CVE-2025-21641

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-21641
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().

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/4c74fbdc5ab95b13945be01e6065940b68222db7 Mailing List Patch
https://git.kernel.org/stable/c/92cf7a51bdae24a32c592adcdd59a773ae149289 Mailing List Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
History

01 Oct 2025, 20:18

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mptcp: sysctl: blackhole timeout: avoid using current->nsproxy Como se mencionó en el commit anterior, no se recomienda usar la estructura 'net' a través de 'current' por diferentes razones: - Inconsistencia: obtener información de las redes de red del lector/escritor frente a solo de las redes de red del abridor. - current->nsproxy puede ser NULL en algunos casos, lo que resulta en un 'Oops' (null-ptr-deref), por ejemplo, cuando la tarea actual está saliendo, como lo detectó syzbot [1] usando acct(2). La estructura 'pernet' se puede obtener de table->data usando Container_of().
CPE cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/4c74fbdc5ab95b13945be01e6065940b68222db7 - () https://git.kernel.org/stable/c/4c74fbdc5ab95b13945be01e6065940b68222db7 - Mailing List, Patch
References () https://git.kernel.org/stable/c/92cf7a51bdae24a32c592adcdd59a773ae149289 - () https://git.kernel.org/stable/c/92cf7a51bdae24a32c592adcdd59a773ae149289 - Mailing List, Patch
CWE CWE-476
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux linux Kernel
Linux

19 Jan 2025, 11:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-01-19 11:15

Updated : 2025-10-01 20:18

NVD link : CVE-2025-21641

Mitre link : CVE-2025-21641

CVE.ORG link : CVE-2025-21641

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference