dm-verity: disable recursive forward error correction

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Summary

CVECVE-2025-71161
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-23 16:15:53 UTC
Updated2026-06-01 17:16:38 UTC
DescriptionIn 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 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. 2. 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000150000 probability, percentile 0.033390000 (date 2026-06-03)

Problem Types: CWE-193

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a739ff3f543afbb4a041c16cd0182c8e8d366e70 8b821ca892cfeeaf0bedc9fc72717294f67144d5 git Not specified
CNA Linux Linux affected a739ff3f543afbb4a041c16cd0182c8e8d366e70 e227d2b229c7529bd98d348efc55262ccf24ab35 git Not specified
CNA Linux Linux affected a739ff3f543afbb4a041c16cd0182c8e8d366e70 897d9006e75f46f8bd7df78faa424327ae6a4bcf git Not specified
CNA Linux Linux affected a739ff3f543afbb4a041c16cd0182c8e8d366e70 4220cb37406915c926c0e4a3dbab77cd9cceeb1e git Not specified
CNA Linux Linux affected a739ff3f543afbb4a041c16cd0182c8e8d366e70 232948cf600fba69aff36b25d85ef91a73a35756 git Not specified
CNA Linux Linux affected a739ff3f543afbb4a041c16cd0182c8e8d366e70 d9f3e47d3fae0c101d9094bc956ed24e7a0ee801 git Not specified
CNA Linux Linux affected 4.5 Not specified
CNA Linux Linux unaffected 4.5 semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.6 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d9f3e47d3fae0c101d9094bc956ed24e7a0ee801 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/897d9006e75f46f8bd7df78faa424327ae6a4bcf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/232948cf600fba69aff36b25d85ef91a73a35756 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8b821ca892cfeeaf0bedc9fc72717294f67144d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4220cb37406915c926c0e4a3dbab77cd9cceeb1e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e227d2b229c7529bd98d348efc55262ccf24ab35 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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