CVE-2026-90245

Summary

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

fbdev: kyro: Validate overlay viewport coordinates

The overlay viewport end coordinates are computed from the viewport origin and dimensions using 32-bit unsigned arithmetic. Large input values can cause these calculations to wrap around before the resulting coordinates are passed to SetOverlayViewPort().

SetOverlayViewPort() packs the viewport coordinates into 16-bit register fields. The X coordinates are additionally adjusted by +2 and +1 before being written. Validate the coordinate calculations for 32-bit wraparound and ensure that the adjusted coordinates fit within their 16-bit register fields before calling SetOverlayViewPort().

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d8c1a9579cbd8f4ac5cbd5a10f1afb5ee64adf30affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2ac6e30a552e6f9932c21c865a5c69f40c8aef64affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 413d763439ba68e5d547538e6b6c7de97d5818a5affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e8d4e4cf388daeb49704f3de10b203034f28eb90affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a6decd4e72fc5846d3b268bd085a2089213fd5eeaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 33e54e3e0b2ca959304e62c3d84f0ad49bbe1afeaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7bf36dc23bcf3496dec274a46ae0aaff4961ea03affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7b5c7bc55e13e7f5ac7b1eaf5c6d690389ea5ee3affected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References