310 lines
17 KiB
JSON
310 lines
17 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-2026-68127",
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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": "2026-07-30T09:28:09.369Z",
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"datePublished": "2026-08-10T11:58:48.489Z",
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"dateUpdated": "2026-10-19T20:58:52.243Z"
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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": "2026-08-19T16:29:41.771Z"
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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\nila: reload IPv6 header after pskb_may_pull in checksum adjust\n\nila_csum_adjust_transport() caches ip6h = ipv6_hdr(skb) before calling\npskb_may_pull(). On a non-linear skb whose transport header sits in a page\nfragment, pskb_may_pull() can call __pskb_pull_tail() / pskb_expand_head()\nand free the old skb head, leaving ip6h dangling; the following\nget_csum_diff(ip6h, p) then reads freed memory. ila_update_ipv6_locator()\nuses ip6h (and the iaddr derived from it) again after the csum-adjust\ncall and additionally writes the new locator through that pointer.\n\nImpact: a remote IPv6 packet routed through a configured ILA\ncsum-adjust-transport route or receive-side mapping triggers a\nslab-use-after-free in ila_update_ipv6_locator() (KASAN). The route or\nmapping requires CAP_NET_ADMIN to configure, but trigger packets are\nunauthenticated once it exists.\n\nReload ip6h after each pskb_may_pull() in ila_csum_adjust_transport()\nbefore the csum-diff read. In ila_update_ipv6_locator() only the\nILA_CSUM_ADJUST_TRANSPORT case pulls the skb, so reload ip6h and iaddr in\nthat case alone before the destination-address write; the neutral-map\nmodes never pull and keep their cached pointers."
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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 - The bug is reached from ipv6_rcv() through NF_INET_PRE_ROUTING (ila_nf_input) or IPv6 routing/LWT input/output when remote IPv6 packets matching a configured ILA csum-adjust-transport mapping or route are processed; no local syscall is required on internet-facing routers, gateways, or NVO3/overlay hosts.\nAC:L - Once ILA csum-adjust-transport is configured, a remote attacker can reliably send IPv6 TCP/UDP/ICMPv6 packets whose transport headers live in skb page fragments so pskb_may_pull() reallocates the head; they control packet layout and can retry without races or uncontrollable memory layout.\nPR:N - Trigger packets are processed unauthenticated on the network datapath; although ILA routes/mappings require CAP_NET_ADMIN to install, that is operator infrastructure (also obtainable in a user netns), not a privilege the remote attacker needs to send the malformed IPv6 packets that hit ila_update_ipv6_locator().\nUI:N - No victim user action is required beyond normal IPv6 packet delivery; exploitation is fully automated once the affected ILA configuration exists and the attacker sends crafted packets to the host.\nS:U - The slab use-after-free corrupts kernel packet-processing memory within the host kernel security authority; it is not a VM escape, container breakout, or IOMMU/DMA boundary bypass.\nC:H - ila_csum_adjust_transport() reads the cached IPv6 header via get_csum_diff(ip6h, p) after pskb_may_pull() frees the old skb head, causing a slab use-after-free read of freed memory that can disclose kernel heap contents.\nI:H - ila_update_ipv6_locator() then writes iaddr->loc = p->locator through the same stale iaddr pointer derived from the freed header, giving a slab use-after-free write primitive that can be leveraged for arbitrary memory corruption and control-flow hijacking.\nA:H - The freed skb-head slab use-after-free was reproduced under KASAN and can cause kernel oops/panic during IPv6 receive/forwarding; even unsuccessful exploitation typically crashes or destabilizes the host."
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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/ila/ila_common.c"
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],
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"versions": [
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{
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"version": "33f11d16142b06588eedfc1dd8cf93790979a712",
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"lessThan": "e451a904606c571f731ef7a06b3398619dce5300",
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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": "33f11d16142b06588eedfc1dd8cf93790979a712",
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"lessThan": "1eadcb43893b897ade85ac5bf5c618054bc3c655",
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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": "33f11d16142b06588eedfc1dd8cf93790979a712",
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"lessThan": "ba353caafb06ccee57b78d3254e3cebf1dea4a93",
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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": "33f11d16142b06588eedfc1dd8cf93790979a712",
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"lessThan": "896a9512d0d83c2a4b357e5585b7b62a8e3f95c1",
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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": "33f11d16142b06588eedfc1dd8cf93790979a712",
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"lessThan": "7097a0280b178237265681be66d1bef11d15894b",
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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": "33f11d16142b06588eedfc1dd8cf93790979a712",
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"lessThan": "472aba2603ca74c4f7722cb0c0296942b0776b8d",
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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": "33f11d16142b06588eedfc1dd8cf93790979a712",
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"lessThan": "c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc",
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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": "33f11d16142b06588eedfc1dd8cf93790979a712",
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"lessThan": "92d3817649df2b0b6a008a686c8275c88d7ef594",
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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/ipv6/ila/ila_common.c"
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],
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"versions": [
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{
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"version": "4.5",
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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": "4.5",
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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": "5.10.265",
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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": "5.15.216",
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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": "6.1.183",
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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": "6.6.148",
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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": "6.12.101",
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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": "6.18.42",
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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": "7.1.6",
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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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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.5",
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"versionEndExcluding": "5.10.265"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e451a904606c571f731ef7a06b3398619dce5300"
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},
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{
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"url": "https://git.kernel.org/stable/c/1eadcb43893b897ade85ac5bf5c618054bc3c655"
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},
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{
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"url": "https://git.kernel.org/stable/c/ba353caafb06ccee57b78d3254e3cebf1dea4a93"
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},
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{
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"url": "https://git.kernel.org/stable/c/896a9512d0d83c2a4b357e5585b7b62a8e3f95c1"
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},
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{
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"url": "https://git.kernel.org/stable/c/7097a0280b178237265681be66d1bef11d15894b"
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},
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{
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"url": "https://git.kernel.org/stable/c/472aba2603ca74c4f7722cb0c0296942b0776b8d"
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},
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{
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"url": "https://git.kernel.org/stable/c/c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc"
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},
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{
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"url": "https://git.kernel.org/stable/c/92d3817649df2b0b6a008a686c8275c88d7ef594"
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}
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],
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"title": "ila: reload IPv6 header after pskb_may_pull in checksum adjust",
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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-2026-68127",
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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": "2026-10-16T15:44:18.440814Z"
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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-416",
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"description": "CWE-416 Use After Free"
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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": "2026-10-19T20:58:52.243Z"
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}
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}
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]
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}
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} |