{"id":"CVE-2025-71161","title":"dm-verity: disable recursive forward error correction","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity: disable recursive forward error correction\n\nThere are two problems with the recursive correction:\n\n1. It may cause denial-of-service. In fec_read_bufs, there…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 8b821ca892cfeeaf0bedc9fc72717294f67144d5","Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < e227d2b229c7529bd98d348efc55262ccf24ab35","Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 897d9006e75f46f8bd7df78faa424327ae6a4bcf","Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 4220cb37406915c926c0e4a3dbab77cd9cceeb1e","Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 232948cf600fba69aff36b25d85ef91a73a35756","Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < d9f3e47d3fae0c101d9094bc956ed24e7a0ee801","Linux 4.5"],"published":"2026-01-23","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:44:03.288Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-71161","references":[{"url":"https://git.kernel.org/stable/c/8b821ca892cfeeaf0bedc9fc72717294f67144d5"},{"url":"https://git.kernel.org/stable/c/e227d2b229c7529bd98d348efc55262ccf24ab35"},{"url":"https://git.kernel.org/stable/c/897d9006e75f46f8bd7df78faa424327ae6a4bcf"},{"url":"https://git.kernel.org/stable/c/4220cb37406915c926c0e4a3dbab77cd9cceeb1e"},{"url":"https://git.kernel.org/stable/c/232948cf600fba69aff36b25d85ef91a73a35756"},{"url":"https://git.kernel.org/stable/c/d9f3e47d3fae0c101d9094bc956ed24e7a0ee801"}],"tags":["cve.org"],"epss":0.00379,"epssPercentile":0.29057,"ingestedAt":"2026-09-08T15:33:26.994Z","slug":"CVE-2025-71161","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity: disable recursive forward error correction\n\nThere are two problems with the recursive correction:\n\n1. It may cause denial-of-service. In fec_read_bufs, there is a loop that\nhas 253 iterations. For each iteration, we may call verity_hash_for_block\nrecursively. There is a limit of 4 nested recursions - that means that\nthere may be at most 253^4 (4 billion) iterations. Red Hat QE team\nactually created an image that pushes dm-verity to this limit - and this\nimage just makes the udev-worker process get stuck in the 'D' state.\n\n2. It doesn't work. In fec_read_bufs we store data into the variable\n\"fio->bufs\", but fio bufs is shared between recursive invocations, if\n\"verity_hash_for_block\" invoked correction recursively, it would\noverwrite partially filled fio->bufs.\n\n## Affected\n\n- `Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 8b821ca892cfeeaf0bedc9fc72717294f67144d5`\n- `Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < e227d2b229c7529bd98d348efc55262ccf24ab35`\n- `Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 897d9006e75f46f8bd7df78faa424327ae6a4bcf`\n- `Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 4220cb37406915c926c0e4a3dbab77cd9cceeb1e`\n- `Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 232948cf600fba69aff36b25d85ef91a73a35756`\n- `Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < d9f3e47d3fae0c101d9094bc956ed24e7a0ee801`\n- `Linux 4.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}