linux: In the Linux kernel, the following vulnerability has been resolved: ptp: vmclock: prevent read-only mappings from be...
CVE-2026-80724 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-80724, released September 4, 2026. It is not reported as exploited. Patch Radar priority: 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 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).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bpftool6.18 · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| bpftool6.18-debuginfo · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel-livepatch-6.18.48-107.148 · amzn 2023 | 1:1.0-0.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18 · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18-debuginfo · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18-debuginfo-common-aarch64 · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18-debuginfo-common-x86_64 · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18-devel · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18-headers · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18-modules-extra · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18-modules-extra-common · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18-tools · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18-tools-debuginfo · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| kernel6.18-tools-devel · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| linux · Debian 14 | 7.1.12-1 | DEBIAN-CVE-2026-80724 | Sep 4, 2026 |
| microvm-kernel6.18 · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| perf6.18 · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| perf6.18-debuginfo · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| python3-perf6.18 · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
| python3-perf6.18-debuginfo · amzn 2023 | 1:6.18.48-107.148.amzn2023 | ALAS2023-2026-3139 | Sep 28, 2026 |
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