{"id":"CVE-2025-38312","state":"PUBLISHED","title":"fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()\n\nIn fb_find_mode_cvt(), iff mode->refresh somehow happens to be 0x80000000,\ncvt.f_refresh will become 0 when multiplying it by 2 due to overflow. It's\nthen passed to fb_cvt_hperiod(), where it's used as a divider -- division\nby 0 will result in kernel oops. Add a sanity check for cvt.f_refresh to\navoid such overflow...\n\nFound by Linux Verification Center (linuxtesting.org) with the Svace static\nanalysis tool.","publishedAt":"2025-07-10T07:42:20.647Z","updatedAt":"2026-10-15T01:07:03.801Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"96fe6a2109db29cd15b90a093c16e6cb4b19371a","status":"affected","lessThan":"9027ce4c037b566b658b8939a76326b7125e3627","versionType":"git"},{"version":"96fe6a2109db29cd15b90a093c16e6cb4b19371a","status":"affected","lessThan":"610f247f2772e4f92b63442125a1b7ade79898d8","versionType":"git"},{"version":"96fe6a2109db29cd15b90a093c16e6cb4b19371a","status":"affected","lessThan":"2d63433e8eaa3c91b2948190e395bc67009db0d9","versionType":"git"},{"version":"96fe6a2109db29cd15b90a093c16e6cb4b19371a","status":"affected","lessThan":"54947530663edcbaaee1314c01fdd8c72861b124","versionType":"git"},{"version":"96fe6a2109db29cd15b90a093c16e6cb4b19371a","status":"affected","lessThan":"ab91647acdf43b984824776559a452212eaeb21a","versionType":"git"},{"version":"96fe6a2109db29cd15b90a093c16e6cb4b19371a","status":"affected","lessThan":"b235393b9f43ff86a38ca2bde6372312ea215dc5","versionType":"git"},{"version":"96fe6a2109db29cd15b90a093c16e6cb4b19371a","status":"affected","lessThan":"53784073cbad18f75583fd3da9ffdfc4d1f05405","versionType":"git"},{"version":"96fe6a2109db29cd15b90a093c16e6cb4b19371a","status":"affected","lessThan":"3f6dae09fc8c306eb70fdfef70726e1f154e173a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/core/fbcvt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.14","versionType":"semver"},{"version":"5.4.295","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.239","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.186","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.142","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.94","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.34","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.15.3","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/core/fbcvt.c"]}],"references":["https://git.kernel.org/stable/c/9027ce4c037b566b658b8939a76326b7125e3627","https://git.kernel.org/stable/c/610f247f2772e4f92b63442125a1b7ade79898d8","https://git.kernel.org/stable/c/2d63433e8eaa3c91b2948190e395bc67009db0d9","https://git.kernel.org/stable/c/54947530663edcbaaee1314c01fdd8c72861b124","https://git.kernel.org/stable/c/ab91647acdf43b984824776559a452212eaeb21a","https://git.kernel.org/stable/c/b235393b9f43ff86a38ca2bde6372312ea215dc5","https://git.kernel.org/stable/c/53784073cbad18f75583fd3da9ffdfc4d1f05405","https://git.kernel.org/stable/c/3f6dae09fc8c306eb70fdfef70726e1f154e173a","https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html","https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html","https://cert-portal.siemens.com/productcert/html/ssa-082556.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/38xxx/CVE-2025-38312.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38312","state":"PUBLISHED","datePublished":"2025-07-10T07:42:20.647Z","dateUpdated":"2026-10-15T01:07:03.801Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T04:51:24.003Z"},"containers":{"cna":{"title":"fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod()\n\nIn fb_find_mode_cvt(), iff mode->refresh somehow happens to be 0x80000000,\ncvt.f_refresh will become 0 when multiplying it by 2 due to overflow. It's\nthen passed to fb_cvt_hperiod(), where it's used as a divider -- division\nby 0 will result in kernel oops. Add a sanity check for cvt.f_refresh to\navoid such overflow...\n\nFound by Linux Verification Center (linuxtesting.org) with the Svace static\nanalysis 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