268 lines
14 KiB
JSON
268 lines
14 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-2026-31675",
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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": "2026-03-09T15:48:24.130Z",
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"datePublished": "2026-04-25T08:46:51.184Z",
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"dateUpdated": "2026-10-30T12:24:30.924Z"
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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": "2026-10-30T12:24:30.924Z"
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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/sched: sch_netem: fix out-of-bounds access in packet corruption\n\nIn netem_enqueue(), the packet corruption logic uses\nget_random_u32_below(skb_headlen(skb)) to select an index for\nmodifying skb->data. When an AF_PACKET TX_RING sends fully non-linear\npackets over an IPIP tunnel, skb_headlen(skb) evaluates to 0.\n\nPassing 0 to get_random_u32_below() takes the variable-ceil slow path\nwhich returns an unconstrained 32-bit random integer. Using this\nunconstrained value as an offset into skb->data results in an\nout-of-bounds memory access.\n\nFix this by verifying skb_headlen(skb) is non-zero before attempting\nto corrupt the linear data area. Fully non-linear packets will silently\nbypass the corruption logic."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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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:L - Triggering requires local kernel interfaces: configuring a `netem` qdisc via rtnetlink and sending crafted AF_PACKET TX_RING traffic over an IPIP tunnel. This is not directly reachable by unauthenticated remote packets.\nAC:L - The attacker controls the qdisc corruption setting and the fully non-linear skb construction path, with no race or victim state required. The corrupt probability can be configured to make the vulnerable access occur reliably.\nPR:L - The path requires `CAP_NET_ADMIN` for traffic control and `CAP_NET_RAW` for AF_PACKET, but both are obtainable inside attacker-created user/network namespaces on systems permitting unprivileged user namespaces. Therefore this is low privilege rather than real init-namespace root.\nUI:N - No victim action is needed once the local attacker can issue the relevant netlink and socket syscalls. The attacker triggers the enqueue path directly.\nS:U - The corruption occurs within the kernel networking/qdisc subsystem and impacts the same kernel security authority. It is a standard local kernel compromise scenario, not a VM or hardware boundary escape.\nC:H - The bug is an out-of-bounds kernel memory read-modify-write through an unconstrained offset from `skb->data`. As kernel memory corruption, successful exploitation can plausibly yield arbitrary kernel memory disclosure.\nI:H - The vulnerable operation flips a bit at an out-of-bounds kernel address, giving a kernel memory corruption primitive. Under the required overestimation rule, this supports potential control-flow hijack or privilege escalation.\nA:H - The unconstrained out-of-bounds kernel access can fault or corrupt critical kernel memory. A local attacker can repeatedly trigger it, making kernel oops/panic or system instability high impact."
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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/sched/sch_netem.c"
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],
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"versions": [
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{
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"version": "c865e5d99e25a171e8262fc0f7ba608568633c64",
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"lessThan": "8d3de49c22ec0ec8f7199cc7e2b0559de7306f87",
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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": "c865e5d99e25a171e8262fc0f7ba608568633c64",
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"lessThan": "a14b56863348686dd0387eea8ce66b85cf455908",
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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": "c865e5d99e25a171e8262fc0f7ba608568633c64",
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"lessThan": "13a66ca1e235d4bcd53d12d4c68490cad7f8e46f",
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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": "c865e5d99e25a171e8262fc0f7ba608568633c64",
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"lessThan": "3a2999704ac36cfb4041fed3652d26a3373e8d12",
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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": "c865e5d99e25a171e8262fc0f7ba608568633c64",
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"lessThan": "4fd258e281fa8bc15e9ce2c7691941537e9258ad",
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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": "c865e5d99e25a171e8262fc0f7ba608568633c64",
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"lessThan": "d64cb81dcbd54927515a7f65e5e24affdc73c14b",
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"status": "affected",
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"versionType": "git"
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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/sched/sch_netem.c"
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],
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"versions": [
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{
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"version": "2.6.16",
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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": "2.6.16",
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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": "6.1.191",
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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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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.16",
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"versionEndExcluding": "6.1.191"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.16",
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"versionEndExcluding": "6.6.134"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.16",
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"versionEndExcluding": "6.12.81"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.16",
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"versionEndExcluding": "6.18.22"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.16",
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"versionEndExcluding": "6.19.12"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.16",
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"versionEndExcluding": "7.0"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8d3de49c22ec0ec8f7199cc7e2b0559de7306f87"
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},
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{
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"url": "https://git.kernel.org/stable/c/a14b56863348686dd0387eea8ce66b85cf455908"
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},
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{
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"url": "https://git.kernel.org/stable/c/13a66ca1e235d4bcd53d12d4c68490cad7f8e46f"
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},
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{
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"url": "https://git.kernel.org/stable/c/3a2999704ac36cfb4041fed3652d26a3373e8d12"
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},
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{
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"url": "https://git.kernel.org/stable/c/4fd258e281fa8bc15e9ce2c7691941537e9258ad"
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},
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{
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"url": "https://git.kernel.org/stable/c/d64cb81dcbd54927515a7f65e5e24affdc73c14b"
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}
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],
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"title": "net/sched: sch_netem: fix out-of-bounds access in packet corruption",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-31675",
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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": "no"
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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": "2026-10-16T15:12:12.570875Z"
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}
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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-787",
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"description": "CWE-787 Out-of-bounds Write"
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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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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T18:56:03.858Z"
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}
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}
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]
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}
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} |