CVE-2026-80664

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80664", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.781Z", "datePublished": "2026-08-28T06:49:07.478Z", "dateUpdated": "2026-10-16T19:26:32.191Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:21:50.580Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_nat: reject unsupported target families\n\nxt_nat SNAT and DNAT target handlers assume IP-family conntrack state\nis present and can dereference a NULL pointer when instantiated from an\nunsupported family through nft_compat. A bridge-family compat rule can\ntherefore trigger a NULL-dereference in nf_nat_setup_info().\n\nReject non-IP families in xt_nat_checkentry() so unsupported targets\ncannot be installed. Keep NFPROTO_INET allowed for valid inet NAT\ncompat users and leave the runtime fast path unchanged.\n\n[ The crash was fixed via\n 9dbba7e694ec (\"netfilter: nft_compat: ebtables emulation must reject non-bridge targets\"),\n so this patch is no longer critical.\n Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra\n family check is a good idea in any case. ]"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires installing a bridge-family nft_compat SNAT/DNAT rule via NETLINK_NETFILTER (nftables netlink), a local syscall path; although matching bridge traffic can trigger evaluation, the vulnerable rule state cannot be created without local netfilter administration.\nAC:L - Once CAP_NET_ADMIN is held in the target network namespace, xt_request_find_target() deterministically resolves UNSPEC-family SNAT/DNAT rev 1/2 targets for bridge chains, and sending bridge traffic through the committed rule reliably reaches nf_nat_setup_info() with a NULL nf_conn from nf_ct_get().\nPR:L - All nfnetlink handlers are gated by netlink_net_capable(skb, CAP_NET_ADMIN), which checks capability in the socket network namespace user namespace; unprivileged local users routinely obtain CAP_NET_ADMIN via user and network namespaces (unshare -Urn), enabling installation of the malicious bridge compat rule.\nUI:N - No victim interaction is required beyond the attacker obtaining namespace-local CAP_NET_ADMIN, creating a bridge nftables chain with a compat SNAT/DNAT target, and delivering matching bridge traffic; no third-party actions such as mounting filesystems or opening files are needed.\nS:U - Impact is confined to the host kernel netfilter/NAT subsystem within the same security authority; this is not a VM escape, hypervisor boundary crossing, or IOMMU/DMA sandbox bypass, but standard in-kernel misbehavior from an invalid family/target pairing.\nC:L - The primary runtime failure is a NULL nf_conn dereference in nf_nat_setup_info(), and the surrounding nft_compat bridge/xtables semantic mismatch can leak limited kernel information via oops register dumps and crash logs readable by the local attacker who triggered the fault.\nI:H - Missing family validation lets IP-family NAT targets execute under bridge nft_compat semantics where nf_ct_get() yields NULL, constituting a type/family confusion that can corrupt netfilter verdict and NAT handling before faulting; mis-instantiated SNAT/DNAT targets should not run in bridge context at all.\nA:H - Passing bridge traffic through a bridge-family compat SNAT/DNAT rule causes nf_nat_setup_info() to dereference the NULL connection from nf_ct_get(), producing a kernel oops or panic; repeated matching traffic can retrigger the crash for sustained denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/xt_nat.c"], "versions": [{"version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "49abe564391411057a26a9a943c8e17867c3b9b4", "status": "affected", "versionType": "git"}, {"version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82", "status": "affected", "versionType": "git"}, {"version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777", "status": "affected", "versionType": "git"}, {"version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "a842dab87cab29f2a5798a47b2dc5e6a449950bf", "status": "affected", "versionType": "git"}, {"version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "e35c048d7511e9d4c2a537b8a231c49606e97c16", "status": "affected", "versionType": "git"}, {"version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "679ced28a9dc2f6dc679eb05027d779693e60902", "status": "affected", "versionType": "git"}, {"version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "ec88fa71c82072e9189983b05b499d3507550271", "status": "affected", "versionType": "git"}, {"version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "5d1a2240935ea47e2673d0ea17fdb058e4dc91dd", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/xt_nat.c"], "versions": [{"version": "3.7", "status": "affected"}, {"version": "0", "lessThan": "3.7", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4"}, {"url": "https://git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82"}, {"url": "https://git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777"}, {"url": "https://git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf"}, {"url": "https://git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16"}, {"url": "https://git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902"}, {"url": "https://git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271"}, {"url": "https://git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd"}], "title": "netfilter: xt_nat: reject unsupported target families", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-80664", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:19:29.866934Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:32.191Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-80664", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T19:19:29.866934Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:19:31.475Z"}}], "cna": {"title": "netfilter: xt_nat: reject unsupported target families", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.3, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires installing a bridge-family nft_compat SNAT/DNAT rule via NETLINK_NETFILTER (nftables netlink), a local syscall path; although matching bridge traffic can trigger evaluation, the vulnerable rule state cannot be created without local netfilter administration.