{"id":"CVE-2023-54285","title":"iomap: Fix possible overflow condition in iomap_write_delalloc_scan","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\niomap: Fix possible overflow condition in iomap_write_delalloc_scan\n\nfolio_next_index() returns an unsigned long value which left shifted\nby PAGE_SHIFT could possibly c…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 38be53c3fd7f4f4bd5de319a323d72f9f6beb16d < 0c6cf409093f307ee05114f834516730c0da5b21","Linux >= f43dc4dc3eff028b5ddddd99f3a66c5a6bdd4e78 < 5c281b0c5d18c8eeb1cfd5023f4adb153e6d1240","Linux >= f43dc4dc3eff028b5ddddd99f3a66c5a6bdd4e78 < eee2d2e6ea5550118170dbd5bb1316ceb38455fb","Linux >= 6.1.92 < 6.1.162","Linux 6.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T21:40:04.519325Z"},"published":"2025-12-30","updated":"2026-10-15","sourceUpdated":"2026-10-15T21:41:44.022Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-54285","references":[{"url":"https://git.kernel.org/stable/c/0c6cf409093f307ee05114f834516730c0da5b21"},{"url":"https://git.kernel.org/stable/c/5c281b0c5d18c8eeb1cfd5023f4adb153e6d1240"},{"url":"https://git.kernel.org/stable/c/eee2d2e6ea5550118170dbd5bb1316ceb38455fb"}],"tags":["cve.org"],"epss":0.00179,"epssPercentile":0.06987,"ingestedAt":"2026-10-15T22:48:25.437Z","slug":"CVE-2023-54285","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\niomap: Fix possible overflow condition in iomap_write_delalloc_scan\n\nfolio_next_index() returns an unsigned long value which left shifted\nby PAGE_SHIFT could possibly cause an overflow on 32-bit system. Instead\nuse folio_pos(folio) + folio_size(folio), which does this correctly.\n\n## Affected\n\n- `Linux >= 38be53c3fd7f4f4bd5de319a323d72f9f6beb16d < 0c6cf409093f307ee05114f834516730c0da5b21`\n- `Linux >= f43dc4dc3eff028b5ddddd99f3a66c5a6bdd4e78 < 5c281b0c5d18c8eeb1cfd5023f4adb153e6d1240`\n- `Linux >= f43dc4dc3eff028b5ddddd99f3a66c5a6bdd4e78 < eee2d2e6ea5550118170dbd5bb1316ceb38455fb`\n- `Linux >= 6.1.92 < 6.1.162`\n- `Linux 6.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}