CVE-2025-40304

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Source
https://cve.org/CVERecord?id=CVE-2025-40304
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40304.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-40304
Downstream
Related
Published
2025-12-08T00:46:29.013Z
Modified
2026-03-20T12:43:15.440722Z
Summary
fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds
Details

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, bitputcsaligned and bitputcsunaligned receive mismatched parameters where the buffer is allocated for the clipped width but cnt reflects the original larger count, causing out-of-bounds writes.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40304.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed
996bfaa7372d6718b6d860bdf78f6618e850c702
Fixed
f0982400648a3e00580253e0c48e991f34d2684c
Fixed
1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1
Fixed
ebc0730b490c7f27340b1222e01dd106e820320d
Fixed
86df8ade88d290725554cefd03101ecd0fbd3752
Fixed
15ba9acafb0517f8359ca30002c189a68ddbb939
Fixed
2d1359e11674ed4274934eac8a71877ae5ae7bbb
Fixed
3637d34b35b287ab830e66048841ace404382b67

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40304.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.6.12
Fixed
5.4.302
Type
ECOSYSTEM
Events
Introduced
5.5.0
Fixed
5.10.247
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.197
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.159
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.117
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.58
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.17.8

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40304.json"