7.8

CVE-2025-38579: debian debian_linux Use of Uninitialized Resource

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2025-38579DEBIAN-CVE-2025-38579
Published 19-08-2025Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2025-38579 is a high (CVSS 7.8) Use of Uninitialized Resource vulnerability in debian debian_linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.7% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 34 · Related 31
DLA-4328-1MGASA-2025-0234MGASA-2025-0235USN-7879-1USN-7879-2USN-7879-3

Timeline

  1. 19-08-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix KMSAN uninit-value in extent_info usage KMSAN reported a use of uninitialized value in `__is_extent_mergeable()` and `__is_back_mergeable()` via the read extent tree path. The root cause is that `get_read_extent_info()` only initializes three fields (`fofs`, `blk`, `len`) of `struct extent_info`, leaving the remaining fields uninitialized. This leads to undefined behavior when those fields are accessed later, especially during extent merging. Fix it by zero-initializing the `extent_info` struct before population.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

+0.01 pp

From 0.17% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu135 products
  • linux< 5.15.0-163.173 | < 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 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< 6.1.148-1 | < 6.12.43-1 | < 6.16.3-1
  • debian_linuxEOL11.0
Linux2 products
  • linux≥ 94afd6d6e5253179c9b891d02081cc8355a11768, < 08e8ab00a6d20d5544c932ee85a297d833895141 | ≥ 94afd6d6e5253179c9b891d02081cc8355a11768, < e68b751ec2b15d866967812c57cfdfc1eba6a269 | ≥ 94afd6d6e5253179c9b891d02081cc8355a11768, < dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898 | ≥ 94afd6d6e5253179c9b891d02081cc8355a11768, < 44a79437309e0ee2276ac17aaedc71253af253a8 | ≥ 94afd6d6e5253179c9b891d02081cc8355a11768, < cc1615d5aba4f396cf412579928539a2b124c8a0 | ≥ 94afd6d6e5253179c9b891d02081cc8355a11768, < 01b6f5955e0008af6bc3a181310d2744bb349800 | ≥ 94afd6d6e5253179c9b891d02081cc8355a11768, < 154467f4ad033473e5c903a03e7b9bca7df9a0fa | 5.15
  • linux_kernel≥ 5.15, < 5.15.190 | ≥ 5.16, < 6.1.148 | ≥ 6.2, < 6.6.102 | ≥ 6.7, < 6.12.42 | ≥ 6.13, < 6.15.10 | ≥ 6.16, < 6.16.1

3 vendors · 139 products

References

43 links
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