CVE-2026-64572

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When a\nnotifier fails, the error path removes new_fa with fib_remove_alias()\n(hlist_del_rcu) and frees it right away with kmem_cache_free().\n\nfib_table_lookup() walks that list under rcu_read_lock() only, so a\nconcurrent lookup that already reached new_fa keeps reading it after the\nfree:\n\n BUG: KASAN: slab-use-after-free in fib_table_lookup (net/ipv4/fib_trie.c:1601)\n Read of size 1 at addr ffff88810676d4eb by task exploit/297\n Call Trace:\n fib_table_lookup (net/ipv4/fib_trie.c:1601)\n ip_route_output_key_hash_rcu (net/ipv4/route.c:2814)\n ip_route_output_key_hash (net/ipv4/route.c:2705)\n __ip4_datagram_connect (net/ipv4/datagram.c:49)\n udp_connect (net/ipv4/udp.c:2144)\n __sys_connect (net/socket.c:2167)\n __x64_sys_connect (net/socket.c:2173)\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n which belongs to the cache ip_fib_alias of size 56\n\nTriggering the error path needs CAP_NET_ADMIN and a registered fib\nnotifier that can reject a route; a netdevsim device whose IPv4 FIB\nresource is exhausted is enough.\n\nFree new_fa with alias_free_mem_rcu(), as fib_table_delete() already\ndoes for a fib_alias removed from the trie."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/fib_trie.c"], "versions": [{"version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "9d0778571def598c31e84a38ae5a7ebc6f65e6d8", "status": "affected", "versionType": "git"}, {"version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "bb03350f974aec352b660d032a1d283eb462165a", "status": "affected", "versionType": "git"}, {"version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "6429c9cfd941e62acd7bb0bc64d631574d4c3b2a", "status": "affected", "versionType": "git"}, {"version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "8150b5365f026e72250cacc527ea00be30f40105", "status": "affected", "versionType": "git"}, {"version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "d007056868723de9c0cc3f5ffaad47a8d468b9a4", "status": "affected", "versionType": "git"}, {"version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "cb8be318b4432abd88d3172ec157330f27a5f7a7", "status": "affected", "versionType": "git"}, {"version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "b8d2ea75c76abcd0d72679c2f488271f573e32fb", "status": "affected", "versionType": "git"}, {"version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "lessThan": "f2f152e94a67bc746afaf05a1b2702c195553112", "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/ipv4/fib_trie.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "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": "5.6", 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"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9d0778571def598c31e84a38ae5a7ebc6f65e6d8"}, {"url": "https://git.kernel.org/stable/c/bb03350f974aec352b660d032a1d283eb462165a"}, {"url": "https://git.kernel.org/stable/c/6429c9cfd941e62acd7bb0bc64d631574d4c3b2a"}, {"url": "https://git.kernel.org/stable/c/8150b5365f026e72250cacc527ea00be30f40105"}, {"url": "https://git.kernel.org/stable/c/d007056868723de9c0cc3f5ffaad47a8d468b9a4"}, {"url": "https://git.kernel.org/stable/c/cb8be318b4432abd88d3172ec157330f27a5f7a7"}, {"url": "https://git.kernel.org/stable/c/b8d2ea75c76abcd0d72679c2f488271f573e32fb"}, {"url": "https://git.kernel.org/stable/c/f2f152e94a67bc746afaf05a1b2702c195553112"}], "title": "ipv4: fib: free fib_alias with kfree_rcu() on insert error path", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64572", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:41:42.353630Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:44:57.697Z"}}]}}

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When a\nnotifier fails, the error path removes new_fa with fib_remove_alias()\n(hlist_del_rcu) and frees it right away with kmem_cache_free().\n\nfib_table_lookup() walks that list under rcu_read_lock() only, so a\nconcurrent lookup that already reached new_fa keeps reading it after the\nfree:\n\n BUG: KASAN: slab-use-after-free in fib_table_lookup (net/ipv4/fib_trie.c:1601)\n Read of size 1 at addr ffff88810676d4eb by task exploit/297\n Call Trace:\n fib_table_lookup (net/ipv4/fib_trie.c:1601)\n ip_route_output_key_hash_rcu (net/ipv4/route.c:2814)\n ip_route_output_key_hash (net/ipv4/route.c:2705)\n __ip4_datagram_connect (net/ipv4/datagram.c:49)\n udp_connect (net/ipv4/udp.c:2144)\n __sys_connect (net/socket.c:2167)\n __x64_sys_connect (net/socket.c:2173)\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n which belongs to the cache ip_fib_alias of size 56\n\nTriggering the error path needs CAP_NET_ADMIN and a registered fib\nnotifier that can reject a route; a netdevsim device whose IPv4 FIB\nresource is exhausted is enough.\n\nFree new_fa with alias_free_mem_rcu(), as fib_table_delete() already\ndoes for a fib_alias removed from the trie."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.148", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:28:49.541Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64572", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:44:57.697Z", "dateReserved": "2026-07-19T15:36:31.797Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-05T08:08:09.068Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/fib_trie.