{"id":"CVE-2025-21874","title":"dm-integrity: Avoid divide by zero in table status in Inline mode","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: Avoid divide by zero in table status in Inline mode\n\nIn Inline mode, the journal is unused, and journal_sectors is zero.\n\nCalculating the journal watermar…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= fb0987682c629c1d2c476f35f6fde405a5e304a4 < 22c6f577b3cb184857b440ae5e5916f6c9e7021d","Linux >= fb0987682c629c1d2c476f35f6fde405a5e304a4 < 06d9895f265282e939a8933bb18de82eba2b4dda","Linux >= fb0987682c629c1d2c476f35f6fde405a5e304a4 < 7fb39882b20c98a9a393c244c86b56ef6933cff8","Linux 6.11"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:36:06.022549Z"},"published":"2025-03-27","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:41:46.172Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21874","references":[{"url":"https://git.kernel.org/stable/c/22c6f577b3cb184857b440ae5e5916f6c9e7021d"},{"url":"https://git.kernel.org/stable/c/06d9895f265282e939a8933bb18de82eba2b4dda"},{"url":"https://git.kernel.org/stable/c/7fb39882b20c98a9a393c244c86b56ef6933cff8"}],"tags":["cve.org"],"epss":0.00203,"epssPercentile":0.10347,"ingestedAt":"2026-11-05T22:38:31.852Z","slug":"CVE-2025-21874","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: Avoid divide by zero in table status in Inline mode\n\nIn Inline mode, the journal is unused, and journal_sectors is zero.\n\nCalculating the journal watermark requires dividing by journal_sectors,\nwhich should be done only if the journal is configured.\n\nOtherwise, a simple table query (dmsetup table) can cause OOPS.\n\nThis bug did not show on some systems, perhaps only due to\ncompiler optimization.\n\nOn my 32-bit testing machine, this reliably crashes with the following:\n\n : Oops: divide error: 0000 [#1] PREEMPT SMP\n : CPU: 0 UID: 0 PID: 2450 Comm: dmsetup Not tainted 6.14.0-rc2+ #959\n : EIP: dm_integrity_status+0x2f8/0xab0 [dm_integrity]\n ...\n\n## Affected\n\n- `Linux >= fb0987682c629c1d2c476f35f6fde405a5e304a4 < 22c6f577b3cb184857b440ae5e5916f6c9e7021d`\n- `Linux >= fb0987682c629c1d2c476f35f6fde405a5e304a4 < 06d9895f265282e939a8933bb18de82eba2b4dda`\n- `Linux >= fb0987682c629c1d2c476f35f6fde405a5e304a4 < 7fb39882b20c98a9a393c244c86b56ef6933cff8`\n- `Linux 6.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}