CVE-2026-43116

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Expand the existing spinlock\nsection to address this to cover the expectation lookup. Note that,\nthe nf_ct_expect_iterate_net() calls already grabs the spinlock while\niterating over the expectation table, which is correct.\n\nThe get expectation command needs to grab the spinlock to ensure master\nconntrack does not go away. This also expands the existing spinlock\nsection to cover the expectation lookup too. I needed to move the\nnetlink skb allocation out of the spinlock to keep it GFP_KERNEL.\n\nFor the expectation events, the IPEXP_DESTROY event is already delivered\nunder the spinlock, just move the delivery of IPEXP_NEW under the\nspinlock too because the master conntrack event cache is reached through\nexp->master.\n\nWhile at it, add lockdep notations to help identify what codepaths need\nto grab the spinlock."}], "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 ctnetlink expectation operations are reached through NETLINK_NETFILTER messages from local userspace, not directly by remote packets.\nAC:L - The race is between attacker-driven ctnetlink expectation lookup/dump/delete and attacker-driven master conntrack deletion or timeout, so the attacker can create and retry both sides.\nPR:L - nfnetlink requires CAP_NET_ADMIN in the target network namespace, and an unprivileged local user can reasonably obtain that via a user plus network namespace on affected deployments.\nUI:N - No victim action is required after the attacker can send the netlink requests.\nS:U - This is a kernel memory safety issue within the same host security authority and does not cross a VM, IOMMU, or similar scope boundary.\nC:H - The bug is a use-after-free of the master struct nf_conn reachable from a retained expectation, and kernel UAFs can be leveraged for disclosure of sensitive kernel memory.\nI:H - The stale master pointer is kernel heap memory corruption/use-after-free, which is defensibly exploitable for control-flow or data modification with heap grooming.\nA:H - Even without full exploitation, dereferencing the freed master conntrack can trigger a kernel oops or panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"497f99b26fffdc5635706d1b4811f1ed8ee21a5b", "status": "affected", "versionType": "git"}, {"version": "c1d10adb4a521de5760112853f42aaeefcec96eb", "lessThan": "bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/netfilter/nf_conntrack_core.h", "net/netfilter/nf_conntrack_ecache.c", "net/netfilter/nf_conntrack_expect.c", "net/netfilter/nf_conntrack_netlink.c"], "versions": [{"version": "2.6.16", "status": "affected"}, {"version": "0", "lessThan": "2.6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.14", "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": "2.6.16", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", 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The vulnerable ctnetlink expectation operations are reached through NETLINK_NETFILTER messages from local userspace, not directly by remote packets.\nAC:L - The race is between attacker-driven ctnetlink expectation lookup/dump/delete and attacker-driven master conntrack deletion or timeout, so the attacker can create and retry both sides.\nPR:L - nfnetlink requires CAP_NET_ADMIN in the target network namespace, and an unprivileged local user can reasonably obtain that via a user plus network namespace on affected deployments.\nUI:N - No victim action is required after the attacker can send the netlink requests.\nS:U - This is a kernel memory safety issue within the same host security authority and does not cross a VM, IOMMU, or similar scope boundary.\nC:H - The bug is a use-after-free of the master struct nf_conn reachable from a retained expectation, and kernel UAFs can be leveraged for disclosure of sensitive kernel memory.\nI:H - The stale master pointer is kernel heap memory corruption/use-after-free, which is defensibly exploitable for control-flow or data modification with heap grooming.\nA:H - Even without full exploitation, dereferencing the freed master conntrack can trigger a kernel oops or panic."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c1d10adb4a521de5760112853f42aaeefcec96eb", "lessThan": "9e1196d27ef496f404c76f7a9d03761142d991c4", "versionType": "git"}, {"status": "affected", "version": "c1d10adb4a521de5760112853f42aaeefcec96eb", "lessThan": "5e1c1d22268ae710c238342c8030c21daf298168", "versionType": "git"}, {"status": "affected", "version": "c1d10adb4a521de5760112853f42aaeefcec96eb", "lessThan": "d52fa1fa7440676b8c238037a050ab008c22737f", "versionType": "git"}, {"status": "affected", "version": "c1d10adb4a521de5760112853f42aaeefcec96eb", "lessThan": "f338ced0473849c9f6ed0b77ca99f1aab5826787", "versionType": "git"}, {"status": "affected", "version": "c1d10adb4a521de5760112853f42aaeefcec96eb", "lessThan": "497f99b26fffdc5635706d1b4811f1ed8ee21a5b", "versionType": "git"}, {"status": "affected", "version": "c1d10adb4a521de5760112853f42aaeefcec96eb", "lessThan": "bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5", "versionType": "git"}], "programFiles": ["include/net/netfilter/nf_conntrack_core.h", "net/netfilter/nf_conntrack_ecache.c", "net/netfilter/nf_conntrack_expect.c", "net/netfilter/nf_conntrack_netlink.