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CVE-2025-40304

HIGHCVSS 7.8/10EPSS 0.18%

Last modified

CVE-2025-40304 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.18%

7.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 996bfaa7372d6718b6d860bdf78f6618e850c702; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f0982400648a3e00580253e0c48e991f34d2684c; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ebc0730b490c7f27340b1222e01dd106e820320d; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 86df8ade88d290725554cefd03101ecd0fbd3752; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 15ba9acafb0517f8359ca30002c189a68ddbb939; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2d1359e11674ed4274934eac8a71877ae5ae7bbb; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3637d34b35b287ab830e66048841ace404382b67
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is CVE-2025-40304?
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.
How severe is CVE-2025-40304?
CVE-2025-40304 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2025-40304?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST