{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43341", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.003Z", "datePublished": "2026-05-08T13:37:19.256Z", "dateUpdated": "2026-08-05T12:27:21.749Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:27:21.749Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ipv6: ioam6: prevent schema length wraparound in trace fill\n\nioam6_fill_trace_data() stores the schema contribution to the trace\nlength in a u8. 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" } } } }