CVE-2026-46120

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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->net; only ip6erspan_changelink() has the wrong shape."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"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's own process; no action by any other user is needed.\nS:U - The use-after-free and resulting crash are confined to the kernel's 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ip6_gre.c"], "versions": [{"version": "2d665034f239412927b1e71329f20f001c92da09", "lessThan": "7bd0f2b162b426b343a114e1b329f0d8d14fdc6e", "status": "affected", "versionType": "git"}, {"version": "2d665034f239412927b1e71329f20f001c92da09", "lessThan": "01b71ff2857d3598337de11e7840a8e3ff21553c", "status": "affected", "versionType": "git"}, {"version": "2d665034f239412927b1e71329f20f001c92da09", "lessThan": "0fcf6731706f73494245a9c0d64f93bebf95bb51", "status": "affected", "versionType": "git"}, {"version": "2d665034f239412927b1e71329f20f001c92da09", "lessThan": "eca62bb0569de4d43a4dac06a2092a9d4ca1d702", "status": "affected", "versionType": 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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's own process; no action by any other user is needed.\nS:U - The use-after-free and resulting crash are confined to the kernel's 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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "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"}], "programFiles": ["net/ipv6/ip6_gre.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.17"}, {"status": "unaffected", "version": "0", "lessThan": "4.17", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.140", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.88", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.30", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.7", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/ip6_gre.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/7bd0f2b162b426b343a114e1b329f0d8d14fdc6e"}, {"url": "https://git.kernel.org/stable/c/01b71ff2857d3598337de11e7840a8e3ff21553c"}, {"url": "https://git.kernel.org/stable/c/0fcf6731706f73494245a9c0d64f93bebf95bb51"}, {"url": "https://git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702"}, {"url": "https://git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2"}, {"url": "https://git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82"}, {"url": "https://git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91"}, {"url": "https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_gre: Use cached t->net 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's 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. 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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->net; only ip6erspan_changelink() has the wrong shape."}], "id": "CVE-2026-46120", "lastModified": "2026-10-19T20:18:33.000", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46120", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:20:01.834232Z", "version": "2.0.3"}}]}, "published": "2026-05-28T10:16:27.497", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "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": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ip6_gre: Use cached t->net in ip6erspan_changelink()", "id": "2482614", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482614"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-763", "details": ["A flaw was found in the Linux kernel's ip6_gre module. An unprivileged user could exploit this vulnerability by migrating a network device, causing the ip6erspan_changelink() function to incorrectly handle network namespace references. This error leads to a use-after-free condition when the original network namespace is destroyed, potentially resulting in a kernel bug and system instability or denial of service."], "name": "CVE-2026-46120", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46120\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46120\nhttps://lore.kernel.org/linux-cve-announce/2026052815-CVE-2026-46120-1a01@gregkh/T"], "threat_severity": "Important"}

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