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.16"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.16", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.94", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.24", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.14", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["include/net/netfilter/nf_conntrack_core.h", "net/netfilter/nf_conntrack_ecache.c", "net/netfilter/nf_conntrack_expect.c", "net/netfilter/nf_conntrack_netlink.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/9e1196d27ef496f404c76f7a9d03761142d991c4"}, {"url": "https://git.kernel.org/stable/c/5e1c1d22268ae710c238342c8030c21daf298168"}, {"url": "https://git.kernel.org/stable/c/d52fa1fa7440676b8c238037a050ab008c22737f"}, {"url": "https://git.kernel.org/stable/c/f338ced0473849c9f6ed0b77ca99f1aab5826787"}, {"url": "https://git.kernel.org/stable/c/497f99b26fffdc5635706d1b4811f1ed8ee21a5b"}, {"url": "https://git.kernel.org/stable/c/bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: ensure safe access to master conntrack\n\nHolding reference on the expectation is not sufficient, the master\nconntrack object can just go away, making exp->master invalid.\n\nTo access exp->master safely:\n\n- Grab the nf_conntrack_expect_lock, this gets serialized with\n clean_from_lists() which also holds this lock when the master\n conntrack goes away.\n\n- Hold reference on master conntrack via nf_conntrack_find_get().\n Not so easy since the master tuple to look up for the master conntrack\n is not available in the existing problematic paths.\n\nThis patch goes for extending the nf_conntrack_expect_lock section\nto address this issue for simplicity, in the cases that are described\nbelow this is just slightly extending the lock section.\n\nThe add expectation command already holds a reference to the master\nconntrack from ctnetlink_create_expect().\n\nHowever, the delete expectation command needs to grab the spinlock\nbefore looking up for the expectation. Expand the existing spinlock\nsection to address this to cover the expectation lookup. Note that,\nthe nf_ct_expect_iterate_net() calls already grabs the spinlock while\niterating over the expectation table, which is correct.\n\nThe get expectation command needs to grab the spinlock to ensure master\nconntrack does not go away. This also expands the existing spinlock\nsection to cover the expectation lookup too. I needed to move the\nnetlink skb allocation out of the spinlock to keep it GFP_KERNEL.\n\nFor the expectation events, the IPEXP_DESTROY event is already delivered\nunder the spinlock, just move the delivery of IPEXP_NEW under the\nspinlock too because the master conntrack event cache is reached through\nexp->master.\n\nWhile at it, add lockdep notations to help identify what codepaths need\nto grab the spinlock."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "2.6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "2.6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.94", "versionStartIncluding": "2.6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.24", "versionStartIncluding": "2.6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.14", "versionStartIncluding": "2.6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "2.6.16"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:02.836Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43116", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:46:35.383Z", "dateReserved": "2026-05-01T14:12:55.986Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-06T07:40:41.185Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Expand the existing spinlock\nsection to address this to cover the expectation lookup. Note that,\nthe nf_ct_expect_iterate_net() calls already grabs the spinlock while\niterating over the expectation table, which is correct.\n\nThe get expectation command needs to grab the spinlock to ensure master\nconntrack does not go away. This also expands the existing spinlock\nsection to cover the expectation lookup too. I needed to move the\nnetlink skb allocation out of the spinlock to keep it GFP_KERNEL.\n\nFor the expectation events, the IPEXP_DESTROY event is already delivered\nunder the spinlock, just move the delivery of IPEXP_NEW under the\nspinlock too because the master conntrack event cache is reached through\nexp->master.