CVE-2026-80724high

CVE-2026-80724: high-severity vulnerability in Linux

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

Published · Updated

41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 8.8epss 0.2%
from disclosure to weapon2 days
Published on NVDAug 28
1st PoC+2d
exploitation probability
0.2%top 93% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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).
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Linux · Linux
public PoCs found — 1
githubgithub.com/suruurism/cve-writeups-and-pocs★ 1
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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References
https://git.kernel.org/stable/c/0ce59c4148ecd1520c5592a63bb3c8991ee2d326https://git.kernel.org/stable/c/2496e141827102d6af512950057d402a2cfb2bfchttps://git.kernel.org/stable/c/2e596e7814ba38cdc129991058b6c254ed37cb11https://git.kernel.org/stable/c/3f5677d2f817355147337f0453174c7bb0f3b66ahttps://git.kernel.org/stable/c/5b4f2bec7bea6c04084d720d731bedee7caf878dhttps://git.kernel.org/stable/c/a5edadbae57e2298a56cf7a4e774a027905a331f