CVE-2025-38312
fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a; < 9027ce4c037b566b658b8939a76326b7125e3627 (affected, git) ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a; < 610f247f2772e4f92b63442125a1b7ade79898d8 (affected, git) ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a; < 2d63433e8eaa3c91b2948190e395bc67009db0d9 (affected, git) ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a; < 54947530663edcbaaee1314c01fdd8c72861b124 (affected, git) ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a; < ab91647acdf43b984824776559a452212eaeb21a (affected, git) ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a; < b235393b9f43ff86a38ca2bde6372312ea215dc5 (affected, git) ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a; < 53784073cbad18f75583fd3da9ffdfc4d1f05405 (affected, git) ≥ 96fe6a2109db29cd15b90a093c16e6cb4b19371a; < 3f6dae09fc8c306eb70fdfef70726e1f154e173a (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
2.6.14 (affected) ≥ 0; < 2.6.14 (unaffected, semver) ≥ 5.4.295; ≤ 5.4.* (unaffected, semver) ≥ 5.10.239; ≤ 5.10.* (unaffected, semver) ≥ 5.15.186; ≤ 5.15.* (unaffected, semver) ≥ 6.1.142; ≤ 6.1.* (unaffected, semver) ≥ 6.6.94; ≤ 6.6.* (unaffected, semver) ≥ 6.12.34; ≤ 6.12.* (unaffected, semver) ≥ 6.15.3; ≤ 6.15.* (unaffected, semver) ≥ 6.16; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/9027ce4c037b566b658b8939a76326b7125e3627CNA: Linux
- https://git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8CNA: Linux
- https://git.kernel.org/stable/c/2d63433e8eaa3c91b2948190e395bc67009db0d9CNA: Linux
- https://git.kernel.org/stable/c/54947530663edcbaaee1314c01fdd8c72861b124CNA: Linux
- https://git.kernel.org/stable/c/ab91647acdf43b984824776559a452212eaeb21aCNA: Linux
- https://git.kernel.org/stable/c/b235393b9f43ff86a38ca2bde6372312ea215dc5CNA: Linux
- https://git.kernel.org/stable/c/53784073cbad18f75583fd3da9ffdfc4d1f05405CNA: Linux
- https://git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173aCNA: Linux
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlADP: CVE
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlADP: CVE
- https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlADP: siemens-SADP
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