289 lines
15 KiB
JSON
289 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-43341",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-01T14:12:56.003Z",
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"datePublished": "2026-05-08T13:37:19.256Z",
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"dateUpdated": "2026-10-19T19:16:27.020Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:27:21.749Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/ipv6/ioam6.c"
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],
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"versions": [
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{
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"version": "8c6f6fa6772696be0c047a711858084b38763728",
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"lessThan": "d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8c6f6fa6772696be0c047a711858084b38763728",
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"lessThan": "e96d48b37708d53cbdc47f6f60b0714fc4a5f596",
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"status": "affected",
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"lessThan": "d1b041080086e91d3733a5438a8c51ad5d3d8e09",
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"status": "affected",
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"status": "affected",
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"versionType": "git"
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"lessThan": "184d2e9db27c0f76226b5cad16fe29510a5d2280",
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"status": "affected",
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"versionType": "git"
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"version": "8c6f6fa6772696be0c047a711858084b38763728",
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"lessThan": "d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d",
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"status": "affected",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/ipv6/ioam6.c"
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],
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"versions": [
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{
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"version": "5.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.210",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.168",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.134",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.81",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.22",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.19.12",
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"lessThanOrEqual": "6.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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"url": "https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d"
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}
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],
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"title": "net/ipv6: ioam6: prevent schema length wraparound in trace fill",
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-43341",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:16:35.670723Z"
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-190",
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"description": "CWE-190 Integer Overflow or Wraparound"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T19:16:27.020Z"
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} |