CVE-2026-63926

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For inserts into a\nnon-first SG entry, this over-advances the offset and leaves the split\nlayout inconsistent.\n\nAdvance the right fragment offset by the fragment-local delta,\n`start - offset`, which matches the length removed from the front of the\noriginal entry."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached through the BPF sk_msg/sockmap send path (sendmsg \u2192 tcp_bpf_send_verdict \u2192 sk_psock_msg_verdict \u2192 bpf_msg_push_data), which requires local syscalls and BPF setup; per kernel CNA guidance, BPF/sockmap issues are scored as Local rather than Network.\nAC:L - An attacker who can load a sk_msg BPF program fully controls the insertion offset and can reliably build multi-fragment scatterlist messages (e.g., via large sendmsg/sendfile) to hit the non-first-entry split path; a public PoC demonstrates deterministic triggering without races or external victim state.\nPR:N - While direct exploitation requires CAP_NET_ADMIN+CAP_BPF to load sockmap/sk_msg programs (obtainable as PR:L via user namespaces), the highest-impact reasonable scenario is an unauthenticated remote client triggering a pre-deployed internet-facing kTLS/sockmap proxy whose sk_msg BPF calls bpf_msg_push_data during outbound processing, requiring no privileges on the victim host.\nUI:N - Exploitation requires no victim user interaction beyond normal network I/O to a service that already runs sockmap/sk_msg BPF; the attacker does not need the victim to mount filesystems, open files, or take other deliberate actions.\nS:U - Impact is kernel heap memory corruption within the same kernel security authority (privilege escalation, memory disclosure, or crash), not a cross-boundary escape such as VM guest-to-host or IOMMU bypass.\nC:H - The incorrect rsge.offset over-advances the page-local offset for non-first scatterlist fragments, causing out-of-bounds reads when subsequent helpers (e.g., bpf_msg_pull_data via sg_virt/memcpy) or the TCP send path consume the corrupted entry; the public PoC shows a 32,752-byte OOB read/UAF.\nI:H - Scatterlist metadata corruption produces inconsistent length/offset pairs that can drive out-of-bounds kernel memory access and is a standard heap corruption primitive potentially weaponizable for arbitrary write or control-flow hijack, not merely a bounded data error.\nA:H - Corrupted scatterlist state can cause kernel oops/panic from out-of-bounds page access (as shown in the PoC KASAN trace) or destabilize subsequent sk_msg/TCP/kTLS transmit processing, resulting in denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/filter.c"], "versions": [{"version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28", 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"unaffected", "versionType": "semver"}, {"version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "4.20", "versionEndExcluding": "5.10.259"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", 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"https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1"}, {"url": "https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b"}, {"url": "https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346"}, {"url": "https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f"}], "title": "bpf: sockmap: fix tail fragment offset in bpf_msg_push_data", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63926", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:33:38.098543Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", 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a public PoC demonstrates deterministic triggering without races or external victim state.\nPR:N - While direct exploitation requires CAP_NET_ADMIN+CAP_BPF to load sockmap/sk_msg programs (obtainable as PR:L via user namespaces), the highest-impact reasonable scenario is an unauthenticated remote client triggering a pre-deployed internet-facing kTLS/sockmap proxy whose sk_msg BPF calls bpf_msg_push_data during outbound processing, requiring no privileges on the victim host.\nUI:N - Exploitation requires no victim user interaction beyond normal network I/O to a service that already runs sockmap/sk_msg BPF; the attacker does not need the victim to mount filesystems, open files, or take other deliberate actions.\nS:U - Impact is kernel heap memory corruption within the same kernel security authority (privilege escalation, memory disclosure, or crash), not a cross-boundary escape such as VM guest-to-host or IOMMU bypass.\nC:H - The incorrect rsge.offset over-advances the page-local offset for non-first scatterlist fragments, causing out-of-bounds reads when subsequent helpers (e.g., bpf_msg_pull_data via sg_virt/memcpy) or the TCP send path consume the corrupted entry; the public PoC shows a 32,752-byte OOB read/UAF.\nI:H - Scatterlist metadata corruption produces inconsistent length/offset pairs that can drive out-of-bounds kernel memory access and is a standard heap corruption primitive potentially weaponizable for arbitrary write or control-flow hijack, not merely a bounded data error.