CVE-2026-68255

Summary

In the Linux kernel, the following vulnerability has been resolved:

drm/virtio: bound EDID block reads to the response buffer

virtio_get_edid_block() validates the read offset only against the device-supplied resp->size field, never against the fixed-size resp->edid array. The EDID block index is driven by the device-supplied extension count, so a malicious virtio-gpu backend can advertise a large size together with a high block count and read far past the array into adjacent kernel memory, which is then surfaced in the parsed EDID (an out-of-bounds read / info leak).

Also reject any read whose end exceeds the size of the edid array. Conforming EDID responses stay within the array and are unaffected.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb4b01b4995fb15b55a2d067eb405917f5ab32709 < 9fc2a017c5d597937e0c28b9a9669844aa796c42affected
LinuxLinuxb4b01b4995fb15b55a2d067eb405917f5ab32709 < 2757e6e803092cf0aeaf4b735e16b5d3bdc705c5affected
LinuxLinuxb4b01b4995fb15b55a2d067eb405917f5ab32709 < 35be0e2c6862abcd5e5f5445261f1fd910d4a9b4affected
LinuxLinuxb4b01b4995fb15b55a2d067eb405917f5ab32709 < 375c1934ef0196d3b6d3a1eae3232bef8dae7bf7affected
LinuxLinuxb4b01b4995fb15b55a2d067eb405917f5ab32709 < 4e1a53892ba7f8a3e1da6bfc53c83ae7c812dccdaffected
LinuxLinux5.0affected
LinuxLinux0 < 5.0unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2-rc2 <= *unaffected

Weaknesses

References