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NVD / CVE Program· CNA Linux

CVE-2026-72105: dm-log: fix a bitset_size overflow on 32bit machines

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1c3412b584e1fb6c665ff33ba7259253bc0082cb, 4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723, 5.10.261.

Low priority for now. Upgrade to Linux Linux 1c3412b584e1fb6c665ff33ba7259253bc0082cb, 4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723, 5.10.261 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In 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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 6th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4ec8323b9f0764a14d532b1ae9b87f8a9fecb867, 7.1affected
    • 44ab8875ae4a2842bde2d756bed195d375e0debb and later · before cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5affected · git
    • defe483e47173768c227532694dc78cb65db5f09 and later · before 4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723affected · git
    • 3ec74da927b4e171a6fc0e77b1188ba4d019af51 and later · before 567602fa72d57169365cbc589e0b8c3be900636daffected · git
    • d4ac87567f86a55c3c92e9a5144dcd943a9772a1 and later · before d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7aaffected · git
    • 12bd5b88e91a02785244ff1d20fb157e96e9cdc8 and later · before 1c3412b584e1fb6c665ff33ba7259253bc0082cbaffected · git
    • b455903eed4558982be0811f5b7f44f6bbc4ff57 and later · before e0b0163a65758ec3a2361ae1cea407898c27f21eaffected · git
    • c20e36b7631d83e7535877f08af8b0af72c44b1a and later · before 79feb87ab2396d49b9b65e4bb815d33cc71cba47affected · git
    • c20e36b7631d83e7535877f08af8b0af72c44b1a and later · before 9743132a41f4d9d0e54c5f2adcb821b04796bab1affected · git
    • 5.10.258 and later · before 5.10.261affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-72102Aug 15, 2026 · dm_early_create: fix freeing used table on dm_resume failure
    31Monitor
  • ← EarlierCVE-2026-72103Aug 15, 2026 · dm: avoid leaking the caller's thread keyring via the table device file
    29Monitor
  • Later →CVE-2026-72106Aug 15, 2026 · dm-ioctl: fix a possible overflow in list_version_get_info
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1c3412b584e1fb6c665ff33ba7259253bc0082cbVendor (CNA)
Linux Linux4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723Vendor (CNA)
Linux Linux5.10.261Vendor (CNA)
Linux Linux5.15.212Vendor (CNA)
Linux Linux567602fa72d57169365cbc589e0b8c3be900636dVendor (CNA)
Linux Linux6.1.178Vendor (CNA)
Linux Linux6.12.97Vendor (CNA)
Linux Linux6.18.40Vendor (CNA)
Linux Linux6.6.145Vendor (CNA)
Linux Linux7.1Vendor (CNA)
Linux Linux79feb87ab2396d49b9b65e4bb815d33cc71cba47Vendor (CNA)
Linux Linux9743132a41f4d9d0e54c5f2adcb821b04796bab1Vendor (CNA)
Linux Linuxcdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5Vendor (CNA)
Linux Linuxd05e0edfecf5260e6dddd28b2f0cce02bfc6ed7aVendor (CNA)
Linux Linuxe0b0163a65758ec3a2361ae1cea407898c27f21eVendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-720140 days apartdrbd: reject data replies with an out-of-range payload size
    39Monitor
  • CVE-2026-681585 days apartlibceph: Fix multiplication overflow in decode_new_up_state_weight()
    39Monitor
  • CVE-2026-6398427 days apartipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
    39Monitor
  • CVE-2025-68794214 days apartiomap: adjust read range correctly for non-block-aligned positions
    39Monitor
  • CVE-2026-681085 days apartdrm/amdgpu/vce: fix integer overflow in image size
    35Monitor
  • CVE-2026-681255 days apartmac802154: llsec: reject frames shorter than the authentication tag
    35Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records