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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/2d63433e8eaa3c91b2948190e395bc67009db0d9 cve-icon cve-icon
https://git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173a cve-icon cve-icon
https://git.kernel.org/stable/c/53784073cbad18f75583fd3da9ffdfc4d1f05405 cve-icon cve-icon
https://git.kernel.org/stable/c/54947530663edcbaaee1314c01fdd8c72861b124 cve-icon cve-icon
https://git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8 cve-icon cve-icon
https://git.kernel.org/stable/c/9027ce4c037b566b658b8939a76326b7125e3627 cve-icon cve-icon
https://git.kernel.org/stable/c/ab91647acdf43b984824776559a452212eaeb21a cve-icon cve-icon
https://git.kernel.org/stable/c/b235393b9f43ff86a38ca2bde6372312ea215dc5 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025071015-CVE-2025-38312-8693@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-38312 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-38312 cve-icon
History

Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00024}

 epss

{'score': 0.00032}

Sat, 12 Jul 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Moderate

Thu, 10 Jul 2025 08:00:00 +0000

Type Values Removed Values Added
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.
Title fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-07-10T07:42:20.647Z

Updated: 2025-07-28T04:18:17.112Z

Reserved: 2025-04-16T04:51:24.003Z

Link: CVE-2025-38312

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-07-10T08:15:30.120

Modified: 2025-07-10T13:17:30.017

Link: CVE-2025-38312

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-07-10T00:00:00Z

Links: CVE-2025-38312 - Bugzilla