CVE-2026-80724
- Source
- https://cve.org/CVERecord?id=CVE-2026-80724
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80724.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-80724
- Downstream
- Published
- 2026-08-28T07:03:08.410Z
- Modified
- 2026-08-29T03:47:17.235580538Z
- Summary
- ptp: vmclock: prevent read-only mappings from becoming writable
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
ptp: vmclock: prevent read-only mappings from becoming writable
vmclockmiscdevmmap() rejects writable mappings of the shared vmclock ABI page with -EROFS, but leaves VM_MAYWRITE set. Userspace can map the page read-only and then upgrade it to writable with mprotect(), after which the guest can corrupt the host-written timekeeping data (sequence counter, UTC time, TSC offset) that the vmclock ABI defines as read-only.
Clear VM_MAYWRITE on the read-only path so the mapping cannot be upgraded, as i915 does for its read-only objects and as fixed in drm/vc4 (CVE-2026-68445) and drm/panthor (CVE-2024-53071).
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80724.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/2496e141827102d6af512950057d402a2cfb2bfc
- https://git.kernel.org/stable/c/2e596e7814ba38cdc129991058b6c254ed37cb11
- https://git.kernel.org/stable/c/5b4f2bec7bea6c04084d720d731bedee7caf878d
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80724.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-80724