{"api_version":"1","generated_at":"2026-08-28T20:42:28+00:00","cve":"CVE-2026-80724","urls":{"html":"https://cve.report/CVE-2026-80724","api":"https://cve.report/api/cve/CVE-2026-80724.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80724","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80724"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:58","updated_at":"2026-08-28 08:16:58"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/5b4f2bec7bea6c04084d720d731bedee7caf878d","name":"https://git.kernel.org/stable/c/5b4f2bec7bea6c04084d720d731bedee7caf878d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2496e141827102d6af512950057d402a2cfb2bfc","name":"https://git.kernel.org/stable/c/2496e141827102d6af512950057d402a2cfb2bfc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2e596e7814ba38cdc129991058b6c254ed37cb11","name":"https://git.kernel.org/stable/c/2e596e7814ba38cdc129991058b6c254ed37cb11","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80724","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80724","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 20503272422693d793b84f88bf23fe4e955d3a33 5b4f2bec7bea6c04084d720d731bedee7caf878d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 20503272422693d793b84f88bf23fe4e955d3a33 2496e141827102d6af512950057d402a2cfb2bfc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 20503272422693d793b84f88bf23fe4e955d3a33 2e596e7814ba38cdc129991058b6c254ed37cb11 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.13","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.47 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.11 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.1 7.2.* semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/ptp/ptp_vmclock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5b4f2bec7bea6c04084d720d731bedee7caf878d","status":"affected","version":"20503272422693d793b84f88bf23fe4e955d3a33","versionType":"git"},{"lessThan":"2496e141827102d6af512950057d402a2cfb2bfc","status":"affected","version":"20503272422693d793b84f88bf23fe4e955d3a33","versionType":"git"},{"lessThan":"2e596e7814ba38cdc129991058b6c254ed37cb11","status":"affected","version":"20503272422693d793b84f88bf23fe4e955d3a33","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/ptp/ptp_vmclock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.13"},{"lessThan":"6.13","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.47","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.11","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.1","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.47","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.11","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.1","versionStartIncluding":"6.13","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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)."}],"providerMetadata":{"dateUpdated":"2026-08-28T07:03:08.410Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/5b4f2bec7bea6c04084d720d731bedee7caf878d"},{"url":"https://git.kernel.org/stable/c/2496e141827102d6af512950057d402a2cfb2bfc"},{"url":"https://git.kernel.org/stable/c/2e596e7814ba38cdc129991058b6c254ed37cb11"}],"title":"ptp: vmclock: prevent read-only mappings from becoming writable","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80724","datePublished":"2026-08-28T07:03:08.410Z","dateReserved":"2026-08-26T14:34:25.788Z","dateUpdated":"2026-08-28T07:03:08.410Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 08:16:58","lastModifiedDate":"2026-08-28 08:16:58","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80724","Ordinal":"1","Title":"ptp: vmclock: prevent read-only mappings from becoming writable","CVE":"CVE-2026-80724","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80724","Ordinal":"1","NoteData":"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).","Type":"Description","Title":"ptp: vmclock: prevent read-only mappings from becoming writable"}]}}}