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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 996bfaa7372d6718b6d860bdf78f6618e850c702affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < f0982400648a3e00580253e0c48e991f34d2684caffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ebc0730b490c7f27340b1222e01dd106e820320daffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 86df8ade88d290725554cefd03101ecd0fbd3752affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 15ba9acafb0517f8359ca30002c189a68ddbb939affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2d1359e11674ed4274934eac8a71877ae5ae7bbbaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 3637d34b35b287ab830e66048841ace404382b67affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.4.302 to ≤ 5.4.*unaffected5.10.247 to ≤ 5.10.*unaffected5.15.197 to ≤ 5.15.*unaffected6.1.159 to ≤ 6.1.*unaffected6.6.117 to ≤ 6.6.*unaffected6.12.58 to ≤ 6.12.*unaffected6.17.8 to ≤ 6.17.*unaffected6.18 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/996bfaa7372d6718b6d860bdf78f6618e850c702 ↗
- https://git.kernel.org/stable/c/f0982400648a3e00580253e0c48e991f34d2684c ↗
- https://git.kernel.org/stable/c/1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1 ↗
- https://git.kernel.org/stable/c/ebc0730b490c7f27340b1222e01dd106e820320d ↗
- https://git.kernel.org/stable/c/86df8ade88d290725554cefd03101ecd0fbd3752 ↗
- https://git.kernel.org/stable/c/15ba9acafb0517f8359ca30002c189a68ddbb939 ↗
- https://git.kernel.org/stable/c/2d1359e11674ed4274934eac8a71877ae5ae7bbb ↗
- https://git.kernel.org/stable/c/3637d34b35b287ab830e66048841ace404382b67 ↗