CVE-2026-72434

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The bug is reached only via NFNETLINK ipset destroy/cleanup (IPSET_CMD_DESTROY or netns exit calling cancel_gc), not by processing remote packets; all entry points are local netlink syscalls into net/netfilter/ipset.\nAC:L - An attacker with CAP_NET_ADMIN creates a timeout hash ipset, waits for the workqueue GC to run, then destroys the set; because mtype_gc always re-queues itself at the end of execution, cancel_delayed_work_sync reliably leaves a pending GC after teardown.\nPR:L - All ipset management, including set destroy that calls mtype_cancel_gc, requires CAP_NET_ADMIN checked by netlink_net_capable in nfnetlink; unprivileged users can obtain this in an isolated user+network namespace via unshare -Urn.\nUI:N - Exploitation is fully automated through netlink ipset create/destroy commands and does not require any victim user action such as mounting filesystems or opening files.\nS:U - The use-after-free corrupts kernel heap memory within the same host kernel security boundary; it does not by itself cross VM, container runtime, or IOMMU isolation boundaries.\nC:H - After teardown, the orphaned GC work dereferences freed ip_set and htype structures (including embedded delayed_work), a classic slab UAF that enables heap grooming and arbitrary kernel memory disclosure.\nI:H - UAF on ipset hash control structures and hbucket data allows corrupting freed heap objects and building write primitives for control-flow hijacking and local privilege escalation beyond the caller's namespace.\nA:H - Dereferencing freed set, htype, and hash table memory from the GC workqueue can immediately trigger kernel oopses or panics, and the bug is repeatable on every destroy of a timeout hash ipset."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/ipset/ip_set_hash_gen.h"], "versions": [{"version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "lessThan": "c940d1b96248c3081b664ede5418078bdc7c8c07", "status": "affected", "versionType": "git"}, {"version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "lessThan": "12088da6add5b003657c8506c5b0fcef835083b8", "status": "affected", "versionType": "git"}, {"version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "lessThan": "c78bd5195a5998094a5866df702fbeafda60dafb", "status": "affected", "versionType": "git"}, {"version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "lessThan": "4a597a87e2e2f608edb6be2c510dc826b4fdfb53", "status": "affected", "versionType": "git"}, {"version": "5dd9488ae41070b69d2f4acb580f77db5705f9ca", "status": "affected", "versionType": "git"}, {"version": "a469bab3386aebff33c59506f3a95e35b91118fd", "status": "affected", "versionType": "git"}, {"version": "5.4.24", "lessThan": "5.5", "status": "affected", "versionType": "semver"}, {"version": "5.5.8", "lessThan": "5.6", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/ipset/ip_set_hash_gen.h"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "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", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c940d1b96248c3081b664ede5418078bdc7c8c07"}, {"url": "https://git.kernel.org/stable/c/12088da6add5b003657c8506c5b0fcef835083b8"}, {"url": "https://git.kernel.org/stable/c/c78bd5195a5998094a5866df702fbeafda60dafb"}, {"url": "https://git.kernel.org/stable/c/4a597a87e2e2f608edb6be2c510dc826b4fdfb53"}], "title": "netfilter: ipset: make sure gc is properly stopped", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72434", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:49:50.650584Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:23.726Z"}}]}}

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Dereferencing freed set, htype, and hash table memory from the GC workqueue can immediately trigger kernel oopses or panics, and the bug is repeatable on every destroy of a timeout hash ipset."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "lessThan": "c940d1b96248c3081b664ede5418078bdc7c8c07", "versionType": "git"}, {"status": "affected", "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "lessThan": "12088da6add5b003657c8506c5b0fcef835083b8", "versionType": "git"}, {"status": "affected", "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "lessThan": "c78bd5195a5998094a5866df702fbeafda60dafb", "versionType": "git"}, {"status": "affected", "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "lessThan": "4a597a87e2e2f608edb6be2c510dc826b4fdfb53", "versionType": "git"}, {"status": "affected", "version": "5dd9488ae41070b69d2f4acb580f77db5705f9ca", "versionType": "git"}, {"status": "affected", "version": "a469bab3386aebff33c59506f3a95e35b91118fd", "versionType": "git"}, {"status": "affected", "version": "5.4.24", "lessThan": "5.5", "versionType": "semver"}, {"status": "affected", "version": "5.5.8", "lessThan": "5.6", "versionType": "semver"}], "programFiles": ["net/netfilter/ipset/ip_set_hash_gen.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"status": "unaffected", "version": "0", "lessThan": "5.6", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/netfilter/ipset/ip_set_hash_gen.h"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/c940d1b96248c3081b664ede5418078bdc7c8c07"}, {"url": "https://git.kernel.org/stable/c/12088da6add5b003657c8506c5b0fcef835083b8"}, {"url": "https://git.kernel.org/stable/c/c78bd5195a5998094a5866df702fbeafda60dafb"}, {"url": "https://git.kernel.org/stable/c/4a597a87e2e2f608edb6be2c510dc826b4fdfb53"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: make sure gc is properly stopped\n\nSashiko noticed that when destroying a set,\ncancel_delayed_work_sync() was called while gc\ncalls queue_delayed_work() unconditionally which\ncan lead not to properly shutting down the gc."