CVE-2025-38312

fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()

Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod() In fb_find_mode_cvt(), iff mode->refresh somehow happens to be 0x80000000, cvt.f_refresh will become 0 when multiplying it by 2 due to overflow. It's then passed to fb_cvt_hperiod(), where it's used as a divider -- division by 0 will result in kernel oops. Add a sanity check for cvt.f_refresh to avoid such overflow... Found by Linux Verification Center (linuxtesting.org) with the Svace static analysis tool.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/9027ce4c037b566b658b8939a76326b7125e3627
https://git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8
https://git.kernel.org/stable/c/2d63433e8eaa3c91b2948190e395bc67009db0d9
https://git.kernel.org/stable/c/54947530663edcbaaee1314c01fdd8c72861b124
https://git.kernel.org/stable/c/ab91647acdf43b984824776559a452212eaeb21a
https://git.kernel.org/stable/c/b235393b9f43ff86a38ca2bde6372312ea215dc5
https://git.kernel.org/stable/c/53784073cbad18f75583fd3da9ffdfc4d1f05405
https://git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173a

Frequently Asked Questions

What is the severity of CVE-2025-38312?: CVE-2025-38312 has not yet been assigned a CVSS score.
How to fix CVE-2025-38312?: To fix CVE-2025-38312, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-38312 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-38312 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-38312?: CVE-2025-38312 affects Linux Linux, Linux Linux.

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