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Out-of-bounds Write The advisory has been revoked - it doesn't affect any version of package kernel-modules-extra-matched  (opens in a new tab)

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EPSS
0.07% (22nd percentile)

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  • Snyk IDSNYK-RHEL10-KERNELMODULESEXTRAMATCHED-14226563
  • published9 Dec 2025
  • disclosed8 Dec 2025
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Introduced: 8 Dec 2025

CVE-2025-40304  (opens in a new tab)
CWE-787  (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-modules-extra-matched package and not the kernel-modules-extra-matched package as distributed by RHEL.

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

fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds

Add bounds checking to prevent writes past framebuffer boundaries when rendering text near screen edges. Return early if the Y position is off-screen and clip image height to screen boundary. Break from the rendering loop if the X position is off-screen. When clipping image width to fit the screen, update the character count to match the clipped width to prevent buffer size mismatches.

Without the character count update, bit_putcs_aligned and bit_putcs_unaligned receive mismatched parameters where the buffer is allocated for the clipped width but cnt reflects the original larger count, causing out-of-bounds writes.