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

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-03 · updated 2026-10-15
Weakness: CWE-369

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.

Affected products

Debian Linux: 10.0
Linux kernel: before 4.19.308; from 4.20 before 5.4.270; from 5.5 before 5.10.211; from 5.11 before 5.15.150; from 5.16 before 6.1.80; from 6.2 before 6.6.19 — fixed in 4.19.308, 5.10.211, 5.15.150, 5.4.270, 6.1.80, 6.6.19

How to fix

Upgrade to a fixed version: Linux kernel 4.19.308, 5.10.211, 5.15.150, 5.4.270. Check the vendor advisory for mitigations.

References

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