CVE-2026-43341

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With bit 22 enabled and the largest schema payload,\nsclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the\nremaining-space check. __ioam6_fill_trace_data() then positions the\nwrite cursor without reserving the schema area but still copies the\n4-byte schema header and the full schema payload, overrunning the trace\nbuffer.\n\nKeep sclen in an unsigned int so the remaining-space check and the write\ncursor calculation both see the full schema length."}], "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 - Inbound IPv6 Hop-by-Hop IOAM packets reach `ipv6_hop_ioam()` and then `ioam6_fill_trace_data()` on an IOAM-enabled interface. In a reasonable IOAM deployment with an active max-size schema, the triggering packet is network-delivered and unauthenticated.\nAC:L - There is no race or timing requirement; the attacker supplies a malformed IOAM trace with bit 22 set and insufficient remaining trace space. The required IOAM/schema configuration is part of the affected deployment scenario, and triggering is otherwise deterministic.\nPR:N - The inbound packet path does not require the sender to hold kernel privileges or authenticate. Although configuring IOAM namespaces/schemas requires administrative capability, a remote attacker can trigger the bug against an already configured IOAM node.\nUI:N - No victim user action is required after the affected IOAM node is configured. Packet receipt alone invokes the vulnerable trace fill path.\nS:U - The corruption occurs within the Linux kernel networking stack and impacts the same kernel security authority. This is not a guest-to-host, IOMMU, or other cross-scope boundary bypass.\nC:H - The bug is a heap/out-of-bounds write from the skb trace area caused by schema length wraparound. Kernel memory corruption can be leveraged to expose sensitive kernel memory or build stronger primitives.\nI:H - The vulnerable path copies the 4-byte schema header and up to 1020 bytes of schema data past the reserved trace buffer. This is a high-impact out-of-bounds write with potential for arbitrary kernel memory corruption/control-flow exploitation.\nA:H - The overflow can corrupt adjacent skb/kernel heap memory and is expected to cause kernel oops, panic, or networking instability. It can be triggered repeatedly with crafted packets in the affected deployment."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ioam6.c"], "versions": [{"version": "8c6f6fa6772696be0c047a711858084b38763728", "lessThan": "d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2", "status": "affected", "versionType": "git"}, {"version": "8c6f6fa6772696be0c047a711858084b38763728", "lessThan": "e96d48b37708d53cbdc47f6f60b0714fc4a5f596", "status": "affected", "versionType": "git"}, {"version": "8c6f6fa6772696be0c047a711858084b38763728", "lessThan": "d1b041080086e91d3733a5438a8c51ad5d3d8e09", "status": "affected", "versionType": "git"}, {"version": "8c6f6fa6772696be0c047a711858084b38763728", "lessThan": "77695a69baca9b99d95fad09fc78c2318736604f", "status": "affected", "versionType": "git"}, {"version": "8c6f6fa6772696be0c047a711858084b38763728", "lessThan": "184d2e9db27c0f76226b5cad16fe29510a5d2280", "status": "affected", "versionType": "git"}, {"version": "8c6f6fa6772696be0c047a711858084b38763728", "lessThan": "d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d", "status": "affected", "versionType": "git"}, {"version": "8c6f6fa6772696be0c047a711858084b38763728", "lessThan": "5e67ba9bb531e1ec6599a82a065dea9040b9ce50", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ioam6.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "5.15", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2"}, {"url": "https://git.kernel.org/stable/c/e96d48b37708d53cbdc47f6f60b0714fc4a5f596"}, {"url": "https://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09"}, {"url": "https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604f"}, {"url": "https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280"}, {"url": "https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d"}, {"url": "https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50"}], "title": "net/ipv6: ioam6: prevent schema length wraparound in trace fill", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43341", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:16:35.670723Z"}}}], "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", "dateUpdated": "2026-10-19T19:16:27.020Z"}}]}}

