CVE-2025-40322
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.
Affected versions
Linux kernel versions
2.6.12
and later are affected. Fixed in
5.4.302,
5.10.247,
5.15.197,
6.1.159,
6.6.117,
6.12.58,
6.17.8,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40322 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/0998a6cb232674408a03e8561dc15aa266b2f53b
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PatchKernel patch commithttps://git.kernel.org/stable/c/18c4ef4e765a798b47980555ed665d78b71aeadf
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PatchKernel patch commithttps://git.kernel.org/stable/c/901f44227072be60812fe8083e83e1533c04eed1
Frequently asked questions
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What is CVE-2025-40322?
CVE-2025-40322 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 2.6.12 onward and has been patched in 5.4.302, 5.10.247, 5.15.197 and others. CVE-2025-40322 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40322?
Yes — CVE-2025-40322 has been patched. Fixed versions include 5.4.302, 5.10.247, 5.15.197 and others. If you are running Linux kernel 2.6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40322 actively exploited?
No — CVE-2025-40322 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.