{"id":"CVE-2026-80724","revision":null,"records":[{"revision":"e80179f4121a41a2a284e824b494ff79","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80724","aliases":[],"title":"ptp: vmclock: prevent read-only mappings from becoming writable","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nptp: vmclock: prevent read-only mappings from becoming writable\n\nvmclock_miscdev_mmap() rejects writable mappings of the shared vmclock\nABI page with -EROFS, but leaves VM_MAYWRITE set. Userspace can map the\npage read-only and then upgrade it to writable with mprotect(), after\nwhich the guest can corrupt the host-written timekeeping data (sequence\ncounter, UTC time, TSC offset) that the vmclock ABI defines as read-only.\n\nClear VM_MAYWRITE on the read-only path so the mapping cannot be\nupgraded, as i915 does for its read-only objects and as fixed in drm/vc4\n(CVE-2026-68445) and drm/panthor (CVE-2024-53071).","state":0,"publishedAt":"2026-08-28T07:03:08.41+00:00","modifiedAt":"2026-10-19T08:43:13.41+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/ptp/ptp_vmclock.c\"\n ],\n \"versions\": [\n {\n \"version\": \"20503272422693d793b84f88bf23fe4e955d3a33\",\n \"lessThan\": \"5b4f2bec7bea6c04084d720d731bedee7caf878d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"20503272422693d793b84f88bf23fe4e955d3a33\",\n \"lessThan\": \"3f5677d2f817355147337f0453174c7bb0f3b66a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"20503272422693d793b84f88bf23fe4e955d3a33\",\n \"lessThan\": \"2496e141827102d6af512950057d402a2cfb2bfc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"20503272422693d793b84f88bf23fe4e955d3a33\",\n \"lessThan\": \"2e596e7814ba38cdc129991058b6c254ed37cb11\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"20503272422693d793b84f88bf23fe4e955d3a33\",\n \"lessThan\": \"0ce59c4148ecd1520c5592a63bb3c8991ee2d326\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"20503272422693d793b84f88bf23fe4e955d3a33\",\n \"lessThan\": \"a5edadbae57e2298a56cf7a4e774a027905a331f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/ptp/ptp_vmclock.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.13\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.13\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.47\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.50\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.11\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.1\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.4\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/5b4f2bec7bea6c04084d720d731bedee7caf878d","https://git.kernel.org/stable/c/3f5677d2f817355147337f0453174c7bb0f3b66a","https://git.kernel.org/stable/c/2496e141827102d6af512950057d402a2cfb2bfc","https://git.kernel.org/stable/c/2e596e7814ba38cdc129991058b6c254ed37cb11","https://git.kernel.org/stable/c/0ce59c4148ecd1520c5592a63bb3c8991ee2d326","https://git.kernel.org/stable/c/a5edadbae57e2298a56cf7a4e774a027905a331f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80724","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80724","identifiers":["CVE-2026-80724"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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