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With bit 22 enabled and the largest schema payload,\nsclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the\nremaining-space check. __ioam6_fill_trace_data() then positions the\nwrite cursor without reserving the schema area but still copies the\n4-byte schema header and the full schema payload, overrunning the trace\nbuffer.\n\nKeep sclen in an unsigned int so the remaining-space check and the write\ncursor calculation both see the full schema length."}], "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 - Inbound IPv6 Hop-by-Hop IOAM packets reach `ipv6_hop_ioam()` and then `ioam6_fill_trace_data()` on an IOAM-enabled interface. In a reasonable IOAM deployment with an active max-size schema, the triggering packet is network-delivered and unauthenticated.\nAC:L - There is no race or timing requirement; the attacker supplies a malformed IOAM trace with bit 22 set and insufficient remaining trace space. The required IOAM/schema configuration is part of the affected deployment scenario, and triggering is otherwise deterministic.\nPR:N - The inbound packet path does not require the sender to hold kernel privileges or authenticate. Although configuring IOAM namespaces/schemas requires administrative capability, a remote attacker can trigger the bug against an already configured IOAM node.\nUI:N - No victim user action is required after the affected IOAM node is configured. Packet receipt alone invokes the vulnerable trace fill path.\nS:U - The corruption occurs within the Linux kernel networking stack and impacts the same kernel security authority. This is not a guest-to-host, IOMMU, or other cross-scope boundary bypass.\nC:H - The bug is a heap/out-of-bounds write from the skb trace area caused by schema length wraparound. Kernel memory corruption can be leveraged to expose sensitive kernel memory or build stronger primitives.\nI:H - The vulnerable path copies the 4-byte schema header and up to 1020 bytes of schema data past the reserved trace buffer. This is a high-impact out-of-bounds write with potential for arbitrary kernel memory corruption/control-flow exploitation.\nA:H - The overflow can corrupt adjacent skb/kernel heap memory and is expected to cause kernel oops, panic, or networking instability. 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With bit 22 enabled and the largest schema payload,\nsclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the\nremaining-space check. __ioam6_fill_trace_data() then positions the\nwrite cursor without reserving the schema area but still copies the\n4-byte schema header and the full schema payload, overrunning the trace\nbuffer.\n\nKeep sclen in an unsigned int so the remaining-space check and the write\ncursor calculation both see the full schema length."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/ipv6: ioam6: prevenir el desbordamiento de longitud de esquema en el llenado de traza\n\nioam6_fill_trace_data() almacena la contribuci\u00f3n del esquema a la longitud de la traza en un u8. Con el bit 22 habilitado y la carga \u00fatil de esquema m\u00e1s grande, sclen se convierte en 1 + 1020 / 4, se ajusta de 256 a 0, y omite la comprobaci\u00f3n de espacio restante. __ioam6_fill_trace_data() luego posiciona el cursor de escritura sin reservar el \u00e1rea del esquema, pero a\u00fan copia la cabecera de esquema de 4 bytes y la carga \u00fatil completa del esquema, desbordando el b\u00fafer de traza.\n\nMantener sclen en un unsigned int para que la comprobaci\u00f3n de espacio restante y el c\u00e1lculo del cursor de escritura ambos vean la longitud completa del esquema."}], "id": "CVE-2026-43341", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43341", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:16:35.670723Z", "version": "2.0.3"}}]}, "published": "2026-05-08T14:16:44.050", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e96d48b37708d53cbdc47f6f60b0714fc4a5f596"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-190"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net/ipv6: ioam6: prevent schema length wraparound in trace fill", "id": "2468097", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468097"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["A flaw was found in the Linux kernel's IPv6 In-situ Operations, Administration, and Maintenance (IOAM6) trace fill functionality. An integer overflow vulnerability exists in the `ioam6_fill_trace_data()` function, where the schema length calculation can wrap around due to being stored in an 8-bit unsigned integer. This bypasses buffer size checks, leading to a buffer overflow that can result in a denial of service or other memory corruption issues."], "name": "CVE-2026-43341", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43341\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43341\nhttps://lore.kernel.org/linux-cve-announce/2026050824-CVE-2026-43341-7c3e@gregkh/T"], "threat_severity": "Important"}

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