{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23392", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.011Z", "datePublished": "2026-03-25T10:33:16.647Z", "dateUpdated": "2026-08-05T12:21:23.296Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:21:23.296Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: release flowtable after rcu grace period on error\n\nCall synchronize_rcu() after unregistering the hooks from error path,\nsince a hook that already refers to this flowtable can be already\nregistered, exposing this flowtable to packet path and nfnetlink_hook\ncontrol plane.\n\nThis error path is rare, it should only happen by reaching the maximum\nnumber hooks or by failing to set up to hardware offload, just call\nsynchronize_rcu().\n\nThere is a check for already used device hooks by different flowtable\nthat could result in EEXIST at this late stage. The hook parser can be\nupdated to perform this check earlier to this error path really becomes\nrarely exercised.\n\nUncovered by KASAN reported as use-after-free from nfnetlink_hook path\nwhen dumping hooks." } ], "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 - nftables is accessed via netlink sockets (NFNL_SUBSYS_NFTABLES), requiring local system access through the netlink interface.\nAC:L - The attacker controls both sides of the race: they trigger the flowtable creation error path (via duplicate hooks causing EEXIST) and concurrently perform nfnetlink_hook dumps. Since the attacker controls both racing operations, complexity is Low.\nPR:L - nftables is reachable from unprivileged user namespaces (unshare -Urn), so only basic unprivileged user access is required.\nUI:N - No user interaction is needed; the attacker can trigger the flowtable creation and concurrent hook dump entirely on their own.\nS:U - This is a standard kernel use-after-free vulnerability within the same security authority (kernel space); it does not cross a security boundary like a VM escape.\nC:H - Use-after-free of the nft_flowtable heap object allows an attacker to control freed object contents via heap spraying, enabling arbitrary kernel memory reads.\nI:H - Use-after-free enables heap spraying to place attacker-controlled data in the freed flowtable object, providing arbitrary write primitives and potential control flow hijacking.\nA:H - Use-after-free reliably causes kernel crashes (oops/panic) when the freed flowtable memory is accessed by RCU readers on the packet path or nfnetlink_hook dump." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nf_tables_api.c" ], "versions": [ { "version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8", "lessThan": "d2632de96ccb066e0131ad1494241b9c281c60b8", "status": "affected", "versionType": "git" }, { "version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8", "lessThan": "adee3436ccd29f1e514c028899e400cbc6d84065", "status": "affected", "versionType": "git" }, { "version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8", "lessThan": "7e3955b282eae20d61c75e499c75eade51c20060", "status": "affected", "versionType": "git" }, { "version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8", "lessThan": "c8092edb9a11f20f95ccceeb9422b7dd0df337bd", "status": "affected", "versionType": "git" }, { "version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8", "lessThan": "e78a2dcc7cfb87b64a631441ca7681492b347ef6", "status": "affected", "versionType": "git" }, { "version": "3b49e2e94e6ebb8b23d0955d9e898254455734f8", "lessThan": "d73f4b53aaaea4c95f245e491aa5eeb8a21874ce", "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/nf_tables_api.c" ], "versions": [ { "version": "4.16", "status": "affected" }, { "version": "0", "lessThan": "4.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "4.16", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.18.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.19.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d2632de96ccb066e0131ad1494241b9c281c60b8" }, { "url": "https://git.kernel.org/stable/c/adee3436ccd29f1e514c028899e400cbc6d84065" }, { "url": "https://git.kernel.org/stable/c/7e3955b282eae20d61c75e499c75eade51c20060" }, { "url": "https://git.kernel.org/stable/c/c8092edb9a11f20f95ccceeb9422b7dd0df337bd" }, { "url": "https://git.kernel.org/stable/c/e78a2dcc7cfb87b64a631441ca7681492b347ef6" }, { "url": "https://git.kernel.org/stable/c/d73f4b53aaaea4c95f245e491aa5eeb8a21874ce" } ], "title": "netfilter: nf_tables: release flowtable after rcu grace period on error", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": 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