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Integer Overflow or Wraparound The advisory has been revoked - it doesn't affect any version of package kernel-headers  (opens in a new tab)

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0.16% (6th percentile)

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  • Snyk IDSNYK-RHEL10-KERNELHEADERS-13604690
  • published17 Oct 2025
  • disclosed15 Oct 2025
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Introduced: 15 Oct 2025

CVE-2025-39967  (opens in a new tab)
CWE-190  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-headers package and not the kernel-headers package as distributed by RHEL.

In the Linux kernel, the following vulnerability has been resolved:

fbcon: fix integer overflow in fbcon_do_set_font

Fix integer overflow vulnerabilities in fbcon_do_set_font() where font size calculations could overflow when handling user-controlled font parameters.

The vulnerabilities occur when:

  1. CALC_FONTSZ(h, pitch, charcount) performs h * pith * charcount multiplication with user-controlled values that can overflow.
  2. FONT_EXTRA_WORDS * sizeof(int) + size addition can also overflow
  3. This results in smaller allocations than expected, leading to buffer overflows during font data copying.

Add explicit overflow checking using check_mul_overflow() and check_add_overflow() kernel helpers to safety validate all size calculations before allocation.