CVE-2025-38579

HIGH EPSS 4.9%
Published Aug 19, 202510mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Aug 19, 2025 10mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
4.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-908

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥5.15  –  <5.15.190
linuxlinux_kernel*≥5.16  –  <6.1.148
linuxlinux_kernel*≥6.2  –  <6.6.102
linuxlinux_kernel*≥6.7  –  <6.12.42
linuxlinux_kernel*≥6.13  –  <6.15.10
linuxlinux_kernel*≥6.16  –  <6.16.1
debiandebian_linux11.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Mailing ListThird Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/01b6f5955e0008af6bc3a181310d2744bb349800
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/08e8ab00a6d20d5544c932ee85a297d833895141
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/154467f4ad033473e5c903a03e7b9bca7df9a0fa
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/44a79437309e0ee2276ac17aaedc71253af253a8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cc1615d5aba4f396cf412579928539a2b124c8a0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dabfa3952c8e6bfe6414dbf32e8b6c5f349dc898
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e68b751ec2b15d866967812c57cfdfc1eba6a269
    Patch