{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23412", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.013Z", "datePublished": "2026-04-02T11:40:53.528Z", "dateUpdated": "2026-08-05T12:21:32.513Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:21:32.513Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bpf: defer hook memory release until rcu readers are done\n\nYiming Qian reports UaF when concurrent process is dumping hooks via\nnfnetlink_hooks:\n\nBUG: KASAN: slab-use-after-free in nfnl_hook_dump_one.isra.0+0xe71/0x10f0\nRead of size 8 at addr ffff888003edbf88 by task poc/79\nCall Trace:\n \n nfnl_hook_dump_one.isra.0+0xe71/0x10f0\n netlink_dump+0x554/0x12b0\n nfnl_hook_get+0x176/0x230\n [..]\n\nDefer release until after concurrent readers have completed." } ], "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 paths are reached through local BPF syscalls and NETLINK_NETFILTER hook dump requests, not by unauthenticated network packets alone.\nAC:L - The bug is a race between BPF netfilter link teardown and nfnetlink hook dumping, and a local attacker can control both sides by creating/destroying links while issuing dump requests.\nPR:L - The path requires local BPF/netfilter privileges such as CAP_NET_ADMIN and BPF permissions, which are reasonably reachable in user/net namespace or delegated BPF-token deployments rather than requiring real init-namespace root.\nUI:N - No victim action is needed once the attacker can run the local operations; the attacker triggers the attach/detach and dump operations directly.\nS:U - The impact is within the kernel security authority and does not cross a VM, IOMMU, or similar separate security scope.\nC:H - This is a kernel use-after-free of a netfilter hook object read under RCU after immediate link deallocation, and heap reuse can expose controlled or stale kernel pointers and data.\nI:H - As a kernel use-after-free in attacker-influenced heap memory, it is defensibly exploitable for memory corruption or control-flow manipulation under the required overestimate rule.\nA:H - The reported KASAN slab-use-after-free in nfnl_hook_dump_one can crash or panic the kernel, and repeated local triggering can cause full system 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/nf_bpf_link.c" ], "versions": [ { "version": "84601d6ee68ae820dec97450934797046d62db4b", "lessThan": "d016c216bc75c45128160593a77b864a04dbe7c0", "status": "affected", "versionType": "git" }, { "version": "84601d6ee68ae820dec97450934797046d62db4b", "lessThan": "cb2bf5efdb02a2a59faf603604a1066e8266f349", "status": "affected", "versionType": "git" }, { "version": "84601d6ee68ae820dec97450934797046d62db4b", "lessThan": "c25e0dec366ae99b7264324ce3c7cbaea34691f9", "status": "affected", "versionType": "git" }, { "version": "84601d6ee68ae820dec97450934797046d62db4b", "lessThan": "54244d54a971c26a0cd0a9073460ff71f3c51b32", "status": "affected", "versionType": "git" }, { "version": "84601d6ee68ae820dec97450934797046d62db4b", "lessThan": "24f90fa3994b992d1a09003a3db2599330a5232a", "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_bpf_link.c" ], "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "lessThan": "6.4", "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": "6.4", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.18.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.19.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d016c216bc75c45128160593a77b864a04dbe7c0" }, { "url": "https://git.kernel.org/stable/c/cb2bf5efdb02a2a59faf603604a1066e8266f349" }, { "url": "https://git.kernel.org/stable/c/c25e0dec366ae99b7264324ce3c7cbaea34691f9" }, { "url": "https://git.kernel.org/stable/c/54244d54a971c26a0cd0a9073460ff71f3c51b32" }, { "url": "https://git.kernel.org/stable/c/24f90fa3994b992d1a09003a3db2599330a5232a" } ], "title": "netfilter: bpf: defer hook memory release until rcu readers are done", "x_generator": { "engine": "bippy-1.2.0" } } } }