CVE-2025-38312
Linux Kernel fbdev Division by Zero Vulnerability
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.
INFO
Published Date :
July 10, 2025, 8:15 a.m.
Last Modified :
July 10, 2025, 1:17 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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CVE-2025-38312.
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The following table lists the changes that have been made to the
CVE-2025-38312 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 10, 2025
Action Type Old Value New Value 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. Added Reference https://git.kernel.org/stable/c/2d63433e8eaa3c91b2948190e395bc67009db0d9 Added Reference https://git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173a Added Reference https://git.kernel.org/stable/c/53784073cbad18f75583fd3da9ffdfc4d1f05405 Added Reference https://git.kernel.org/stable/c/54947530663edcbaaee1314c01fdd8c72861b124 Added Reference https://git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8 Added Reference https://git.kernel.org/stable/c/9027ce4c037b566b658b8939a76326b7125e3627 Added Reference https://git.kernel.org/stable/c/ab91647acdf43b984824776559a452212eaeb21a Added Reference https://git.kernel.org/stable/c/b235393b9f43ff86a38ca2bde6372312ea215dc5
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-38312 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-38312
weaknesses.