CVE-2026-63858

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The vulnerability is reachable only through local Netlink syscalls to the nf_tables subsystem (NFT_MSG_DELCHAIN/DELFLOWTABLE hook deletion racing with GETCHAIN/GETFLOWTABLE dumps), which per kernel CNA guidance is Attack Vector Local, not network-reachable.\nAC:L - The attacker controls both sides of the race by opening concurrent Netlink sockets\u2014one issuing hook-deletion batch commands and another issuing chain/flowtable dumps\u2014making successful triggering reliably achievable without conditions outside attacker control.\nPR:L - All nf_tables Netlink operations require CAP_NET_ADMIN checked in nfnetlink_rcv(), which is obtainable by an unprivileged user via user namespaces (unshare -Urn), so privileges required are Low rather than High.\nUI:N - Exploitation requires no victim interaction; the attacker triggers the race entirely through their own concurrent Netlink requests without needing another user to perform any action.\nS:U - Impact remains within the kernel's security authority (kernel crash, memory corruption, potential local privilege escalation) rather than crossing a distinct security boundary such as VM guest-to-host escape.\nC:H - RCU list corruption yields a bogus nft_hook pointer that dereferences arbitrary kernel memory (e.g., reading hook->ifname from stack-local or freed memory), constituting arbitrary kernel memory read potential consistent with High confidentiality impact.\nI:H - The corrupted list traversal produces invalid struct nft_hook pointers via container_of(), enabling heap/stack memory corruption that can be leveraged for arbitrary write or control-flow hijacking, warranting High integrity impact.\nA:H - The race reliably causes kernel oops/panic from dereferencing bogus nft_hook pointers during concurrent Netlink dumps, and the underlying RCU list corruption can crash or hang the system, giving High availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/netfilter/nf_tables.h", "net/netfilter/nf_tables_api.c"], "versions": [{"version": "b6d9014a3335194590abdd2a2471ef5147a67645", "lessThan": "768daa9f4276be4007e88dea61a378c8582ba008", "status": "affected", "versionType": "git"}, {"version": "b6d9014a3335194590abdd2a2471ef5147a67645", "lessThan": "4e69bfb32b2db323d9205fdb30e284481b37817c", "status": "affected", "versionType": "git"}, {"version": "b6d9014a3335194590abdd2a2471ef5147a67645", "lessThan": "10f79dbd7719d1da9f5884d13060322d8729f091", "status": "affected", "versionType": "git"}, {"version": "7a248f9c74f9f62799718c12efd9e9e391d60b6f", "status": "affected", "versionType": "git"}, {"version": "f275989ad04159dbfc62cefb65ba9c5ba1d7c34f", "status": "affected", "versionType": "git"}, {"version": "62d91062058b42bf70b2c3446aec397bb0ce15ee", "status": "affected", "versionType": "git"}, {"version": "99180dec5ae582227219d1fdd0dd5ccf53ec7491", "status": "affected", "versionType": "git"}, {"version": "5.10.122", "lessThan": "5.11", "status": "affected", "versionType": "semver"}, {"version": "5.15.47", "lessThan": "5.16", "status": "affected", "versionType": "semver"}, {"version": "5.17.15", "lessThan": "5.18", "status": "affected", "versionType": "semver"}, {"version": "5.18.4", "lessThan": "5.19", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/netfilter/nf_tables.h", "net/netfilter/nf_tables_api.c"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.19", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.122"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.47"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17.15"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18.4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/768daa9f4276be4007e88dea61a378c8582ba008"}, {"url": "https://git.kernel.org/stable/c/4e69bfb32b2db323d9205fdb30e284481b37817c"}, {"url": "https://git.kernel.org/stable/c/10f79dbd7719d1da9f5884d13060322d8729f091"}], "title": "netfilter: nf_tables: add hook transactions for device deletions", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63858", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:32:27.434041Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:07:52.230Z"}}]}}

