In the Linux kernel, the following vulnerability has been resolved:
xen: speed up grant-table reclaim
When a grant entry is still in use by the remote domain, Linux must put it on a deferred list. Normally, this list is very short, because the PV network and block protocols expect the backend to unmap the grant first. However, Qubes OS's GUI protocol is subject to the constraints of the X Window System, and as such winds up with the frontend unmapping the window first. As a result, the list can grow very large, resulting in a massive memory leak and eventual VM freeze.
To partially solve this problem, make the number of entries that the VM will attempt to free at each iteration tunable. The default is still 10, but it can be overridden via a module parameter.
This is Cc: stable because (when combined with appropriate userspace changes) it fixes a severe performance and stability problem for Qubes OS users.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade bpftoolUpgrade kernel-libbpf-staticUpgrade python3-perf-debuginfoUpgrade perfUpgrade kernel-develUpgrade python3-perfUpgrade kernel-tools-develUpgrade kernel-toolsUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-debuginfoUpgrade kernel-livepatch-6.1.49-69.116Upgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade kernel-libbpf-develUpgrade kernelUpgrade kernel-headersUpgrade perf-debuginfoUpgrade kernel-libbpfUpgrade kernel-debuginfo | Feb 20, 2026 | Dec 24, 2025 |
| Debian | — | Upgrade linux | Dec 29, 2025 | Dec 29, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 24, 2025 |
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