Description
In the Linux kernel, the following vulnerability has been resolved: fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds Add bounds checking to prevent writes past framebuffer boundaries when rendering text near screen edges. Return early if the Y position is off-screen and clip image height to screen boundary. Break from the rendering loop if the X position is off-screen. When clipping image width to fit the screen, update the character count to match the clipped width to prevent buffer size mismatches. Without the character count update, bit_putcs_aligned and bit_putcs_unaligned receive mismatched parameters where the buffer is allocated for the clipped width but cnt reflects the original larger count, causing out-of-bounds writes.
Product status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 996bfaa7372d6718b6d860bdf78f6618e850c702
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before f0982400648a3e00580253e0c48e991f34d2684c
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before ebc0730b490c7f27340b1222e01dd106e820320d
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 86df8ade88d290725554cefd03101ecd0fbd3752
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 15ba9acafb0517f8359ca30002c189a68ddbb939
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 2d1359e11674ed4274934eac8a71877ae5ae7bbb
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 3637d34b35b287ab830e66048841ace404382b67
5.4.302 (semver)
5.10.247 (semver)
5.15.197 (semver)
6.1.159 (semver)
6.6.117 (semver)
6.12.58 (semver)
6.17.8 (semver)
6.18 (original_commit_for_fix)
References
git.kernel.org/...c/996bfaa7372d6718b6d860bdf78f6618e850c702
git.kernel.org/...c/f0982400648a3e00580253e0c48e991f34d2684c
git.kernel.org/...c/1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1
git.kernel.org/...c/ebc0730b490c7f27340b1222e01dd106e820320d
git.kernel.org/...c/86df8ade88d290725554cefd03101ecd0fbd3752
git.kernel.org/...c/15ba9acafb0517f8359ca30002c189a68ddbb939
git.kernel.org/...c/2d1359e11674ed4274934eac8a71877ae5ae7bbb
git.kernel.org/...c/3637d34b35b287ab830e66048841ace404382b67
