CVE-2025-71161High· 7.5▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: dm-verity: disable recursive forward error correction There are two problems with the recursive correction: 1. It may cause denial-of-service. In fec_read_bufs, there…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
0.3% → 0.4%
In the Linux kernel, the following vulnerability has been resolved:
dm-verity: disable recursive forward error correction
There are two problems with the recursive correction:
It may cause denial-of-service. In fec_read_bufs, there is a loop that has 253 iterations. For each iteration, we may call verity_hash_for_block recursively. There is a limit of 4 nested recursions - that means that there may be at most 253^4 (4 billion) iterations. Red Hat QE team actually created an image that pushes dm-verity to this limit - and this image just makes the udev-worker process get stuck in the 'D' state.
It doesn't work. In fec_read_bufs we store data into the variable "fio->bufs", but fio bufs is shared between recursive invocations, if "verity_hash_for_block" invoked correction recursively, it would overwrite partially filled fio->bufs.
Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 8b821ca892cfeeaf0bedc9fc72717294f67144d5Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < e227d2b229c7529bd98d348efc55262ccf24ab35Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 897d9006e75f46f8bd7df78faa424327ae6a4bcfLinux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 4220cb37406915c926c0e4a3dbab77cd9cceeb1eLinux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < 232948cf600fba69aff36b25d85ef91a73a35756Linux >= a739ff3f543afbb4a041c16cd0182c8e8d366e70 < d9f3e47d3fae0c101d9094bc956ed24e7a0ee801Linux 4.5Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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