{"id":12364,"date":"2026-09-04T18:54:18","date_gmt":"2026-09-04T10:54:18","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80724"},"modified":"2026-09-04T18:54:18","modified_gmt":"2026-09-04T10:54:18","slug":"cve-2026-80724","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-80724","title":{"rendered":"CVE-2026-80724 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nptp: vmclock: prevent"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ptp: vmclock: prevent read-only mappings from becoming writable<\/p>\n<p>vmclock_miscdev_mmap() rejects writable mappings of the shared vmclock<br \/>\nABI page with -EROFS, but leaves VM_MAYWRITE set.  Userspace can map the<br \/>\npage read-only and then upgrade it to writable with mprotect(), after<br \/>\nwhich the guest can corrupt the host-written timekeeping data (sequence<br \/>\ncounter, UTC time, TSC offset) that the vmclock ABI defines as read-only.<\/p>\n<p>Clear VM_MAYWRITE on the read-only path so the mapping cannot be<br \/>\nupgraded, as i915 does for its read-only objects and as fixed in drm\/vc4<br \/>\n(CVE-2026-68445) and drm\/panthor (CVE-2024-53071).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ptp: vmclock: prevent read-only mappings from becoming writable<\/p>\n<p>vmclock_miscdev_mmap() rejects writable mappings of the shared vmc<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-12364","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/12364","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12364"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12364"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12364"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}