CVE-2025-21637

MEDIUM EPSS 10.8%
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: sctp: sysctl: udp_port: 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, but that would increase the size of this fix, while 'sctp.ctl_sock' still needs to be retrieved from 'net' structure.

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*≥5.11  –  <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/0a0966312ac3eedd7f5f2a766ed4702df39a9a65
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/55627918febdf9d71107a1e68d1528dc591c9a15
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5b77d73f3be5102720fb685b9e6900e3500e1096
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c10377bbc1972d858eaf0ab366a311b39f8ef1b6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e919197fb8616331f5dc81e4c3cc3d12769cb725
    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/0a0966312ac3eedd7f5f2a766ed4702df39a9a65
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/55627918febdf9d71107a1e68d1528dc591c9a15
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5b77d73f3be5102720fb685b9e6900e3500e1096
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c10377bbc1972d858eaf0ab366a311b39f8ef1b6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e919197fb8616331f5dc81e4c3cc3d12769cb725
    Patch