\nAC:L - Once CAP_NET_ADMIN is held in the target network namespace, xt_request_find_target() deterministically resolves UNSPEC-family SNAT/DNAT rev 1/2 targets for bridge chains, and sending bridge traffic through the committed rule reliably reaches nf_nat_setup_info() with a NULL nf_conn from nf_ct_get().\nPR:L - All nfnetlink handlers are gated by netlink_net_capable(skb, CAP_NET_ADMIN), which checks capability in the socket network namespace user namespace; unprivileged local users routinely obtain CAP_NET_ADMIN via user and network namespaces (unshare -Urn), enabling installation of the malicious bridge compat rule.\nUI:N - No victim interaction is required beyond the attacker obtaining namespace-local CAP_NET_ADMIN, creating a bridge nftables chain with a compat SNAT/DNAT target, and delivering matching bridge traffic; no third-party actions such as mounting filesystems or opening files are needed.\nS:U - Impact is confined to the host kernel netfilter/NAT subsystem within the same security authority; this is not a VM escape, hypervisor boundary crossing, or IOMMU/DMA sandbox bypass, but standard in-kernel misbehavior from an invalid family/target pairing.\nC:L - The primary runtime failure is a NULL nf_conn dereference in nf_nat_setup_info(), and the surrounding nft_compat bridge/xtables semantic mismatch can leak limited kernel information via oops register dumps and crash logs readable by the local attacker who triggered the fault.\nI:H - Missing family validation lets IP-family NAT targets execute under bridge nft_compat semantics where nf_ct_get() yields NULL, constituting a type/family confusion that can corrupt netfilter verdict and NAT handling before faulting; mis-instantiated SNAT/DNAT targets should not run in bridge context at all.\nA:H - Passing bridge traffic through a bridge-family compat SNAT/DNAT rule causes nf_nat_setup_info() to dereference the NULL connection from nf_ct_get(), producing a kernel oops or panic; repeated matching traffic can retrigger the crash for sustained denial of service."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "49abe564391411057a26a9a943c8e17867c3b9b4", "versionType": "git"}, {"status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82", "versionType": "git"}, {"status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777", "versionType": "git"}, {"status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "a842dab87cab29f2a5798a47b2dc5e6a449950bf", "versionType": "git"}, {"status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "e35c048d7511e9d4c2a537b8a231c49606e97c16", "versionType": "git"}, {"status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "679ced28a9dc2f6dc679eb05027d779693e60902", "versionType": "git"}, {"status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "ec88fa71c82072e9189983b05b499d3507550271", "versionType": "git"}, {"status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "lessThan": "5d1a2240935ea47e2673d0ea17fdb058e4dc91dd", "versionType": "git"}], "programFiles": ["net/netfilter/xt_nat.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.7"}, {"status": "unaffected", "version": "0", "lessThan": "3.7", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.261", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.212", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/netfilter/xt_nat.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4"}, {"url": "https://git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82"}, {"url": "https://git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777"}, {"url": "https://git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf"}, {"url": "https://git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16"}, {"url": "https://git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902"}, {"url": "https://git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271"}, {"url": "https://git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_nat: reject unsupported target families\n\nxt_nat SNAT and DNAT target handlers assume IP-family conntrack state\nis present and can dereference a NULL pointer when instantiated from an\nunsupported family through nft_compat. A bridge-family compat rule can\ntherefore trigger a NULL-dereference in nf_nat_setup_info().\n\nReject non-IP families in xt_nat_checkentry() so unsupported targets\ncannot be installed. Keep NFPROTO_INET allowed for valid inet NAT\ncompat users and leave the runtime fast path unchanged.\n\n[ The crash was fixed via\n 9dbba7e694ec (\"netfilter: nft_compat: ebtables emulation must reject non-bridge targets\"),\n so this patch is no longer critical.\n Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra\n family check is a good idea in any case. ]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "3.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "3.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "3.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "3.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "3.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "3.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "3.