{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-43331",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-01T14:12:56.002Z",
        "datePublished": "2026-05-08T13:31:18.787Z",
        "dateUpdated": "2026-06-19T11:58:29.321Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-19T11:58:29.321Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/kexec: Disable KCOV instrumentation after load_segments()\n\nThe load_segments() function changes segment registers, invalidating GS base\n(which KCOV relies on for per-cpu data). When CONFIG_KCOV is enabled, any\nsubsequent instrumented C code call (e.g. native_gdt_invalidate()) begins\ncrashing the kernel in an endless loop.\n\nTo reproduce the problem, it's sufficient to do kexec on a KCOV-instrumented\nkernel:\n\n  $ kexec -l /boot/otherKernel\n  $ kexec -e\n\nThe real-world context for this problem is enabling crash dump collection in\nsyzkaller. For this, the tool loads a panic kernel before fuzzing and then\ncalls makedumpfile after the panic. This workflow requires both CONFIG_KEXEC\nand CONFIG_KCOV to be enabled simultaneously.\n\nAdding safeguards directly to the KCOV fast-path (__sanitizer_cov_trace_pc())\nis also undesirable as it would introduce an extra performance overhead.\n\nDisabling instrumentation for the individual functions would be too fragile,\nso disable KCOV instrumentation for the entire machine_kexec_64.c and\nphysaddr.c. If coverage-guided fuzzing ever needs these components in the\nfuture, other approaches should be considered.\n\nThe problem is not relevant for 32 bit kernels as CONFIG_KCOV is not supported\nthere.\n\n  [ bp: Space out comment for better readability. ]"
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/kernel/Makefile",
                        "arch/x86/mm/Makefile"
                    ],
                    "versions": [
                        {
                            "version": "0d345996e4cb573f8cc81d49b3ee9a7fd2035bef",
                            "lessThan": "0e96cd314c0d819c1635d68125a4d77852c2162e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0d345996e4cb573f8cc81d49b3ee9a7fd2035bef",
                            "lessThan": "593d67032544b9271094fc9b43e437e017cb2b2f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0d345996e4cb573f8cc81d49b3ee9a7fd2035bef",
                            "lessThan": "1e3e98596c2769721ade0418434852fb3af4849a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0d345996e4cb573f8cc81d49b3ee9a7fd2035bef",
                            "lessThan": "de05c66fab8847237a9ca216934e56d3ee837f08",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0d345996e4cb573f8cc81d49b3ee9a7fd2035bef",
                            "lessThan": "917e3ad3321e75ca0223d5ccf26ceda116aa51e1",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/kernel/Makefile",
                        "arch/x86/mm/Makefile"
                    ],
                    "versions": [
                        {
                            "version": "6.6",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.6",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.143",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.93",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.22",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.12",
                            "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": "6.6",
                                    "versionEndExcluding": "6.6.143"
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                                    "versionStartIncluding": "6.6",
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/0e96cd314c0d819c1635d68125a4d77852c2162e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/593d67032544b9271094fc9b43e437e017cb2b2f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1e3e98596c2769721ade0418434852fb3af4849a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/de05c66fab8847237a9ca216934e56d3ee837f08"
                },
                {
                    "url": "https://git.kernel.org/stable/c/917e3ad3321e75ca0223d5ccf26ceda116aa51e1"
                }
            ],
            "title": "x86/kexec: Disable KCOV instrumentation after load_segments()",
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}