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CVE-2025-38312 – “Linux Kernel fbdev Division by Zero Vulnerability”

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.

  • 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
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