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.4.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.5.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:09.822Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72434", "state": "PUBLISHED", "dateUpdated": "2026-10-16T18:55:23.726Z", "dateReserved": "2026-08-09T03:40:39.929Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:56:48.756Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/ipset/ip_set_hash_gen.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c940d1b96248c3081b664ede5418078bdc7c8c07", "status": "affected", "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "versionType": "git"}, {"lessThan": "12088da6add5b003657c8506c5b0fcef835083b8", "status": "affected", "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "versionType": "git"}, {"lessThan": "c78bd5195a5998094a5866df702fbeafda60dafb", "status": "affected", "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "versionType": "git"}, {"lessThan": "4a597a87e2e2f608edb6be2c510dc826b4fdfb53", "status": "affected", "version": "f66ee0410b1c3481ee75e5db9b34547b4d582465", "versionType": "git"}, {"status": "affected", "version": "5dd9488ae41070b69d2f4acb580f77db5705f9ca", "versionType": "git"}, {"status": "affected", "version": "a469bab3386aebff33c59506f3a95e35b91118fd", "versionType": "git"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.24", "versionType": "semver"}, {"lessThan": "5.6", "status": "affected", "version": "5.5.8", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/netfilter/ipset/ip_set_hash_gen.h"], "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": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "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\nnetfilter: ipset: make sure gc is properly stopped\n\nSashiko noticed that when destroying a set,\ncancel_delayed_work_sync() was called while gc\ncalls queue_delayed_work() unconditionally which\ncan lead not to properly shutting down the gc."}], "id": "CVE-2026-72434", "lastModified": "2026-10-16T19:17:30.207", "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-2026-72434", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:49:50.650584Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:17.247", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/12088da6add5b003657c8506c5b0fcef835083b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4a597a87e2e2f608edb6be2c510dc826b4fdfb53"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c78bd5195a5998094a5866df702fbeafda60dafb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c940d1b96248c3081b664ede5418078bdc7c8c07"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: netfilter: ipset: make sure gc is properly stopped", "id": "2516290", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516290"}, "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: ipset: make sure gc is properly stopped\nSashiko noticed that when destroying a set,\ncancel_delayed_work_sync() was called while gc\ncalls queue_delayed_work() unconditionally which\ncan lead not to properly shutting down the gc.", "A flaw was found in the Linux kernel's netfilter ipset component. When destroying a set, the garbage collection (gc) mechanism may not be properly stopped due to an unconditional call to `queue_delayed_work()` while `cancel_delayed_work_sync()` is called. This improper shutdown can lead to resource exhaustion, potentially resulting in a Denial of Service (DoS) condition."], "name": "CVE-2026-72434", "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": "Out of support scope", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72434\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72434\nhttps://lore.kernel.org/linux-cve-announce/2026081528-CVE-2026-72434-9a76@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f66ee0410b1c3481ee75e5db9b34547b4d582465,c940d1b96248c3081b664ede5418078bdc7c8c07)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f66ee0410b1c3481ee75e5db9b34547b4d582465,12088da6add5b003657c8506c5b0fcef835083b8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f66ee0410b1c3481ee75e5db9b34547b4d582465,c78bd5195a5998094a5866df702fbeafda60dafb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f66ee0410b1c3481ee75e5db9b34547b4d582465,4a597a87e2e2f608edb6be2c510dc826b4fdfb53)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "5dd9488ae41070b69d2f4acb580f77db5705f9ca"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "a469bab3386aebff33c59506f3a95e35b91118fd"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.4.24,5.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.5.8,5.6)"}}], "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": "semver", "value": "5.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "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": "2026-08-15T19:15:03.345798+00:00", "updated": "2026-08-22T03:30:16.803540+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362", "CWE-821"]}