CVE-2025-38312
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…
Does this matter?
Lower severity and a low EPSS score (0.16%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.16% probability · 5th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-369
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2d63433e8eaa3c91b2948190e395bc67009db0d9Patch
- https://git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173aPatch
- https://git.kernel.org/stable/c/53784073cbad18f75583fd3da9ffdfc4d1f05405Patch
- https://git.kernel.org/stable/c/54947530663edcbaaee1314c01fdd8c72861b124Patch
- https://git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8Patch
- https://git.kernel.org/stable/c/9027ce4c037b566b658b8939a76326b7125e3627Patch
- https://git.kernel.org/stable/c/ab91647acdf43b984824776559a452212eaeb21aPatch
- https://git.kernel.org/stable/c/b235393b9f43ff86a38ca2bde6372312ea215dc5Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.