VulnerabilityPublished 10 Jul 2025Updated 5 Nov 2026

CVE-2025-38312: Linux kernel · fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in b235393b9f43ff86a38ca2bde6372312ea215dc5 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:19 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in b235393b9f43ff86a38ca2bde6372312ea215dc5, ab91647acdf43b984824776559a452212eaeb21a, 54947530663edcbaaee1314c01fdd8c72861b124 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < b235393b9f43ff86a38ca2bde6372312ea215dc5	Fixed in b235393b9f43ff86a38ca2bde6372312ea215dc5
LinuxLinux	Affected ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < ab91647acdf43b984824776559a452212eaeb21a	Fixed in ab91647acdf43b984824776559a452212eaeb21a
LinuxLinux	Affected ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < 54947530663edcbaaee1314c01fdd8c72861b124	Fixed in 54947530663edcbaaee1314c01fdd8c72861b124
LinuxLinux	Affected ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < 53784073cbad18f75583fd3da9ffdfc4d1f05405	Fixed in 53784073cbad18f75583fd3da9ffdfc4d1f05405
LinuxLinux	Affected ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < 9027ce4c037b566b658b8939a76326b7125e3627	Fixed in 9027ce4c037b566b658b8939a76326b7125e3627
LinuxLinux	Affected ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < 610f247f2772e4f92b63442125a1b7ade79898d8	Fixed in 610f247f2772e4f92b63442125a1b7ade79898d8

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.

References

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