306 lines
16 KiB
JSON
306 lines
16 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-2026-80978",
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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": "2026-08-26T14:34:25.811Z",
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"datePublished": "2026-09-11T19:42:39.496Z",
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"dateUpdated": "2026-10-19T08:46:02.787Z"
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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": "2026-10-19T08:46:02.787Z"
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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: cap advertised IP tunnel headroom\n\nIP tunnel devices derive their advertised needed_headroom from lower\noutput devices. A stack of user-created devices can make the derived\nvalue larger than the 16-bit skb header offsets can represent. Once IP\noutput reserves it, skb head expansion can wrap those offsets.\n\nThe runtime transmit path already caps a growing needed_headroom at 512.\nApply the same cap when tunnel configuration publishes needed_headroom\nderived from a lower output device.\n\nCapping the advertised value is safe: IP tunnel transmit still expands\nthe skb when a packet needs more headroom. A nonsensical stacked\nconfiguration can therefore incur an extra reallocation, but it cannot\npublish an unbounded reservation to upper layers."
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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 the wrap requires locally creating a namespace stack of IP tunnel devices (ipip/gre/sit/ip6tnl via rtnetlink or SIOCADDTUNNEL) so bind/link-config can copy an uncapped needed_headroom, then sending packets through that stack. A remote peer cannot build that topology, so the attacker-controlled path is local.\nAC:L - The attacker fully controls tunnel creation, IFLA_IPTUN_LINK/parms.link stacking (or a netkit lower device with a large IFLA_NETKIT_HEADROOM), and the subsequent transmit. Each bind copies lower needed_headroom plus t_hlen until LL_RESERVED_SPACE exceeds 16-bit skb offsets; no race or uninfluenced victim state is required.\nPR:L - Creating and binding these tunnels needs CAP_NET_ADMIN, but rtnetlink uses netlink_ns_capable()/sk_ns_capable() against net->user_ns and ip_tunnel_ctl uses ns_capable(net->user_ns, CAP_NET_ADMIN), so an unprivileged user obtains it with unshare -Urn. Fallback tunl0/ip6tnl0 devices are created in every netns by default.\nUI:N - The attacker creates the stacked tunnels and generates the traffic that drives IP output/skb_cow_head; no other user or administrator action is required.\nS:U - The resulting skb header-offset wrap corrupts kernel heap in the same OS security authority. This is standard in-kernel privilege escalation, not a VM, IOMMU, or hypervisor boundary crossing.\nC:H - After pskb_expand_head adds a >64K nhead, u16 network_header wraps so skb->data points outside skb->head. Neighbour/flow-dissect paths then __skb_pull/read with a negative offset, producing the same unbounded KASAN use-after-free/OOB read as CVE-2024-26804/CVE-2025-40173.\nI:H - Post-wrap, skb_push/dev_hard_header and iptunnel_xmit/ip6_tnl_xmit write outer IP/GRE headers at the corrupted skb->data, giving an out-of-bounds write into unrelated kernel heap that can be used for control-flow hijacking.\nA:H - The wrapped offsets and subsequent out-of-bounds accesses reliably oops/panic (KASAN, skb_under_panic, or unmapped dereference), matching the confirmed crash impact of the earlier unbounded tunnel-headroom bugs."
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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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"include/net/ip_tunnels.h",
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"net/ipv4/ip_tunnel.c",
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"net/ipv6/ip6_gre.c",
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"net/ipv6/ip6_tunnel.c",
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"net/ipv6/sit.c"
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],
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"versions": [
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{
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"version": "1a37e412a0225fcba5587f24c0dfc7636efc8b69",
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"lessThan": "fb889a619723032140f5d983a3a34d25a5a2bed4",
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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": "1a37e412a0225fcba5587f24c0dfc7636efc8b69",
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"lessThan": "b160422f8103574425e2834130e169d84c94fa1d",
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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": "1a37e412a0225fcba5587f24c0dfc7636efc8b69",
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"lessThan": "d36e75f5669140b66515ad3a176ca6337bd80a5e",
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"status": "affected",
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},
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{
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"status": "affected",
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},
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{
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"version": "1a37e412a0225fcba5587f24c0dfc7636efc8b69",
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"lessThan": "bc4e05ae66c9797a0972ac44326e69c5305e0020",
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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": "1a37e412a0225fcba5587f24c0dfc7636efc8b69",
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"lessThan": "af0ee8f04bea22cdb331fa3509e17f81b48938ad",
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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": "1a37e412a0225fcba5587f24c0dfc7636efc8b69",
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"lessThan": "9144f2c53a04465a6878172b523f640313c5559e",
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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": "1a37e412a0225fcba5587f24c0dfc7636efc8b69",
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"lessThan": "6b222adeb9340306e2ff97127c76117abb9b3df8",
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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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"include/net/ip_tunnels.h",
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"net/ipv4/ip_tunnel.c",
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"net/ipv6/ip6_gre.c",
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"net/ipv6/ip6_tunnel.c",
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"net/ipv6/sit.c"
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],
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"versions": [
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{
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"version": "3.11",
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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": "3.11",
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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": "5.10.270",
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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": "5.15.221",
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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": "6.1.188",
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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": "6.6.157",
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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": "6.12.109",
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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": "6.18.50",
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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": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "3.11",
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"versionEndExcluding": "5.10.270"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/fb889a619723032140f5d983a3a34d25a5a2bed4"
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},
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{
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"url": "https://git.kernel.org/stable/c/b160422f8103574425e2834130e169d84c94fa1d"
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},
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{
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"url": "https://git.kernel.org/stable/c/d36e75f5669140b66515ad3a176ca6337bd80a5e"
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},
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{
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"url": "https://git.kernel.org/stable/c/84783961cb8bdb36b4f41a02ce43aafc6d52b176"
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},
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{
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"url": "https://git.kernel.org/stable/c/bc4e05ae66c9797a0972ac44326e69c5305e0020"
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},
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{
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"url": "https://git.kernel.org/stable/c/af0ee8f04bea22cdb331fa3509e17f81b48938ad"
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},
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{
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"url": "https://git.kernel.org/stable/c/9144f2c53a04465a6878172b523f640313c5559e"
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},
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{
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"url": "https://git.kernel.org/stable/c/6b222adeb9340306e2ff97127c76117abb9b3df8"
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}
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],
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"title": "net: cap advertised IP tunnel headroom",
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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-2026-80978",
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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": "2026-10-16T19:21:45.426777Z"
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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": "2026-10-16T19:26:37.217Z"
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}
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}
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]
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}
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} |