\n\nWhile at it, add lockdep notations to help identify what codepaths need\nto grab the spinlock."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: ctnetlink: asegurar acceso seguro a conntrack maestro\n\nMantener una referencia sobre la expectativa no es suficiente, el objeto conntrack maestro puede simplemente desaparecer, haciendo que exp -> master sea inv\u00e1lido.\n\nPara acceder a exp -> master de forma segura:\n\n- Adquirir el nf_conntrack_expect_lock, esto se serializa con clean_from_lists() que tambi\u00e9n mantiene este bloqueo cuando el conntrack maestro desaparece.\n\n- Mantener una referencia sobre el conntrack maestro a trav\u00e9s de nf_conntrack_find_get(). No es tan f\u00e1cil ya que la tupla maestra para buscar el conntrack maestro no est\u00e1 disponible en las rutas problem\u00e1ticas existentes.\n\nEste parche opta por extender la secci\u00f3n nf_conntrack_expect_lock para abordar este problema por simplicidad; en los casos que se describen a continuaci\u00f3n, esto solo extiende ligeramente la secci\u00f3n de bloqueo.\n\nEl comando de a\u00f1adir expectativa ya mantiene una referencia al conntrack maestro desde ctnetlink_create_expect().\n\nSin embargo, el comando de eliminar expectativa necesita adquirir el spinlock antes de buscar la expectativa. Expandir la secci\u00f3n de spinlock existente para abordar esto y cubrir la b\u00fasqueda de la expectativa. Tenga en cuenta que las llamadas a nf_ct_expect_iterate_net() ya adquieren el spinlock mientras iteran sobre la tabla de expectativas, lo cual es correcto.\n\nEl comando de obtener expectativa necesita adquirir el spinlock para asegurar que el conntrack maestro no desaparezca. Esto tambi\u00e9n expande la secci\u00f3n de spinlock existente para cubrir tambi\u00e9n la b\u00fasqueda de la expectativa. Necesit\u00e9 mover la asignaci\u00f3n de netlink skb fuera del spinlock para mantenerla GFP_KERNEL.\n\nPara los eventos de expectativa, el evento IPEXP_DESTROY ya se entrega bajo el spinlock; simplemente mueva la entrega de IPEXP_NEW tambi\u00e9n bajo el spinlock porque la cach\u00e9 de eventos del conntrack maestro se alcanza a trav\u00e9s de exp -> master.\n\nYa que estamos, a\u00f1ada anotaciones de lockdep para ayudar a identificar qu\u00e9 rutas de c\u00f3digo necesitan adquirir el spinlock."}], "id": "CVE-2026-43116", "lastModified": "2026-11-11T21:10:00.200", "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-2026-43116", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:14:47.387968Z", "version": "2.0.3"}}]}, "published": "2026-05-06T10:16:25.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/497f99b26fffdc5635706d1b4811f1ed8ee21a5b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5e1c1d22268ae710c238342c8030c21daf298168"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9e1196d27ef496f404c76f7a9d03761142d991c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d52fa1fa7440676b8c238037a050ab008c22737f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f338ced0473849c9f6ed0b77ca99f1aab5826787"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "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: ctnetlink: ensure safe access to master conntrack", "id": "2467005", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467005"}, "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-366", "details": ["A flaw was found in the `netfilter: ctnetlink` component of the Linux kernel. This vulnerability occurs due to insufficient locking when accessing the master conntrack object, allowing it to become invalid while still being referenced. A local attacker could potentially exploit this race condition, leading to a system crash and a denial of service."], "name": "CVE-2026-43116", "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": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "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": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43116\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43116\nhttps://lore.kernel.org/linux-cve-announce/2026050626-CVE-2026-43116-08a5@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,f338ced0473849c9f6ed0b77ca99f1aab5826787)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,497f99b26fffdc5635706d1b4811f1ed8ee21a5b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5)"}}], "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": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.24,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.14,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-05-06T11:45:03.028212+00:00", "updated": "2026-05-08T20:15:15.772112+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}