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

CVE-2025-40304
HIGH 7.8

At a glance

Source
NVD
EPSS
EPSS 0.14 % · percentile 4 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Deferred

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.

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

European references

CERT-FR advisories

Affected products

ProductVersions
Linux · Linuxaffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 996bfaa7372d6718b6d860bdf78f6618e850c702 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f0982400648a3e00580253e0c48e991f34d2684c ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ebc0730b490c7f27340b1222e01dd106e820320d ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 86df8ade88d290725554cefd03101ecd0fbd3752 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 15ba9acafb0517f8359ca30002c189a68ddbb939
Linux · Linuxaffected 2.6.12 ; unaffected 0 < 2.6.12 ; unaffected 5.4.302 ≤ 5.4.* ; unaffected 5.10.247 ≤ 5.10.* ; unaffected 5.15.197 ≤ 5.15.* ; unaffected 6.1.159 ≤ 6.1.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD