{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-43321",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-01T14:12:56.001Z",
        "datePublished": "2026-05-08T13:26:15.600Z",
        "dateUpdated": "2026-08-05T12:27:12.004Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:27:12.004Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Properly mark live registers for indirect jumps\n\nFor a `gotox rX` instruction the rX register should be marked as used\nin the compute_insn_live_regs() function. 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"
            }
        }
    }
}