CVE-2026-46120 (GCVE-0-2026-46120)
Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-08-05 12:29
VLAI
EPSS
VEX
Title
ip6_gre: Use cached t->net in ip6erspan_changelink().
Summary
In the Linux kernel, the following vulnerability has been resolved:
ip6_gre: Use cached t->net in ip6erspan_changelink().
After commit 5e72ce3e3980 ("net: ipv6: Use link netns in newlink() of
rtnl_link_ops"), ip6erspan_newlink() correctly resolves the per-netns
ip6gre hash via link_net. ip6erspan_changelink() was not converted in
that series and still uses dev_net(dev), which diverges from the
device's creation netns after IFLA_NET_NS_FD migration.
This re-inserts the tunnel into the wrong per-netns hash. The
original netns keeps a stale entry. When that netns is later
destroyed, ip6gre_exit_rtnl_net() walks the stale entry, producing a
slab-use-after-free reported by KASAN, followed by a kernel BUG at
net/core/dev.c (LIST_POISON1) in unregister_netdevice_many_notify().
Reachable from an unprivileged user namespace (unshare --user
--map-root-user --net).
ip6gre_changelink() earlier in the same file already uses the cached
t->net; only ip6erspan_changelink() has the wrong shape.
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
2d665034f239412927b1e71329f20f001c92da09 , < 7bd0f2b162b426b343a114e1b329f0d8d14fdc6e
(git)
Affected: 2d665034f239412927b1e71329f20f001c92da09 , < 01b71ff2857d3598337de11e7840a8e3ff21553c (git) Affected: 2d665034f239412927b1e71329f20f001c92da09 , < 0fcf6731706f73494245a9c0d64f93bebf95bb51 (git) Affected: 2d665034f239412927b1e71329f20f001c92da09 , < eca62bb0569de4d43a4dac06a2092a9d4ca1d702 (git) Affected: 2d665034f239412927b1e71329f20f001c92da09 , < 311fdd26eb4443d43b909cc67a10f3a5fd1b21b2 (git) Affected: 2d665034f239412927b1e71329f20f001c92da09 , < e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82 (git) Affected: 2d665034f239412927b1e71329f20f001c92da09 , < cf7fc624329e76c6394653d12353e1d033adea91 (git) Affected: 2d665034f239412927b1e71329f20f001c92da09 , < 1d324c2f43f70c965f25c58cc3611c779adbe47e (git) Affected: c6d72628352c949629af619b77b042e0fb5245e7 (git) Affected: 4.16.12 , < 4.17 (semver) |
guessed | |
| Linux | Linux |
Affected:
4.17
Unaffected: 0 , < 4.17 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
{
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{
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}
]
}
],
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_gre: Use cached t-\u003enet in ip6erspan_changelink().\n\nAfter commit 5e72ce3e3980 (\"net: ipv6: Use link netns in newlink() of\nrtnl_link_ops\"), ip6erspan_newlink() correctly resolves the per-netns\nip6gre hash via link_net. ip6erspan_changelink() was not converted in\nthat series and still uses dev_net(dev), which diverges from the\ndevice\u0027s creation netns after IFLA_NET_NS_FD migration.\n\nThis re-inserts the tunnel into the wrong per-netns hash. The\noriginal netns keeps a stale entry. When that netns is later\ndestroyed, ip6gre_exit_rtnl_net() walks the stale entry, producing a\nslab-use-after-free reported by KASAN, followed by a kernel BUG at\nnet/core/dev.c (LIST_POISON1) in unregister_netdevice_many_notify().\n\nReachable from an unprivileged user namespace (unshare --user\n--map-root-user --net).\n\nip6gre_changelink() earlier in the same file already uses the cached\nt-\u003enet; only ip6erspan_changelink() has the wrong shape."
}
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"version": "3.1"
},
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{
"lang": "en",
"value": "AV:L - The vulnerable code is reached only via local netlink operations (RTM_NEWLINK changelink, IFLA_NET_NS_FD device migration, and netns teardown), not from any remote packet path; this is a local attack surface.\nAC:L - The attacker deterministically performs every step (create erspan tunnel, migrate it to another netns, issue changelink, destroy the original netns) with no race or memory-layout condition outside their control.\nPR:L - The path nominally needs CAP_NET_ADMIN, but the fix commit explicitly states it is reachable from an unprivileged user namespace via `unshare --user --map-root-user --net`, so only a basic local user is required.\nUI:N - The entire sequence is driven by the attacker\u0027s own process; no action by any other user is needed.\nS:U - The use-after-free and resulting crash are confined to the kernel\u0027s own structures within the same security authority; no boundary such as VM/IOMMU is crossed.\nC:H - The stale hash entry yields a slab-use-after-free on the ip6_tnl/net_device object; reallocating the freed slab with attacker-controlled data enables reading kernel memory contents, treated as High.\nI:H - The use-after-free permits heap grooming and writes through the dangling pointer (e.g., the rcu list manipulation in unregister), providing an arbitrary-write/control-flow primitive, scored High.\nA:H - Exploitation reliably produces a KASAN slab-use-after-free followed by a kernel BUG (LIST_POISON1) in unregister_netdevice_many_notify(), crashing the kernel."
