187 lines
9.3 KiB
JSON
187 lines
9.3 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-43331",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-01T14:12:56.002Z",
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"datePublished": "2026-05-08T13:31:18.787Z",
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"dateUpdated": "2026-06-19T11:58:29.321Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-06-19T11:58:29.321Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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. ]"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/x86/kernel/Makefile",
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"arch/x86/mm/Makefile"
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],
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"version": "0d345996e4cb573f8cc81d49b3ee9a7fd2035bef",
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"lessThan": "0e96cd314c0d819c1635d68125a4d77852c2162e",
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"status": "affected",
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"versionType": "git"
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{
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"version": "0d345996e4cb573f8cc81d49b3ee9a7fd2035bef",
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"status": "affected",
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{
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"lessThan": "1e3e98596c2769721ade0418434852fb3af4849a",
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"status": "affected",
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{
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"version": "0d345996e4cb573f8cc81d49b3ee9a7fd2035bef",
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"status": "affected",
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{
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"version": "0d345996e4cb573f8cc81d49b3ee9a7fd2035bef",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/x86/kernel/Makefile",
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"arch/x86/mm/Makefile"
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],
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"versions": [
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{
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"version": "6.6",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.6",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.143",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.93",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.22",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.19.12",
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"lessThanOrEqual": "6.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/0e96cd314c0d819c1635d68125a4d77852c2162e"
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},
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{
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"url": "https://git.kernel.org/stable/c/593d67032544b9271094fc9b43e437e017cb2b2f"
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},
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{
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"url": "https://git.kernel.org/stable/c/1e3e98596c2769721ade0418434852fb3af4849a"
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},
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{
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"url": "https://git.kernel.org/stable/c/de05c66fab8847237a9ca216934e56d3ee837f08"
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},
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{
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"url": "https://git.kernel.org/stable/c/917e3ad3321e75ca0223d5ccf26ceda116aa51e1"
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}
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],
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"title": "x86/kexec: Disable KCOV instrumentation after load_segments()",
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} |