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.
Metrics
CVSS 3.1 5.5/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < 9027ce4c037b566b658b8939a76326b7125e3627; >= 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < 610f247f2772e4f92b63442125a1b7ade79898d8; >= 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < 2d63433e8eaa3c91b2948190e395bc67009db0d9; >= 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < 54947530663edcbaaee1314c01fdd8c72861b124; >= 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < ab91647acdf43b984824776559a452212eaeb21a; >= 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < b235393b9f43ff86a38ca2bde6372312ea215dc5; >= 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < 53784073cbad18f75583fd3da9ffdfc4d1f05405; >= 96fe6a2109db29cd15b90a093c16e6cb4b19371a, < 3f6dae09fc8c306eb70fdfef70726e1f154e173a |
| Linux | Linux | 2.6.14 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
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
Timeline
- Published
- Jul 10, 2025
- Last modified
- Nov 5, 2026
- NVD status
- Modified