{"id":"CVE-2026-80580","title":"fbdev: bound mode sysfs output to the sysfs buffer","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: bound mode sysfs output to the sysfs buffer\n\nmode_string() uses snprintf() which can return a value larger than the\nremaining buffer space. show_modes() accumula…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 873a1aa15c313263f2e18b38cf525623cc4fabf6","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d15d51fb26e830af58f3f21964f1c09c239077ea","Linux 2.6.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T19:17:49.806822Z"},"published":"2026-08-26","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:26:28.187Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80580","references":[{"url":"https://git.kernel.org/stable/c/873a1aa15c313263f2e18b38cf525623cc4fabf6"},{"url":"https://git.kernel.org/stable/c/d15d51fb26e830af58f3f21964f1c09c239077ea"}],"tags":["cve.org"],"epss":0.00112,"epssPercentile":0.01298,"ingestedAt":"2026-10-16T19:46:24.315Z","slug":"CVE-2026-80580","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: bound mode sysfs output to the sysfs buffer\n\nmode_string() uses snprintf() which can return a value larger than the\nremaining buffer space. show_modes() accumulates the return value into i\nwithout checking whether i has reached PAGE_SIZE, causing the offset to\nadvance past the sysfs buffer if the modelist is long enough.\n\nAdd a size parameter to mode_string() and use scnprintf() to return\nonly the bytes actually written. Add an early return when offset\nalready exceeds the buffer. In show_modes(), stop accumulating once\nthe buffer is full.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 873a1aa15c313263f2e18b38cf525623cc4fabf6`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d15d51fb26e830af58f3f21964f1c09c239077ea`\n- `Linux 2.6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}