CVE-2025-21636

MEDIUM EPSS 10.8%
Published Jan 19, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jan 19, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: plpmtud_probe_interval: 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.probe_interval' is used.

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
10.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 10

VendorProductVersionRange
linuxlinux_kernel*≥5.14  –  <5.15.177
linuxlinux_kernel*≥5.16  –  <6.1.125
linuxlinux_kernel*≥6.2  –  <6.6.72
linuxlinux_kernel*≥6.7  –  <6.12.10
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any

References 6

  • git.kernel.org https://git.kernel.org/stable/c/1dc5da6c4178f3e4b95c631418f72de9f86c0449
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/284a221f8fa503628432c7bb5108277c688c6ffa
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/44ee8635922b6eb940faddb961a8347c6857d722
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6259d2484d0ceff42245d1f09cc8cb6ee72d847a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bcf8c60074e81ed2ac2d35130917175a3949c917
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1dc5da6c4178f3e4b95c631418f72de9f86c0449
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/284a221f8fa503628432c7bb5108277c688c6ffa
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/44ee8635922b6eb940faddb961a8347c6857d722
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6259d2484d0ceff42245d1f09cc8cb6ee72d847a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bcf8c60074e81ed2ac2d35130917175a3949c917
    Patch