CVE-2025-38312

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

State: Published
Severity: Not scored
Published: Jul 10, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 9027ce4c037b566b658b8939a76326b7125e3627Affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 610f247f2772e4f92b63442125a1b7ade79898d8Affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 2d63433e8eaa3c91b2948190e395bc67009db0d9Affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 54947530663edcbaaee1314c01fdd8c72861b124Affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a to before ab91647acdf43b984824776559a452212eaeb21aAffected 96fe6a2109db29cd15b90a093c16e6cb4b19371a to before b235393b9f43ff86a38ca2bde6372312ea215dc5Affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 53784073cbad18f75583fd3da9ffdfc4d1f05405Affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 3f6dae09fc8c306eb70fdfef70726e1f154e173aAffected
LinuxLinux	2.6.14Affected before 2.6.14Not affected 5.4.295 through 5.4.Not affected 5.10.239 through 5.10.Not affected 5.15.186 through 5.15.Not affected 6.1.142 through 6.1.Not affected 6.6.94 through 6.6.Not affected 6.12.34 through 6.12.Not affected 6.15.3 through 6.15.*Not affected 6.16 and laterNot affected

Product

Versions

LinuxLinux

96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 9027ce4c037b566b658b8939a76326b7125e3627Affected
96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 610f247f2772e4f92b63442125a1b7ade79898d8Affected
96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 2d63433e8eaa3c91b2948190e395bc67009db0d9Affected
96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 54947530663edcbaaee1314c01fdd8c72861b124Affected
96fe6a2109db29cd15b90a093c16e6cb4b19371a to before ab91647acdf43b984824776559a452212eaeb21aAffected
96fe6a2109db29cd15b90a093c16e6cb4b19371a to before b235393b9f43ff86a38ca2bde6372312ea215dc5Affected
96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 53784073cbad18f75583fd3da9ffdfc4d1f05405Affected
96fe6a2109db29cd15b90a093c16e6cb4b19371a to before 3f6dae09fc8c306eb70fdfef70726e1f154e173aAffected

LinuxLinux

2.6.14Affected
before 2.6.14Not affected
5.4.295 through 5.4.*Not affected
5.10.239 through 5.10.*Not affected
5.15.186 through 5.15.*Not affected
6.1.142 through 6.1.*Not affected
6.6.94 through 6.6.*Not affected
6.12.34 through 6.12.*Not affected
6.15.3 through 6.15.*Not affected
6.16 and laterNot affected

References

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