In the Linux kernel, the following vulnerability has been resolved:
virtio_console: do not free control-out buffers on remove
__send_control_msg() publishes &portdev->cpkt as the control-out virtqueue cookie. remove_vqs() walks every virtqueue and passes leftover cookies to free_buf(), which treats them as struct port_buffer and reads sgpages.
If a control message is still on c_ovq when the device is unbound, free_buf() reads past the ports_device object.
KASAN reported slab-out-of-bounds in free_buf():
free_buf remove_vqs virtcons_remove unbind_store
The object was the ports_device allocated in virtcons_probe().
Drain c_ovq without freeing. The packet lives in portdev and is released with it.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade python3-perf6.12-debuginfoUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-toolsUpgrade kernel6.12-modules-extraUpgrade bpftool6.12-debuginfoUpgrade bpftool6.12Upgrade kernel6.12-modules-extra-commonUpgrade kernel-livepatch-6.12.111-136.204Upgrade kernel6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade perf6.12-debuginfoUpgrade python3-perf6.12Upgrade kernel6.12-tools-develUpgrade kernel6.12-develUpgrade kernel6.12-headersUpgrade kernel6.12-debuginfoUpgrade perf6.12Upgrade kernel6.12-debuginfo-common-x86_64 | Oct 13, 2026 | Sep 25, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Sep 30, 2026 | Sep 25, 2026 |
| Redhat_linux | — | No solution exists | Oct 1, 2026 | Sep 25, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 13, 2026 | Sep 25, 2026 |
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