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "3.7"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:21:50.580Z"}}}, "cveMetadata": {"cveId": "CVE-2026-80664", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:26:32.191Z", "dateReserved": "2026-08-26T14:34:25.781Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-28T06:49:07.478Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/xt_nat.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "49abe564391411057a26a9a943c8e17867c3b9b4", "status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "versionType": "git"}, {"lessThan": "0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82", "status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "versionType": "git"}, {"lessThan": "4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777", "status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "versionType": "git"}, {"lessThan": "a842dab87cab29f2a5798a47b2dc5e6a449950bf", "status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "versionType": "git"}, {"lessThan": "e35c048d7511e9d4c2a537b8a231c49606e97c16", "status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "versionType": "git"}, {"lessThan": "679ced28a9dc2f6dc679eb05027d779693e60902", "status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "versionType": "git"}, {"lessThan": "ec88fa71c82072e9189983b05b499d3507550271", "status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "versionType": "git"}, {"lessThan": "5d1a2240935ea47e2673d0ea17fdb058e4dc91dd", "status": "affected", "version": "c7232c9979cba684c50b64c513c4a83c9aa70563", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/netfilter/xt_nat.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.7"}, {"lessThan": "3.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_nat: reject unsupported target families\n\nxt_nat SNAT and DNAT target handlers assume IP-family conntrack state\nis present and can dereference a NULL pointer when instantiated from an\nunsupported family through nft_compat. A bridge-family compat rule can\ntherefore trigger a NULL-dereference in nf_nat_setup_info().\n\nReject non-IP families in xt_nat_checkentry() so unsupported targets\ncannot be installed. Keep NFPROTO_INET allowed for valid inet NAT\ncompat users and leave the runtime fast path unchanged.\n\n[ The crash was fixed via\n 9dbba7e694ec (\"netfilter: nft_compat: ebtables emulation must reject non-bridge targets\"),\n so this patch is no longer critical.\n Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra\n family check is a good idea in any case. ]"}], "id": "CVE-2026-80664", "lastModified": "2026-10-16T20:18:05.470", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.5, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-80664", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:19:29.866934Z", "version": "2.0.3"}}]}, "published": "2026-08-28T08:16:51.620", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: netfilter: xt_nat: reject unsupported target families", "id": "2525374", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525374"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: xt_nat: reject unsupported target families\nxt_nat SNAT and DNAT target handlers assume IP-family conntrack state\nis present and can dereference a NULL pointer when instantiated from an\nunsupported family through nft_compat. A bridge-family compat rule can\ntherefore trigger a NULL-dereference in nf_nat_setup_info().\nReject non-IP families in xt_nat_checkentry() so unsupported targets\ncannot be installed. Keep NFPROTO_INET allowed for valid inet NAT\ncompat users and leave the runtime fast path unchanged.\n[ The crash was fixed via\n9dbba7e694ec (\"netfilter: nft_compat: ebtables emulation must reject non-bridge targets\"),\nso this patch is no longer critical.\nNevertheless, NAT is only relevant for ipv4/ipv6, so this extra\nfamily check is a good idea in any case. ]", "A flaw was found in the Linux kernel's netfilter component, specifically within the xt_nat SNAT and DNAT target handlers. These handlers incorrectly assume the presence of an IP-family connection tracking state. A local attacker, by instantiating these handlers from an unsupported family, such as a bridge-family, through nft_compat, could trigger a NULL pointer dereference. This vulnerability could lead to a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-80664", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80664\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80664\nhttps://lore.kernel.org/linux-cve-announce/2026082846-CVE-2026-80664-664b@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7232c9979cba684c50b64c513c4a83c9aa70563,49abe564391411057a26a9a943c8e17867c3b9b4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7232c9979cba684c50b64c513c4a83c9aa70563,0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7232c9979cba684c50b64c513c4a83c9aa70563,4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7232c9979cba684c50b64c513c4a83c9aa70563,a842dab87cab29f2a5798a47b2dc5e6a449950bf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7232c9979cba684c50b64c513c4a83c9aa70563,e35c048d7511e9d4c2a537b8a231c49606e97c16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7232c9979cba684c50b64c513c4a83c9aa70563,679ced28a9dc2f6dc679eb05027d779693e60902)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7232c9979cba684c50b64c513c4a83c9aa70563,ec88fa71c82072e9189983b05b499d3507550271)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c7232c9979cba684c50b64c513c4a83c9aa70563,5d1a2240935ea47e2673d0ea17fdb058e4dc91dd)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.261,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.212,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.5,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-28T10:00:06.819854+00:00", "updated": "2026-08-29T07:45:06.305151+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476"]}