CVE-2025-40322
fbdev: bitblit: bound-check glyph index in bit_putcs*
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
2.6.12
References 8
git.kernel.org
- stable/c/a10cede006f9614b465cf25609a8753efbfd45cc
- stable/c/0998a6cb232674408a03e8561dc15aa266b2f53b
- stable/c/db5c9a162d2f42bcc842b76b3d935dcc050a0eec
- stable/c/c12003bf91fdff381c55ef54fef3e961a5af2545
- stable/c/9ba1a7802ca9a2590cef95b253e6526f4364477f
- stable/c/901f44227072be60812fe8083e83e1533c04eed1
- stable/c/efaf89a75a29b2d179bf4fe63ca62852e93ad620
- stable/c/18c4ef4e765a798b47980555ed665d78b71aeadf