CVE-2025-39967

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Source
https://cve.org/CVERecord?id=CVE-2025-39967
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39967.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-39967
Downstream
Related
Published
2025-10-15T07:55:51.554Z
Modified
2026-03-11T07:53:49.486955467Z
Summary
fbcon: fix integer overflow in fbcon_do_set_font
Details

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

fbcon: fix integer overflow in fbcondoset_font

Fix integer overflow vulnerabilities in fbcondoset_font() where font size calculations could overflow when handling user-controlled font parameters.

The vulnerabilities occur when: 1. CALCFONTSZ(h, pitch, charcount) performs h * pith * charcount multiplication with user-controlled values that can overflow. 2. FONTEXTRA_WORDS * sizeof(int) + size addition can also overflow 3. This results in smaller allocations than expected, leading to buffer overflows during font data copying.

Add explicit overflow checking using checkmuloverflow() and checkaddoverflow() kernel helpers to safety validate all size calculations before allocation.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39967.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
96e41fc29e8af5c5085fb8a79cab8d0d00bab86c
Fixed
994bdc2d23c79087fbf7dcd9544454e8ebcef877
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
39b3cffb8cf3111738ea993e2757ab382253d86a
Fixed
9c8ec14075c5317edd6b242f1be8167aa1e4e333
Fixed
b8a6e85328aeb9881531dbe89bcd2637a06c3c95
Fixed
a6eb9f423b3db000aaedf83367b8539f6b72dcfc
Fixed
adac90bb1aaf45ca66f9db8ac100be16750ace78
Fixed
4a4bac869560f943edbe3c2b032062f6673b13d3
Fixed
c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7
Fixed
1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
ae021a904ac82d9fc81c25329d3c465c5a7d5686
Last affected
451bffa366f2cc0e5314807cb847f31c0226efed
Last affected
2c455e9c5865861f5ce09c5f596909495ed7657c
Last affected
72f099805dbc907fbe8fa19bccdc31d3e2ee6e9e
Last affected
34cf1aff169dc6dedad8d79da7bf1b4de2773dbc

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39967.json"