dm-log: fix a bitset_size overflow on 32bit machines

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72105
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:24 UTC
Updated2026-10-19 22:17:27 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm-log: fix a bitset_size overflow on 32bit machines Commit c20e36b7631d ("dm log: fix out-of-bounds write due to region_count overflow") made sure that region_count could fit in an unsigned int. But the bitmap memory isn't allocated based on region_count. It uses bitset_size (a size_t variable). The first step of calculating bitset_size is to set it to region_count, rounded up to a multiple of BITS_PER_LONG. If region_size is less than BITS_PER_LONG smaller than UINT_MAX, it will get rounded up to 2^32. On a 32bit architecture, this will make bitset_size wrap around to 0 and fail, despite region_count being valid. Since bitset_size gets divided by 8, it can hold any valid region_count. It just needs a special case to handle the rollover. If it is 0, the value rolled over, and bitset size should be set to the number of bytes needed to hold 2^32 bits.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001690000 probability, percentile 0.058380000 (date 2026-10-19)

Problem Types: CWE-190 | CWE-190 CWE-190 Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 44ab8875ae4a2842bde2d756bed195d375e0debb cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5 git Not specified
CNA Linux Linux affected defe483e47173768c227532694dc78cb65db5f09 4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723 git Not specified
CNA Linux Linux affected 3ec74da927b4e171a6fc0e77b1188ba4d019af51 567602fa72d57169365cbc589e0b8c3be900636d git Not specified
CNA Linux Linux affected d4ac87567f86a55c3c92e9a5144dcd943a9772a1 d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a git Not specified
CNA Linux Linux affected 12bd5b88e91a02785244ff1d20fb157e96e9cdc8 1c3412b584e1fb6c665ff33ba7259253bc0082cb git Not specified
CNA Linux Linux affected b455903eed4558982be0811f5b7f44f6bbc4ff57 e0b0163a65758ec3a2361ae1cea407898c27f21e git Not specified
CNA Linux Linux affected c20e36b7631d83e7535877f08af8b0af72c44b1a 79feb87ab2396d49b9b65e4bb815d33cc71cba47 git Not specified
CNA Linux Linux affected c20e36b7631d83e7535877f08af8b0af72c44b1a 9743132a41f4d9d0e54c5f2adcb821b04796bab1 git Not specified
CNA Linux Linux affected 4ec8323b9f0764a14d532b1ae9b87f8a9fecb867 git Not specified
CNA Linux Linux affected 5.10.258 5.10.261 semver Not specified
CNA Linux Linux affected 5.15.209 5.15.212 semver Not specified
CNA Linux Linux affected 6.1.175 6.1.178 semver Not specified
CNA Linux Linux affected 6.6.141 6.6.145 semver Not specified
CNA Linux Linux affected 6.12.91 6.12.97 semver Not specified
CNA Linux Linux affected 6.18.33 6.18.40 semver Not specified
CNA Linux Linux affected 7.0.10 7.1 semver Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1c3412b584e1fb6c665ff33ba7259253bc0082cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9743132a41f4d9d0e54c5f2adcb821b04796bab1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/79feb87ab2396d49b9b65e4bb815d33cc71cba47 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e0b0163a65758ec3a2361ae1cea407898c27f21e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/567602fa72d57169365cbc589e0b8c3be900636d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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