\nA:H - Corrupted scatterlist state can cause kernel oops/panic from out-of-bounds page access (as shown in the PoC KASAN trace) or destabilize subsequent sk_msg/TCP/kTLS transmit processing, resulting in denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28", "lessThan": "f14609d8146707452e0822f3c8154674ce677251", "versionType": "git"}, {"status": "affected", "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28", "lessThan": "d81b323af2dcee47573907ccb89c0df9b45cb2e2", "versionType": "git"}, {"status": "affected", "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28", "lessThan": "aeb95146848d12206e1b2cfacd4f40e21ce81d94", "versionType": "git"}, {"status": "affected", "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28", "lessThan": "96b72672ce849a1402730238e64d9b20bf06a96d", "versionType": "git"}, {"status": "affected", "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28", "lessThan": "3075c21d2d76c0067f4a382765b43d6cc10470f1", "versionType": "git"}, {"status": "affected", "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28", "lessThan": "5e19028667963fb371ebb00cecc2a473ef92056b", "versionType": "git"}, {"status": "affected", "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28", "lessThan": "63f64a510c7917658ddf4d073ece73914ee25346", "versionType": "git"}, {"status": "affected", "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28", "lessThan": "f72eed9b84fb771019a955908132410a9ba9ea3f", "versionType": "git"}], "programFiles": ["net/core/filter.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.20"}, {"status": "unaffected", "version": "0", "lessThan": "4.20", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.93", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.35", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.12", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/core/filter.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251"}, {"url": "https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2"}, {"url": "https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94"}, {"url": "https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d"}, {"url": "https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1"}, {"url": "https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b"}, {"url": "https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346"}, {"url": "https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sockmap: fix tail fragment offset in bpf_msg_push_data\n\nWhen bpf_msg_push_data() inserts data in the middle of a scatterlist\nentry, it splits the original entry into a left fragment and a right\nfragment.\n\nThe right fragment offset is page-local, but the code advances it with\n`start`, which is the message-global insertion point. For inserts into a\nnon-first SG entry, this over-advances the offset and leaves the split\nlayout inconsistent.\n\nAdvance the right fragment offset by the fragment-local delta,\n`start - offset`, which matches the length removed from the front of the\noriginal entry."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.259", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.210", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.93", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.35", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.12", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "4.20"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:37:21.277Z"}}}, "cveMetadata": {"cveId": "CVE-2026-63926", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:17:57.234Z", "dateReserved": "2026-07-19T07:54:57.021Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-19T14:55:27.154Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sockmap: fix tail fragment offset in bpf_msg_push_data\n\nWhen bpf_msg_push_data() inserts data in the middle of a scatterlist\nentry, it splits the original entry into a left fragment and a right\nfragment.\n\nThe right fragment offset is page-local, but the code advances it with\n`start`, which is the message-global insertion point. For inserts into a\nnon-first SG entry, this over-advances the offset and leaves the split\nlayout inconsistent.\n\nAdvance the right fragment offset by the fragment-local delta,\n`start - offset`, which matches the length removed from the front of the\noriginal entry."}], "id": "CVE-2026-63926", "lastModified": "2026-10-22T15:19:52.250", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63926", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:33:38.098543Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:17:10.913", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-681"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-190"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: bpf: sockmap: fix tail fragment offset in bpf_msg_push_data", "id": "2502414", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502414"}, "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-823", "details": ["A flaw was found in the Linux kernel's sockmap feature. When the `bpf_msg_push_data` function processes data, it incorrectly calculates the offset for data fragments, leading to an inconsistent memory arrangement. This issue could potentially allow a local attacker to cause data corruption or system instability."], "name": "CVE-2026-63926", "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63926\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63926\nhttps://lore.kernel.org/linux-cve-announce/2026071949-CVE-2026-63926-cc75@gregkh/T"], "threat_severity": "Moderate"}

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