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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.

PUBLISHED Reserved 2025-04-16 | Published 2025-07-10 | Updated 2026-05-12 | Assigner Linux

Product status

Default status
unaffected

96fe6a2109db29cd15b90a093c16e6cb4b19371a (git) before 9027ce4c037b566b658b8939a76326b7125e3627
affected

96fe6a2109db29cd15b90a093c16e6cb4b19371a (git) before 610f247f2772e4f92b63442125a1b7ade79898d8
affected

96fe6a2109db29cd15b90a093c16e6cb4b19371a (git) before 2d63433e8eaa3c91b2948190e395bc67009db0d9
affected

96fe6a2109db29cd15b90a093c16e6cb4b19371a (git) before 54947530663edcbaaee1314c01fdd8c72861b124
affected

96fe6a2109db29cd15b90a093c16e6cb4b19371a (git) before ab91647acdf43b984824776559a452212eaeb21a
affected

96fe6a2109db29cd15b90a093c16e6cb4b19371a (git) before b235393b9f43ff86a38ca2bde6372312ea215dc5
affected

96fe6a2109db29cd15b90a093c16e6cb4b19371a (git) before 53784073cbad18f75583fd3da9ffdfc4d1f05405
affected

96fe6a2109db29cd15b90a093c16e6cb4b19371a (git) before 3f6dae09fc8c306eb70fdfef70726e1f154e173a
affected

Default status
affected

2.6.14
affected

Any version before 2.6.14
unaffected

5.4.295 (semver)
unaffected

5.10.239 (semver)
unaffected

5.15.186 (semver)
unaffected

6.1.142 (semver)
unaffected

6.6.94 (semver)
unaffected

6.12.34 (semver)
unaffected

6.15.3 (semver)
unaffected

6.16 (original_commit_for_fix)
unaffected

References

lists.debian.org/debian-lts-announce/2025/10/msg00008.html

lists.debian.org/debian-lts-announce/2025/10/msg00007.html

cert-portal.siemens.com/productcert/html/ssa-082556.html

git.kernel.org/...c/9027ce4c037b566b658b8939a76326b7125e3627

git.kernel.org/...c/610f247f2772e4f92b63442125a1b7ade79898d8

git.kernel.org/...c/2d63433e8eaa3c91b2948190e395bc67009db0d9

git.kernel.org/...c/54947530663edcbaaee1314c01fdd8c72861b124

git.kernel.org/...c/ab91647acdf43b984824776559a452212eaeb21a

git.kernel.org/...c/b235393b9f43ff86a38ca2bde6372312ea215dc5

git.kernel.org/...c/53784073cbad18f75583fd3da9ffdfc4d1f05405

git.kernel.org/...c/3f6dae09fc8c306eb70fdfef70726e1f154e173a

cve.org (CVE-2025-38312)

nvd.nist.gov (CVE-2025-38312)

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