CVEvulnerability
CVE-2025-40322
7.1 HIGH
Official page ↗
- Status
- Deferred
- Published
- 2025-12-08
- Last modified
- 2026-10-14
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
- 7.1 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Description
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.
References
- https://git.kernel.org/stable/c/0998a6cb232674408a03e8561dc15aa266b2f53b git.kernel.org
- https://git.kernel.org/stable/c/18c4ef4e765a798b47980555ed665d78b71aeadf git.kernel.org
- https://git.kernel.org/stable/c/901f44227072be60812fe8083e83e1533c04eed1 git.kernel.org
- https://git.kernel.org/stable/c/9ba1a7802ca9a2590cef95b253e6526f4364477f git.kernel.org
- https://git.kernel.org/stable/c/a10cede006f9614b465cf25609a8753efbfd45cc git.kernel.org
- https://git.kernel.org/stable/c/c12003bf91fdff381c55ef54fef3e961a5af2545 git.kernel.org
- https://git.kernel.org/stable/c/db5c9a162d2f42bcc842b76b3d935dcc050a0eec git.kernel.org
- https://git.kernel.org/stable/c/efaf89a75a29b2d179bf4fe63ca62852e93ad620 git.kernel.org