CVE-2025-21641

MEDIUM EPSS 6.9%
Published Jan 19, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jan 19, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: sysctl: blackhole timeout: avoid using current->nsproxy As mentioned in the previous commit, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'pernet' structure can be obtained from the table->data using container_of().

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
6.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥6.12  –  <6.12.10
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any

References 2

  • git.kernel.org https://git.kernel.org/stable/c/4c74fbdc5ab95b13945be01e6065940b68222db7
    Mailing ListPatch
  • git.kernel.org https://git.kernel.org/stable/c/92cf7a51bdae24a32c592adcdd59a773ae149289
    Mailing ListPatch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/4c74fbdc5ab95b13945be01e6065940b68222db7
    Mailing ListPatch
  • git.kernel.org https://git.kernel.org/stable/c/92cf7a51bdae24a32c592adcdd59a773ae149289
    Mailing ListPatch