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CVE-2026-80724

8.8 · HIGH

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…

Published Aug 28, 2026EPSS 0.18%

Overview

CVE-2026-80724 is a high-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2496e141827102d6af512950057d402a2cfb2bfcRefgit.kernel.org/stable/c/2e596e7814ba38cdc129991058b6c254ed37cb11Refgit.kernel.org/stable/c/5b4f2bec7bea6c04084d720d731bedee7caf878d

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80724?

CVE-2026-80724 is a high-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-80724?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-80724?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-80724?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80724 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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