}
]
}
],
"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"url": "https://git.kernel.org/stable/c/7bd0f2b162b426b343a114e1b329f0d8d14fdc6e"
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},
{
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},
{
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{
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{
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},
{
"url": "https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e"
}
],
"title": "ip6_gre: Use cached t-\u003enet in ip6erspan_changelink().",
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"cveId": "CVE-2026-46120",
"datePublished": "2026-05-28T09:35:35.385Z",
"dateReserved": "2026-05-13T15:03:33.098Z",
"dateUpdated": "2026-08-05T12:29:51.685Z",
"state": "PUBLISHED"
},
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"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-46120",
"date": "2026-09-13",
"epss": "0.00126",
"percentile": "0.02555"
},
"microsoft_vex": {
"current_release_date": "2026-06-09T14:42:22.000Z",
"cve": "CVE-2026-46120",
"id": "msrc_CVE-2026-46120",
"initial_release_date": "2026-05-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "ip6_gre: Use cached t-\u003enet in ip6erspan_changelink().",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46120.json",
"version": "3"
},
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When that netns is later\\ndestroyed, ip6gre_exit_rtnl_net() walks the stale entry, producing a\\nslab-use-after-free reported by KASAN, followed by a kernel BUG at\\nnet/core/dev.c (LIST_POISON1) in unregister_netdevice_many_notify().\\n\\nReachable from an unprivileged user namespace (unshare --user\\n--map-root-user --net).\\n\\nip6gre_changelink() earlier in the same file already uses the cached\\nt-\u003enet; only ip6erspan_changelink() has the wrong shape.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/ip6_gre.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2d665034f239412927b1e71329f20f001c92da09\",\"lessThan\":\"7bd0f2b162b426b343a114e1b329f0d8d14fdc6e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d665034f239412927b1e71329f20f001c92da09\",\"lessThan\":\"01b71ff2857d3598337de11e7840a8e3ff21553c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d665034f239412927b1e71329f20f001c92da09\",\"lessThan\":\"0fcf6731706f73494245a9c0d64f93bebf95bb51\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d665034f239412927b1e71329f20f001c92da09\",\"lessThan\":\"eca62bb0569de4d43a4dac06a2092a9d4ca1d702\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d665034f239412927b1e71329f20f001c92da09\",\"lessThan\":\"311fdd26eb4443d43b909cc67a10f3a5fd1b21b2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d665034f239412927b1e71329f20f001c92da09\",\"lessThan\":\"e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d665034f239412927b1e71329f20f001c92da09\",\"lessThan\":\"cf7fc624329e76c6394653d12353e1d033adea91\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d665034f239412927b1e71329f20f001c92da09\",\"lessThan\":\"1d324c2f43f70c965f25c58cc3611c779adbe47e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6d72628352c949629af619b77b042e0fb5245e7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4.16.12\",\"lessThan\":\"4.17\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/ip6_gre.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.88\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.30\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.7\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.16.12\",\"versionEndExcluding\":\"4.17\",\"matchCriteriaId\":\"1E372F14-2300-4733-AA3A-B7DD0540E9B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.17.1\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"6AE54F96-C194-40DB-B1DA-5B763A902041\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.88\",\"matchCriteriaId\":\"5AFBE0EC-CCDF-4207-AE92-ABF958125CA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.30\",\"matchCriteriaId\":\"BF39AE08-AE6D-4410-8FBE-76F6BF5BF55B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.7\",\"matchCriteriaId\":\"D0893CA7-9AE6-4DFE-AC75-48967D73AD8E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.17:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"3F438846-FE97-43DC-A655-B5EF8DED552E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.17:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"A665D441-505B-4569-9EBD-96EFC9DA73BC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B1EF7059-E670-45F4-B422-54C40FA86390\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D38F0BF-A728-4133-A358-D44A2F7EE6D6\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01b71ff2857d3598337de11e7840a8e3ff21553c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0fcf6731706f73494245a9c0d64f93bebf95bb51\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7bd0f2b162b426b343a114e1b329f0d8d14fdc6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-09T01:06:27+00:00",
"cve": "CVE-2026-46120",
"id": "CVE-2026-46120",
"initial_release_date": "2026-05-28T00:00:00+00:00",
"product_status:fixed": "1119",
"product_status:known_affected": "22",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ip6_gre: Use cached t-\u003enet in ip6erspan_changelink()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46120.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-08-31T16:56:12Z",
"cve": "CVE-2026-46120",
"id": "CVE-2026-46120",
"initial_release_date": "2026-05-29T01:16:52Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "439",
"product_status:known_not_affected": "125",
"product_status:recommended": "742",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-46120",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46120.json",
"version": "28"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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