5.5

CVE-2025-39795: block: avoid possible overflow for chunk_sectors check in blk_stack_limits()

Modified
AliasesUBUNTU-CVE-2025-39795DEBIAN-CVE-2025-39795
Published 12-09-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-39795 is a medium (CVSS 5.5) Uncontrolled Recursion vulnerability in debian debian_linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 33 · Related 30
DLA-4327-1DLA-4328-1DSA-6009-1OPENSUSE-SU-2026:20287-1SUSE-SU-2026:20555-1SUSE-SU-2026:20570-1

Timeline

  1. 12-09-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: block: avoid possible overflow for chunk_sectors check in blk_stack_limits() In blk_stack_limits(), we check that the t->chunk_sectors value is a multiple of the t->physical_block_size value. However, by finding the chunk_sectors value in bytes, we may overflow the unsigned int which holds chunk_sectors, so change the check to be based on sectors.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.17% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu149 products
  • linuxAll versions (No fix recorded) | < 5.15.0-163.173 | < 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1097.104 | < 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.153-1 | < 6.12.43-1 | < 6.16.3-1
  • debian_linuxEOL11.0
Linux2 products
  • linux≥ 22ada802ede89829dd010a317d9b812b7df7111a, < 418751910044649baa2b424ea31cce3fc4dcc253 | ≥ 22ada802ede89829dd010a317d9b812b7df7111a, < 8b3ce085b52e674290cbfdd07034e7653ffbe4dc | ≥ 22ada802ede89829dd010a317d9b812b7df7111a, < 31f2f080898e50cbf2bae62d35f9f2a997547b38 | ≥ 22ada802ede89829dd010a317d9b812b7df7111a, < 3b9d69f0e68aa6b0acd9791c45d445154a8c66e9 | ≥ 22ada802ede89829dd010a317d9b812b7df7111a, < 46aa80ef49594ed7de685ecbc673b291e9a2c159 | ≥ 22ada802ede89829dd010a317d9b812b7df7111a, < 5e276e6ff9aacf8901b9c3265c3cdd2568c9fff2 | ≥ 22ada802ede89829dd010a317d9b812b7df7111a, < 14beeef4aafecc8a41de534e31fb5be94739392f | ≥ 22ada802ede89829dd010a317d9b812b7df7111a, < 448dfecc7ff807822ecd47a5c052acedca7d09e8 | 5.10
  • linux_kernel≥ 5.10, < 5.10.241 | ≥ 5.11, < 5.15.190 | ≥ 5.16, < 6.1.149 | ≥ 6.2, < 6.6.103 | ≥ 6.7, < 6.12.43 | ≥ 6.13, < 6.15.11 | ≥ 6.16, < 6.16.2

3 vendors · 153 products

References

44 links
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