CVE-2026-80724

UNKNOWN 0.0

ptp: vmclock: prevent read-only mappings from becoming writable

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

In the Linux kernel, the following vulnerability has been resolved: ptp: vmclock: prevent read-only mappings from becoming writable vmclock_miscdev_mmap() 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).

Vendor	linux
Product	linux
Ecosystems	Linux Kernel
Industries	Technology
Published	Aug 28, 2026

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Affected Versions

Linux / Linux

20503272422693d793b84f88bf23fe4e955d3a33 < 5b4f2bec7bea6c04084d720d731bedee7caf878d 20503272422693d793b84f88bf23fe4e955d3a33 < 2496e141827102d6af512950057d402a2cfb2bfc 20503272422693d793b84f88bf23fe4e955d3a33 < 2e596e7814ba38cdc129991058b6c254ed37cb11

Linux / Linux

6.13

References

NVD ↗ CVE.org ↗ EPSS Data ↗

git.kernel.org: https://git.kernel.org/stable/c/5b4f2bec7bea6c04084d720d731bedee7caf878d git.kernel.org: https://git.kernel.org/stable/c/2496e141827102d6af512950057d402a2cfb2bfc git.kernel.org: https://git.kernel.org/stable/c/2e596e7814ba38cdc129991058b6c254ed37cb11