fbdev: fb_pm2fb: Avoid potential divide by zero error (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.25 % · percentile 17 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Analyzed
Description
In the Linux kernel, the following vulnerability has been resolved: fbdev: fb_pm2fb: Avoid potential divide by zero error In `do_fb_ioctl()` of fbmem.c, if cmd is FBIOPUT_VSCREENINFO, var will be copied from user, then go through `fb_set_var()` and `info->fbops->fb_check_var()` which could may be `pm2fb_check_var()`. Along the path, `var->pixclock` won't be modified. This function checks whether reciprocal of `var->pixclock` is too high. If `var->pixclock` is zero, there will be a divide by zero error. So, it is necessary to check whether denominator is zero to avoid crash. As this bug is found by Syzkaller, logs are listed below. divide error in pm2fb_check_var Call Trace: <TASK> fb_set_var+0x367/0xeb0 drivers/video/fbdev/core/fbmem.c:1015 do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189
Weaknesses (CWE)
- CWE-369 — Divide By Zero
References
- https://git.kernel.org/stable/c/0f1174f4972ea9fad6becf8881d71adca8e9ca91
- https://git.kernel.org/stable/c/3ec326a6a0d4667585ca595f438c7293e5ced7c4
- https://git.kernel.org/stable/c/7f88cdfea8d7f4dbaf423d808241403b2bb945e4
- https://git.kernel.org/stable/c/7d9591b32a9092fc6391a316b56e8016c6181c3d
- https://git.kernel.org/stable/c/8fc778ee2fb2853f7a3531fa7273349640d8e4e9
- https://git.kernel.org/stable/c/34c3dea1189525cd533071ed5c176fc4ea8d982b
- https://git.kernel.org/stable/c/cb4bb011a683532841344ca7f281b5e04389b4f8
- https://git.kernel.org/stable/c/19f953e7435644b81332dd632ba1b2d80b1e37af
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2022-55258
- GCVE · GCVE-0-2022-49978
CERT-FR advisories
- CERTFR-2026-AVI-0081 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2025-AVI-1009 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0649 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0607 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0587 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*< 4.9.327cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.10 < 4.14.292cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.15 < 4.19.257cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.20 < 5.4.212cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.5 < 5.10.141cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.65cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 5.19.7cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0f1174f4972ea9fad6becf8881d71adca8e9ca91 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3ec326a6a0d4667585ca595f438c7293e5ced7c4 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7f88cdfea8d7f4dbaf423d808241403b2bb945e4 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7d9591b32a9092fc6391a316b56e8016c6181c3d ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8fc778ee2fb2853f7a3531fa7273349640d8e4e9 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 34c3dea1189525cd533071ed5c176fc4ea8d982b |
| Linux · Linux | affected 2.6.12 ; unaffected 0 < 2.6.12 ; unaffected 4.9.327 ≤ 4.9.* ; unaffected 4.14.292 ≤ 4.14.* ; unaffected 4.19.257 ≤ 4.19.* ; unaffected 5.4.212 ≤ 5.4.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |