fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()

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Summary

CVECVE-2025-38312
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-07-10 08:15:30 UTC
Updated2026-05-12 13:16:47 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-369

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a 9027ce4c037b566b658b8939a76326b7125e3627 git Not specified
CNA Linux Linux affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a 610f247f2772e4f92b63442125a1b7ade79898d8 git Not specified
CNA Linux Linux affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a 2d63433e8eaa3c91b2948190e395bc67009db0d9 git Not specified
CNA Linux Linux affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a 54947530663edcbaaee1314c01fdd8c72861b124 git Not specified
CNA Linux Linux affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a ab91647acdf43b984824776559a452212eaeb21a git Not specified
CNA Linux Linux affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a b235393b9f43ff86a38ca2bde6372312ea215dc5 git Not specified
CNA Linux Linux affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a 53784073cbad18f75583fd3da9ffdfc4d1f05405 git Not specified
CNA Linux Linux affected 96fe6a2109db29cd15b90a093c16e6cb4b19371a 3f6dae09fc8c306eb70fdfef70726e1f154e173a git Not specified
CNA Linux Linux affected 2.6.14 Not specified
CNA Linux Linux unaffected 2.6.14 semver Not specified
CNA Linux Linux unaffected 5.4.295 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.239 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.186 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.142 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.94 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.34 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.3 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2d63433e8eaa3c91b2948190e395bc67009db0d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-082556.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/53784073cbad18f75583fd3da9ffdfc4d1f05405 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b235393b9f43ff86a38ca2bde6372312ea215dc5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ab91647acdf43b984824776559a452212eaeb21a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9027ce4c037b566b658b8939a76326b7125e3627 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/54947530663edcbaaee1314c01fdd8c72861b124 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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