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Review reviewHigh

CVE-2025-40304

Linux

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_una...

CVSS
7.8
EPSS
0.14%
3.88% percentile
CISA KEV
Not listed
Published
2025.12.08
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

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_una...

Affected product and versions

Product
Linux
Affected versions
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 996bfaa7372d6718b6d860bdf78f6618e850c702, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f0982400648a3e00580253e0c48e991f34d2684c, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ebc0730b490c7f27340b1222e01dd106e820320d, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 86df8ade88d290725554cefd03101ecd0fbd3752, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 15ba9acafb0517f8359ca30002c189a68ddbb939, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2d1359e11674ed4274934eac8a71877ae5ae7bbb, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3637d34b35b287ab830e66048841ace404382b67, >= 2.6.12
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-40304 — Linux | SECUFOCUS NOW