CVE-2026-53212

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When these packets are eventually dequeued, dst_release()\noperates on freed memory.\n\nReplace metadata_dst_free() with dst_release() so the metadata_dst\nis freed only after all references are dropped. The dst subsystem\nalready handles metadata_dst cleanup in dst_destroy() when\nDST_METADATA is set."}], "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 nft_tunnel object is created, referenced, and destroyed through nf_tables netlink operations and packet processing configured locally via nftables/netdev hooks. Remote packets may help populate a queue, but exploitation requires local control of nftables transactions.\nAC:L - The attacker can set up the tunnel object/rule, arrange queued packets such as with netem, and delete the rule/object sequence under their control. No uncontrollable race or rare external condition is required.\nPR:L - nfnetlink requires CAP_NET_ADMIN in the socket network namespace, and nftables/netfilter is reachable by an unprivileged local user through user and network namespaces on typical affected systems. This is low privilege rather than real init-namespace root.\nUI:N - No victim user action is required after the attacker has local execution. The trigger is performed through attacker-issued netlink configuration and packet generation/dequeue.\nS:U - The bug corrupts kernel networking memory and can lead to local kernel privilege escalation within the same security authority. It is not a VM escape, IOMMU bypass, or other CVSS scope-changing boundary crossing.\nC:H - This is a heap use-after-free of a metadata_dst referenced from queued skbs, and similar nf_tables UAFs are exploitable for kernel memory disclosure. Following the higher-severity rule for UAFs, confidentiality impact is high.\nI:H - The freed dst/metadata object can be reclaimed and later operated on through dst_release and related networking paths, giving a plausible route to memory corruption and control-flow or arbitrary write exploitation. Following the kernel UAF guidance, integrity impact is high.\nA:H - Even without full exploitation, dequeuing packets with a dangling dst pointer can cause a kernel oops, panic, or memory-corruption crash. Availability impact is therefore high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nft_tunnel.c"], "versions": [{"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "349df61526d2e39decc685d246202e3e284cfe05", "status": "affected", "versionType": "git"}, {"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "55b79b1ae42372012413ce0413181d26679b17ef", "status": "affected", "versionType": "git"}, {"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "5e9ee18b27fde88cb6148202b33916c66693fe82", "status": "affected", "versionType": "git"}, {"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "8767fe4079affa74314d7eb3220e700150289842", "status": "affected", "versionType": "git"}, {"version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": 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"7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05"}, {"url": "https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef"}, {"url": "https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82"}, {"url": "https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842"}, {"url": "https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e"}, {"url": "https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3"}, {"url": "https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43"}, {"url": "https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a"}], "title": "netfilter: nft_tunnel: fix use-after-free on object destroy", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:22:41.849Z"}, 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Remote packets may help populate a queue, but exploitation requires local control of nftables transactions.\nAC:L - The attacker can set up the tunnel object/rule, arrange queued packets such as with netem, and delete the rule/object sequence under their control. No uncontrollable race or rare external condition is required.\nPR:L - nfnetlink requires CAP_NET_ADMIN in the socket network namespace, and nftables/netfilter is reachable by an unprivileged local user through user and network namespaces on typical affected systems. This is low privilege rather than real init-namespace root.\nUI:N - No victim user action is required after the attacker has local execution. The trigger is performed through attacker-issued netlink configuration and packet generation/dequeue.\nS:U - The bug corrupts kernel networking memory and can lead to local kernel privilege escalation within the same security authority. It is not a VM escape, IOMMU bypass, or other CVSS scope-changing boundary crossing.\nC:H - This is a heap use-after-free of a metadata_dst referenced from queued skbs, and similar nf_tables UAFs are exploitable for kernel memory disclosure. Following the higher-severity rule for UAFs, confidentiality impact is high.\nI:H - The freed dst/metadata object can be reclaimed and later operated on through dst_release and related networking paths, giving a plausible route to memory corruption and control-flow or arbitrary write exploitation. Following the kernel UAF guidance, integrity impact is high.\nA:H - Even without full exploitation, dequeuing packets with a dangling dst pointer can cause a kernel oops, panic, or memory-corruption crash. Availability impact is therefore high."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "349df61526d2e39decc685d246202e3e284cfe05", "versionType": "git"}, {"status": "affected", "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "55b79b1ae42372012413ce0413181d26679b17ef", "versionType": "git"}, {"status": "affected", "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "5e9ee18b27fde88cb6148202b33916c66693fe82", "versionType": "git"}, {"status": "affected", "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "8767fe4079affa74314d7eb3220e700150289842", "versionType": "git"}, {"status": "affected", "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "fda6573a46ad24f35348e024905ee5bdf729797e", "versionType": "git"}, {"status": "affected", "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3", "versionType": "git"}, {"status": "affected", "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "f9a0e4b61054cde89a2a77845293c726cc07cc43", "versionType": "git"}, {"status": "affected", "version": "af308b94a2a4a5a27bec9028354c4df444a7c8ba", "lessThan": "c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a", "versionType": "git"}], "programFiles": ["net/netfilter/nft_tunnel.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.19"}, {"status": "unaffected", "version": "0", "lessThan": "4.19", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.94", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.36", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.13", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/netfilter/nft_tunnel.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05"}, {"url": "https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef"}, {"url": "https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82"}, {"url": "https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842"}, {"url": "https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e"}, {"url": "https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3"}, {"url": "https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43"}, {"url": "https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_tunnel: fix use-after-free on object destroy\n\nnft_tunnel_obj_destroy() calls metadata_dst_free() which directly\nkfree()s the metadata_dst, ignoring the dst_entry refcount. Packets\nthat took a reference via dst_hold() in nft_tunnel_obj_eval() and\nare still queued (e.g. in a netem qdisc) are left with a dangling\npointer. When these packets are eventually dequeued, dst_release()\noperates on freed memory.\n\nReplace metadata_dst_free() with dst_release() so the metadata_dst\nis freed only after all references are dropped. 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Packets\nthat took a reference via dst_hold() in nft_tunnel_obj_eval() and\nare still queued (e.g. in a netem qdisc) are left with a dangling\npointer. When these packets are eventually dequeued, dst_release()\noperates on freed memory.\n\nReplace metadata_dst_free() with dst_release() so the metadata_dst\nis freed only after all references are dropped. The dst subsystem\nalready handles metadata_dst cleanup in dst_destroy() when\nDST_METADATA is set."}], "id": "CVE-2026-53212", "lastModified": "2026-10-19T20:19:09.740", "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-2026-53212", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:26:56.855594Z", "version": "2.0.3"}}]}, "published": "2026-06-25T09:16:38.793", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "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: netfilter: nft_tunnel: fix use-after-free on object destroy", "id": "2492847", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492847"}, "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-1341", "details": ["A flaw was found in the Linux kernel's netfilter component, specifically within the nft_tunnel module. This vulnerability occurs due to a use-after-free error when an object is destroyed, where memory is prematurely deallocated while still being referenced by queued network packets. This can lead to system instability or a denial of service (DoS) condition, as subsequent operations attempt to access freed memory."], "name": "CVE-2026-53212", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not 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": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53212\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53212\nhttps://lore.kernel.org/linux-cve-announce/2026062503-CVE-2026-53212-ce23@gregkh/T"], "threat_severity": "Moderate"}

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