CVE-2025-21637

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-21637
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.

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/0a0966312ac3eedd7f5f2a766ed4702df39a9a65 Patch
https://git.kernel.org/stable/c/55627918febdf9d71107a1e68d1528dc591c9a15 Patch
https://git.kernel.org/stable/c/5b77d73f3be5102720fb685b9e6900e3500e1096 Patch
https://git.kernel.org/stable/c/c10377bbc1972d858eaf0ab366a311b39f8ef1b6 Patch
https://git.kernel.org/stable/c/e919197fb8616331f5dc81e4c3cc3d12769cb725 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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

27 Feb 2025, 21:59

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0a0966312ac3eedd7f5f2a766ed4702df39a9a65 - () https://git.kernel.org/stable/c/0a0966312ac3eedd7f5f2a766ed4702df39a9a65 - Patch
References () https://git.kernel.org/stable/c/55627918febdf9d71107a1e68d1528dc591c9a15 - () https://git.kernel.org/stable/c/55627918febdf9d71107a1e68d1528dc591c9a15 - Patch
References () https://git.kernel.org/stable/c/5b77d73f3be5102720fb685b9e6900e3500e1096 - () https://git.kernel.org/stable/c/5b77d73f3be5102720fb685b9e6900e3500e1096 - Patch
References () https://git.kernel.org/stable/c/c10377bbc1972d858eaf0ab366a311b39f8ef1b6 - () https://git.kernel.org/stable/c/c10377bbc1972d858eaf0ab366a311b39f8ef1b6 - Patch
References () https://git.kernel.org/stable/c/e919197fb8616331f5dc81e4c3cc3d12769cb725 - () https://git.kernel.org/stable/c/e919197fb8616331f5dc81e4c3cc3d12769cb725 - Patch
CPE 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
CWE CWE-476
First Time Linux linux Kernel
Linux
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5

23 Jan 2025, 17:15

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/0a0966312ac3eedd7f5f2a766ed4702df39a9a65 -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: sysctl: udp_port: evitar usar current->nsproxy Como se mencionó en un commit anterior de esta serie, no se recomienda usar la estructura 'net' a través de 'current' por diferentes razones: - Inconsistencia: obtener información de los netns del lector/escritor vs solo de los netns del abridor. - current->nsproxy puede ser NULL en algunos casos, lo que resulta en un 'Oops' (null-ptr-deref), p. ej. cuando la tarea actual está saliendo, como lo detectó syzbot [1] usando acct(2). La estructura 'net' se puede obtener de table->data usando Container_of(). Tenga en cuenta que table->data también se puede usar directamente, pero eso aumentaría el tamaño de esta corrección, mientras que 'sctp.ctl_sock' aún necesita ser recuperado de la estructura 'net'.

19 Jan 2025, 11:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-01-19 11:15

Updated : 2025-02-27 21:59

NVD link : CVE-2025-21637

Mitre link : CVE-2025-21637

CVE.ORG link : CVE-2025-21637

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference