Answer in brief
CVE-2025-39967 records a High severity (CVSS 7.8) vulnerability in fbcon: fix integer overflow in fbcon_do_set_font. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.9:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.9:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.9:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.9:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.9:rc6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.9:rc7:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.9:rc8:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 5.9 | Not reported |
| Linux/Linuxgeneric | >=96e41fc29e8af5c5085fb8a79cab8d0d00bab86c <994bdc2d23c79087fbf7dcd9544454e8ebcef877 || >=39b3cffb8cf3111738ea993e2757ab382253d86a <9c8ec14075c5317edd6b242f1be8167aa1e4e333 || >=39b3cffb8cf3111738ea993e2757ab382253d86a <b8a6e85328aeb9881531dbe89bcd2637a06c3c95 || >=39b3cffb8cf3111738ea993e2757ab382253d86a <a6eb9f423b3db000aaedf83367b8539f6b72dcfc || >=39b3cffb8cf3111738ea993e2757ab382253d86a <adac90bb1aaf45ca66f9db8ac100be16750ace78 || >=39b3cffb8cf3111738ea993e2757ab382253d86a <4a4bac869560f943edbe3c2b032062f6673b13d3 || >=39b3cffb8cf3111738ea993e2757ab382253d86a <c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7 || >=39b3cffb8cf3111738ea993e2757ab382253d86a <1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe || ae021a904ac82d9fc81c25329d3c465c5a7d5686 || 451bffa366f2cc0e5314807cb847f31c0226efed || 2c455e9c5865861f5ce09c5f596909495ed7657c || 72f099805dbc907fbe8fa19bccdc31d3e2ee6e9e || 34cf1aff169dc6dedad8d79da7bf1b4de2773dbc || >=5.4.62 <5.4.300 || >=4.4.235 <4.5 || >=4.9.235 <4.10 || >=4.14.196 <4.15 || >=4.19.143 <4.20 || >=5.8.6 <5.9 | 994bdc2d23c79087fbf7dcd9544454e8ebcef877, 9c8ec14075c5317edd6b242f1be8167aa1e4e333, b8a6e85328aeb9881531dbe89bcd2637a06c3c95, a6eb9f423b3db000aaedf83367b8539f6b72dcfc, adac90bb1aaf45ca66f9db8ac100be16750ace78, 4a4bac869560f943edbe3c2b032062f6673b13d3, c0c01f9aa08c8e10e10e8c9ebb5be01a4eff6eb7, 1a194e6c8e1ee745e914b0b7f50fa86c89ed13fe, 5.4.300, 4.5, 4.10, 4.15, 4.20, 5.9 |
Published upstream
Oct 15, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: fbcon: fix integer overflow in fbcon_do_set_font Fix integer overflow vulnerabilities in fbcon_do_set_font() where font size calculations could overflow when handling user-controlled font parameters. The vulnerabilities occur when: 1. CALC_FONTSZ(h, pitch, charcount) performs h * pith * charcount multiplication with user-controlled values that can overflow. 2. FONT_EXTRA_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 check_mul_overflow() and check_add_overflow() kernel helpers to safety validate all size calculations before allocation.
Quoted source text, attributed separately from HOL analysis.