CVE-2025-40322
fbdev: bitblit: bound-check glyph index in bit_putcs*
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
In the Linux kernel, the following vulnerability has been resolved: fbdev: bitblit: bound-check glyph index in bit_putcs* bit_putcs_aligned()/unaligned() derived the glyph pointer from the character value masked by 0xff/0x1ff, which may exceed the actual font's glyph count and read past the end of the built-in font array. Clamp the index to the actual glyph count before computing the address. This fixes a global out-of-bounds read reported by syzbot.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Dec 8, 2025 |
| Last Updated | May 11, 2026 |
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Affected Versions
Linux / Linux
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a10cede006f9614b465cf25609a8753efbfd45cc 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0998a6cb232674408a03e8561dc15aa266b2f53b 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < db5c9a162d2f42bcc842b76b3d935dcc050a0eec 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c12003bf91fdff381c55ef54fef3e961a5af2545 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9ba1a7802ca9a2590cef95b253e6526f4364477f 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 901f44227072be60812fe8083e83e1533c04eed1 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < efaf89a75a29b2d179bf4fe63ca62852e93ad620 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 18c4ef4e765a798b47980555ed665d78b71aeadf
Linux / Linux
2.6.12
References
git.kernel.org: https://git.kernel.org/stable/c/a10cede006f9614b465cf25609a8753efbfd45cc git.kernel.org: https://git.kernel.org/stable/c/0998a6cb232674408a03e8561dc15aa266b2f53b git.kernel.org: https://git.kernel.org/stable/c/db5c9a162d2f42bcc842b76b3d935dcc050a0eec git.kernel.org: https://git.kernel.org/stable/c/c12003bf91fdff381c55ef54fef3e961a5af2545 git.kernel.org: https://git.kernel.org/stable/c/9ba1a7802ca9a2590cef95b253e6526f4364477f git.kernel.org: https://git.kernel.org/stable/c/901f44227072be60812fe8083e83e1533c04eed1 git.kernel.org: https://git.kernel.org/stable/c/efaf89a75a29b2d179bf4fe63ca62852e93ad620 git.kernel.org: https://git.kernel.org/stable/c/18c4ef4e765a798b47980555ed665d78b71aeadf