298 lines
15 KiB
JSON
298 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-2026-72350",
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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": "2026-08-09T03:40:39.921Z",
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"datePublished": "2026-08-15T05:55:53.532Z",
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"dateUpdated": "2026-10-16T18:55:19.841Z"
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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": "2026-08-17T05:43:07.758Z"
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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\nnetfilter: xt_u32: reject invalid shift counts\n\nu32_match_it() executes rule-supplied shift operands on a 32-bit\nvalue. A malformed u32 rule can provide a shift count of 32 or more,\ntriggering an undefined shift out-of-bounds during packet evaluation.\n\nValidate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in\nu32_mt_checkentry() and reject malformed rules before they reach the\npacket path."
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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 - Malicious xt_u32 match rules are installed via IPT_SO_SET_REPLACE setsockopt or nftables NFNetlink (nft_compat match); per kernel CNA guidance netfilter/xtables rule setup is Local even though installed rules evaluate on ingress/egress packets through ipt_do_table.\nAC:L - The attacker fully controls XT_U32_LEFTSH/RIGHTSH shift operands (>=32) in matchinfo and can send triggering packets through the hooked netfilter chain; no race or uncontrollable victim state is required.\nPR:L - Installing xt_u32 iptables/nftables rules requires CAP_NET_ADMIN, obtainable by unprivileged users in user/network namespaces via unshare -Urn; ip_tables.c and nfnetlink enforce ns_capable/netlink_net_capable against the namespace user_ns.\nUI:N - The attacker installs the malicious u32 match rule and generates matching traffic in their namespace; no separate victim action (opening files, mounting media, clicking links) is needed.\nS:U - Undefined shift during xt_u32 packet matching and any resulting kernel crash remain within the host kernel security authority; this is standard local kernel compromise, not a VM escape or sandbox boundary crossing.\nC:H - Undefined-behavior shifts on packet-derived u32 values corrupt val and @ offset accumulation, driving attacker-influenced skb_copy_bits reads at unintended offsets; per CNA guidance exploitable kernel memory-unsafe arithmetic warrants High confidentiality.\nI:H - Invalid shift counts corrupt val/at control flow in the u32_match_it hot path; C11 undefined behavior in kernel netfilter matching is exploitable for integrity compromise and potential code execution per CNA memory-corruption guidance.\nA:H - Evaluating a malformed xt_u32 rule with shift>=32 triggers undefined shift-out-of-bounds during packet matching; vulnerable kernels also BUG() on skb_copy_bits failure, provoking kernel panic/oops during rule evaluation."
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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/netfilter/xt_u32.c"
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],
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"versions": [
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{
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"version": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
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"lessThan": "ca7c92d9701249e6daf132087756a88cbf2bb2a3",
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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": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
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"lessThan": "b33b44250d57ab0e5a1e2571b5285fb0d0a7f382",
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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": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
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"lessThan": "728f479dc0447ae7eaef87926ff49142e415a811",
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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": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
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"lessThan": "0a8b7a6d763775709c601f584e709ae48bcc000a",
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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": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
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"lessThan": "cce42014415cecd98aa49b3950e7b02ee7c81268",
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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": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
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"lessThan": "a597a722fb71a534138c20359b655726622b5f17",
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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": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
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"lessThan": "00d034fe8230dfc5832fe011ff2d81c1a2cc7a29",
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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": "1b50b8a371e90a5e110f466e4ac02cf6b5f681de",
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"lessThan": "64cdf7d30ac18e43df6c48004435febb965809a8",
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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/netfilter/xt_u32.c"
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],
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"versions": [
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{
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"version": "2.6.23",
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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": "2.6.23",
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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": "5.10.261",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.212",
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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": "6.1.178",
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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": "6.6.145",
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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": "6.12.97",
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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": "6.18.40",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.23",
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"versionEndExcluding": "5.10.261"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/ca7c92d9701249e6daf132087756a88cbf2bb2a3"
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},
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{
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"url": "https://git.kernel.org/stable/c/b33b44250d57ab0e5a1e2571b5285fb0d0a7f382"
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},
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{
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"url": "https://git.kernel.org/stable/c/728f479dc0447ae7eaef87926ff49142e415a811"
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},
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{
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"url": "https://git.kernel.org/stable/c/0a8b7a6d763775709c601f584e709ae48bcc000a"
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},
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{
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"url": "https://git.kernel.org/stable/c/cce42014415cecd98aa49b3950e7b02ee7c81268"
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},
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{
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"url": "https://git.kernel.org/stable/c/a597a722fb71a534138c20359b655726622b5f17"
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},
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{
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"url": "https://git.kernel.org/stable/c/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29"
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},
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{
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"url": "https://git.kernel.org/stable/c/64cdf7d30ac18e43df6c48004435febb965809a8"
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}
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],
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"title": "netfilter: xt_u32: reject invalid shift counts",
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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-2026-72350",
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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": "2026-10-16T18:47:46.235964Z"
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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": "2026-10-16T18:55:19.841Z"
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}
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}
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]
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}
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} |