe44ff712d31b7fb098a831","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"a9bb2d9c798cb62a4050a991c27b752770c33afe","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"51d07c12ca411e692c424ecdabf077f1e61a61be","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"aa496720618f1a6054f1c870bf10b4f6c99bf656","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/devmap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","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":["kernel/bpf/devmap.c"]}],"references":["https://git.kernel.org/stable/c/47baddc856ae7e93a565dd9deeb797999b179466","https://git.kernel.org/stable/c/07a4c11ee8ef4abcb39d922e9e410ae269671cdf","https://git.kernel.org/stable/c/bccbab36ff228e0825eb85d9b0f9b8434cd0a399","https://git.kernel.org/stable/c/c5b4f5efcb55c1af3fe44ff712d31b7fb098a831","https://git.kernel.org/stable/c/a9bb2d9c798cb62a4050a991c27b752770c33afe","https://git.kernel.org/stable/c/51d07c12ca411e692c424ecdabf077f1e61a61be","https://git.kernel.org/stable/c/aa496720618f1a6054f1c870bf10b4f6c99bf656"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64355.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64355","state":"PUBLISHED","datePublished":"2026-07-25T08:50:13.410Z","dateUpdated":"2026-10-19T20:38:24.590Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.782Z"},"containers":{"cna":{"title":"bpf: Reject fragmented frames in devmap","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject fragmented frames in devmap\n\nDevmap broadcast redirects clone the packet for all but the last\ndestination.\n\nFor native XDP, that clone path copies only the linear xdp_frame data,\nwhile fragmented frames keep skb_shared_info in tailroom outside the\nlinear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but\nwithout valid frag metadata, and the later free path can interpret\nuninitialized tail data as skb_shared_info, leading to an out-of-bounds\naccess during frame return.\n\nReject fragmented native XDP frames in dev_map_enqueue_clone().\n\nAdd the same restriction to the generic XDP clone path in\ndev_map_redirect_clone(). Generic XDP represents fragmented packets as\nnonlinear skbs, and rejecting them here keeps clone-based broadcast\nsupport aligned between native and generic XDP."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"47baddc856ae7e93a565dd9deeb797999b179466","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"07a4c11ee8ef4abcb39d922e9e410ae269671cdf","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"bccbab36ff228e0825eb85d9b0f9b8434cd0a399","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"c5b4f5efcb55c1af3fe44ff712d31b7fb098a831","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"a9bb2d9c798cb62a4050a991c27b752770c33afe","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"51d07c12ca411e692c424ecdabf077f1e61a61be","versionType":"git"},{"version":"e624d4ed4aa8cc3c69d1359b0aaea539203ed266","status":"affected","lessThan":"aa496720618f1a6054f1c870bf10b4f6c99bf656","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/devmap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","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":["kernel/bpf/devmap.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/47baddc856ae7e93a565dd9deeb797999b179466"},{"url":"https://git.kernel.org/stable/c/07a4c11ee8ef4abcb39d922e9e410ae269671cdf"},{"url":"https://git.kernel.org/stable/c/bccbab36ff228e0825eb85d9b0f9b8434cd0a399"},{"url":"https://git.kernel.org/stable/c/c5b4f5efcb55c1af3fe44ff712d31b7fb098a831"},{"url":"https://git.kernel.org/stable/c/a9bb2d9c798cb62a4050a991c27b752770c33afe"},{"url":"https://git.kernel.org/stable/c/51d07c12ca411e692c424ecdabf077f1e61a61be"},{"url":"https://git.kernel.org/stable/c/aa496720618f1a6054f1c870bf10b4f6c99bf656"}],"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 - A remote peer can send an oversized packet that a fragment-capable NIC represents as a multi-buffer XDP frame, reaching the vulnerable devmap broadcast clone path on a configured forwarding host.\nAC:L - No race or uncontrollable timing condition is required; fragmented packets reliably enter the faulty clone path and can be sent repeatedly.\nPR:N - Although initial-namespace CAP_BPF and CAP_NET_ADMIN are needed to configure the XDP deployment, the attacker sending packets through the already-configured unauthenticated data path needs no privileges.\nUI:N - Packet reception and XDP processing occur automatically without victim action.\nS:U - The corruption compromises resources governed by the same host-kernel security authority and does not inherently cross a VM, IOMMU, or other distinct boundary.\nC:H - Uninitialized fragment descriptors are consumed as page references and can be used by scatter-gather transmitters for unintended DMA mappings, potentially exposing arbitrary kernel memory.\nI:H - An uninitialized fragment count can overrun fixed-size driver arrays, while bogus page references can cause invalid refcount decrements, premature frees, and exploitable kernel memory corruption.\nA:H - Invalid fragment metadata can fault during DMA mapping, transmission, or frame return and cause a kernel oops or panic; an attacker can trigger this repeatedly."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:54:01.161Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-64355","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:39:19.688076Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","type":"CWE","description":"CWE-787 Out-of-bounds Write"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:38:24.590Z"}}]}}}