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9d0778571def598c31e84a38ae5a7ebc6f65e6d8", "status": "affected", "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "versionType": "git"}, {"lessThan": "bb03350f974aec352b660d032a1d283eb462165a", "status": "affected", "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "versionType": "git"}, {"lessThan": "6429c9cfd941e62acd7bb0bc64d631574d4c3b2a", "status": "affected", "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "versionType": "git"}, {"lessThan": "8150b5365f026e72250cacc527ea00be30f40105", "status": "affected", "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "versionType": "git"}, {"lessThan": "d007056868723de9c0cc3f5ffaad47a8d468b9a4", "status": "affected", "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "versionType": "git"}, {"lessThan": "cb8be318b4432abd88d3172ec157330f27a5f7a7", "status": "affected", "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "versionType": "git"}, {"lessThan": "b8d2ea75c76abcd0d72679c2f488271f573e32fb", "status": "affected", "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "versionType": "git"}, {"lessThan": "f2f152e94a67bc746afaf05a1b2702c195553112", "status": "affected", "version": "a6c76c17df021b141b0d306828c9fe4ba2d2717c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/fib_trie.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"lessThan": "5.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "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\nipv4: fib: free fib_alias with kfree_rcu() on insert error path\n\nfib_table_insert() publishes new_fa into the leaf's fa_list with\nfib_insert_alias() before calling the fib entry notifiers. When a\nnotifier fails, the error path removes new_fa with fib_remove_alias()\n(hlist_del_rcu) and frees it right away with kmem_cache_free().\n\nfib_table_lookup() walks that list under rcu_read_lock() only, so a\nconcurrent lookup that already reached new_fa keeps reading it after the\nfree:\n\n BUG: KASAN: slab-use-after-free in fib_table_lookup (net/ipv4/fib_trie.c:1601)\n Read of size 1 at addr ffff88810676d4eb by task exploit/297\n Call Trace:\n fib_table_lookup (net/ipv4/fib_trie.c:1601)\n ip_route_output_key_hash_rcu (net/ipv4/route.c:2814)\n ip_route_output_key_hash (net/ipv4/route.c:2705)\n __ip4_datagram_connect (net/ipv4/datagram.c:49)\n udp_connect (net/ipv4/udp.c:2144)\n __sys_connect (net/socket.c:2167)\n __x64_sys_connect (net/socket.c:2173)\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n which belongs to the cache ip_fib_alias of size 56\n\nTriggering the error path needs CAP_NET_ADMIN and a registered fib\nnotifier that can reject a route; a netdevsim device whose IPv4 FIB\nresource is exhausted is enough.\n\nFree new_fa with alias_free_mem_rcu(), as fib_table_delete() already\ndoes for a fib_alias removed from the trie."}], "id": "CVE-2026-64572", "lastModified": "2026-11-06T17:19:16.017", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64572", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:41:42.353630Z", "version": "2.0.3"}}]}, "published": "2026-08-05T08:16:36.927", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6429c9cfd941e62acd7bb0bc64d631574d4c3b2a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8150b5365f026e72250cacc527ea00be30f40105"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9d0778571def598c31e84a38ae5a7ebc6f65e6d8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b8d2ea75c76abcd0d72679c2f488271f573e32fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bb03350f974aec352b660d032a1d283eb462165a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cb8be318b4432abd88d3172ec157330f27a5f7a7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d007056868723de9c0cc3f5ffaad47a8d468b9a4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f2f152e94a67bc746afaf05a1b2702c195553112"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ipv4: fib: free fib_alias with kfree_rcu() on insert error path", "id": "2511413", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511413"}, "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-825", "details": ["A flaw was found in the Linux kernel's IPv4 forwarding information base (FIB) component. A local attacker with administrative network capabilities (CAP_NET_ADMIN) could exploit a timing issue during route insertion and lookup operations. This could lead to a \"use-after-free\" vulnerability, where the system attempts to access memory that has already been released. The most important consequence is a denial of service, potentially causing system instability or crashes."], "name": "CVE-2026-64572", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2026-08-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64572\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64572\nhttps://lore.kernel.org/linux-cve-announce/2026080559-CVE-2026-64572-e260@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a6c76c17df021b141b0d306828c9fe4ba2d2717c,8150b5365f026e72250cacc527ea00be30f40105)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a6c76c17df021b141b0d306828c9fe4ba2d2717c,d007056868723de9c0cc3f5ffaad47a8d468b9a4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a6c76c17df021b141b0d306828c9fe4ba2d2717c,cb8be318b4432abd88d3172ec157330f27a5f7a7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a6c76c17df021b141b0d306828c9fe4ba2d2717c,b8d2ea75c76abcd0d72679c2f488271f573e32fb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a6c76c17df021b141b0d306828c9fe4ba2d2717c,f2f152e94a67bc746afaf05a1b2702c195553112)"}}], "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": "5.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "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": "2026-08-05T09:30:11.603935+00:00", "updated": "2026-08-06T16:45:07.286165+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}