🛡️ AZL-57225 — kernel

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2025-21639 affecting package kernel for versions less than 5.15.179.1-1

In the Linux kernel, the following vulnerability has been resolved:

sctp: sysctl: rto_min/max: avoid using current->nsproxy

As mentioned in a previous commit of this series, 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 'net' structure can be obtained from the table->data using

container_of().

Note that table->data could also be used directly, as this is the only

member needed from the 'net' structure, but that would increase the size

of this fix, to use '*data' everywhere 'net->sctp.rto_min/max' is used.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

AZL-57225 is recorded against 1 package.

  • kernel (fixed in 5.15.179.1-1)

Timeline and source

Published on 19 January 2025 and last revised on 21 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-01-19
Updated 2026-08-12
Modified 2026-04-21
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel — 5.15.179.1-1

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