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"descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: add hook transactions for device deletions\n\nRestore the flag that indicates that the hook is going away, ie.\nNFT_HOOK_REMOVE, but add a new transaction object to track deletion\nof hooks without altering the basechain/flowtable hook_list during\nthe preparation phase.\n\nThe existing approach that moves the hook from the basechain/flowtable\nhook_list to transaction hook_list breaks netlink dump path readers\nof this RCU-protected list.\n\nIt should be possible use an array for nft_trans_hook to store the\ndeleted hooks to compact the representation but I am not expecting\nmany hook object, specially now that wildcard support for devices\nis in place.\n\nNote that the nft_trans_chain_hooks() list contains a list of struct\nnft_trans_hook objects for DELCHAIN and DELFLOWTABLE commands, while\nthis list stores struct nft_hook objects for NEWCHAIN and NEWFLOWTABLE.\nNote that new commands can be updated to use nft_trans_hook for\nconsistency.\n\nThis patch also adapts the event notification path to deal with the list\nof hook transactions."}], "id": "CVE-2026-63858", "lastModified": "2026-10-26T16:27:27.510", "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-2026-63858", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:32:27.434041Z", "version": "2.0.3"}}]}, "published": "2026-07-19T15:16:52.643", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/10f79dbd7719d1da9f5884d13060322d8729f091"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4e69bfb32b2db323d9205fdb30e284481b37817c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/768daa9f4276be4007e88dea61a378c8582ba008"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: netfilter: nf_tables: add hook transactions for device deletions", "id": "2502303", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502303"}, "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-821", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: nf_tables: add hook transactions for device deletions\nRestore the flag that indicates that the hook is going away, ie.\nNFT_HOOK_REMOVE, but add a new transaction object to track deletion\nof hooks without altering the basechain/flowtable hook_list during\nthe preparation phase.\nThe existing approach that moves the hook from the basechain/flowtable\nhook_list to transaction hook_list breaks netlink dump path readers\nof this RCU-protected list.\nIt should be possible use an array for nft_trans_hook to store the\ndeleted hooks to compact the representation but I am not expecting\nmany hook object, specially now that wildcard support for devices\nis in place.\nNote that the nft_trans_chain_hooks() list contains a list of struct\nnft_trans_hook objects for DELCHAIN and DELFLOWTABLE commands, while\nthis list stores struct nft_hook objects for NEWCHAIN and NEWFLOWTABLE.\nNote that new commands can be updated to use nft_trans_hook for\nconsistency.\nThis patch also adapts the event notification path to deal with the list\nof hook transactions.", "A flaw was found in the Linux kernel's netfilter (nf_tables) subsystem. This vulnerability could lead to a denial of service for network filtering operations. The issue occurs because the process of deleting network hooks improperly modifies a protected list, which can disrupt how network configuration information is read. This could be exploited by an attacker to cause instability or unresponsiveness in the system's network filtering capabilities."], "name": "CVE-2026-63858", "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": "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": "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": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63858\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63858\nhttps://lore.kernel.org/linux-cve-announce/2026071933-CVE-2026-63858-618e@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b6d9014a3335194590abdd2a2471ef5147a67645,4e69bfb32b2db323d9205fdb30e284481b37817c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b6d9014a3335194590abdd2a2471ef5147a67645,10f79dbd7719d1da9f5884d13060322d8729f091)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "7a248f9c74f9f62799718c12efd9e9e391d60b6f"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "f275989ad04159dbfc62cefb65ba9c5ba1d7c34f"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "62d91062058b42bf70b2c3446aec397bb0ce15ee"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "99180dec5ae582227219d1fdd0dd5ccf53ec7491"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.10.122,5.11)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.47,5.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.17.15,5.18)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.18.4,5.19)"}}], "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": "5.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.10,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-07-21T03:15:02.662941+00:00", "updated": "2026-10-20T08:30:12.213073+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}