CVE-2026-43321

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Fix this."}], "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 verifier path is reached by a local caller through the bpf() syscall with BPF_PROG_LOAD and BPF_MAP_TYPE_INSN_ARRAY setup. It is not reachable directly from network packets or a remote protocol.\nAC:L - An attacker who can load the relevant BPF program can craft bytecode and jump-table contents to reach the faulty liveness/pruning behavior without a race or victim-dependent state. The bug is deterministic verifier logic.\nPR:L - Loading the needed BPF objects is privilege-gated, but CAP_BPF/BPF-token delegated environments and namespace-based BPF delegation make this reachable by a low-privileged local attacker in reasonable deployments. Under the required tie-break rule, this is scored as low rather than high privileges.\nUI:N - No victim action is required after the attacker invokes the local BPF syscalls. The attacker supplies the program and map contents directly.\nS:U - Successful exploitation compromises the kernel in the same security authority as the vulnerable verifier. This is standard local kernel privilege escalation, not a VM or IOMMU boundary escape.\nC:H - The missing live-register mark can make verifier state pruning ignore the indirect-jump target register, potentially admitting unsafe BPF execution paths. Verifier unsoundness of this kind can be leveraged for arbitrary kernel memory disclosure.\nI:H - If an unsafe BPF program is accepted, the attacker can plausibly obtain arbitrary kernel memory write or control-flow primitives. This supports full kernel integrity compromise.\nA:H - Even without full exploitation, an accepted unsafe BPF program can corrupt kernel memory or execute invalid accesses and crash or panic the kernel. Availability impact is therefore high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "493d9e0d608339a32f568504d5fd411a261bb0af", "lessThan": "7beae54111c34ca63357ef120e115889b915beb5", "status": "affected", "versionType": "git"}, {"version": "493d9e0d608339a32f568504d5fd411a261bb0af", "lessThan": "d1aab1ca576c90192ba961094d51b0be6355a4d6", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/verifier.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.6", "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": "6.19", "versionEndExcluding": "6.19.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7beae54111c34ca63357ef120e115889b915beb5"}, {"url": "https://git.kernel.org/stable/c/d1aab1ca576c90192ba961094d51b0be6355a4d6"}], "title": "bpf: Properly mark live registers for indirect jumps", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43321", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:16:22.780603Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-682", "description": "CWE-682 Incorrect Calculation"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:16:26.326Z"}}]}}

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Fix this."}], "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 verifier path is reached by a local caller through the bpf() syscall with BPF_PROG_LOAD and BPF_MAP_TYPE_INSN_ARRAY setup. It is not reachable directly from network packets or a remote protocol.\nAC:L - An attacker who can load the relevant BPF program can craft bytecode and jump-table contents to reach the faulty liveness/pruning behavior without a race or victim-dependent state. The bug is deterministic verifier logic.\nPR:L - Loading the needed BPF objects is privilege-gated, but CAP_BPF/BPF-token delegated environments and namespace-based BPF delegation make this reachable by a low-privileged local attacker in reasonable deployments. Under the required tie-break rule, this is scored as low rather than high privileges.\nUI:N - No victim action is required after the attacker invokes the local BPF syscalls. The attacker supplies the program and map contents directly.\nS:U - Successful exploitation compromises the kernel in the same security authority as the vulnerable verifier. This is standard local kernel privilege escalation, not a VM or IOMMU boundary escape.\nC:H - The missing live-register mark can make verifier state pruning ignore the indirect-jump target register, potentially admitting unsafe BPF execution paths. Verifier unsoundness of this kind can be leveraged for arbitrary kernel memory disclosure.\nI:H - If an unsafe BPF program is accepted, the attacker can plausibly obtain arbitrary kernel memory write or control-flow primitives. 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{"bugzilla": {"description": "kernel: bpf: Properly mark live registers for indirect jumps", "id": "2468047", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468047"}, "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-372", "details": ["A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) subsystem. This vulnerability arises from the kernel's failure to correctly identify and mark active registers during indirect jump operations within the BPF program execution. An attacker could potentially exploit this to manipulate the kernel's state, leading to unexpected system behavior or a bypass of security controls, which may result in information disclosure."], "name": "CVE-2026-43321", "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": "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": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43321\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43321\nhttps://lore.kernel.org/linux-cve-announce/2026050819-CVE-2026-43321-6554@gregkh/T"], "threat_severity": "Moderate"}

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