vulnerability
Red Hat: CVE-2025-40322: kernel: Linux kernel: Information disclosure and denial of service via out-of-bounds read in font glyph handling (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:L/AC:L/Au:S/C:C/I:N/A:C) | Dec 8, 2025 | Feb 3, 2026 | Feb 10, 2026 |
Severity
6
CVSS
(AV:L/AC:L/Au:S/C:C/I:N/A:C)
Published
Dec 8, 2025
Added
Feb 3, 2026
Modified
Feb 10, 2026
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.
Solutions
redhat-upgrade-kernelredhat-upgrade-kernel-rt
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