CVE-2025-21638

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-21638
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: auth_enable: 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/15649fd5415eda664ef35780c2013adeb5d9c695 Patch
https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3 Patch
https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 Patch
https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e Patch
https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36 Patch
https://git.kernel.org/stable/c/cf387cdebfaebae228dfba162f94c567a67610c3
https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382 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:*:*:*:*:*:*:*:*
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

10 Apr 2025, 13:15

Type Values Removed Values Added
References
  • {'url': 'https://git.kernel.org/stable/c/10c869a52f266e40f548cc3c565d14930a5edafc', 'tags': ['Patch'], 'source': '416baaa9-dc9f-4396-8d5f-8c081fb06d67'}
  • () https://git.kernel.org/stable/c/cf387cdebfaebae228dfba162f94c567a67610c3 -

27 Feb 2025, 21:59

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
CWE CWE-476
References () https://git.kernel.org/stable/c/10c869a52f266e40f548cc3c565d14930a5edafc - () https://git.kernel.org/stable/c/10c869a52f266e40f548cc3c565d14930a5edafc - Patch
References () https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695 - () https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695 - Patch
References () https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3 - () https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3 - Patch
References () https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 - () https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 - Patch
References () https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e - () https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e - Patch
References () https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36 - () https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36 - Patch
References () https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382 - () https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382 - Patch

02 Feb 2025, 11:15

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/10c869a52f266e40f548cc3c565d14930a5edafc -
  • () https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382 -

23 Jan 2025, 17:15

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sctp: sysctl: auth_enable: 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'.
References
  • () https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e -

19 Jan 2025, 11:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-01-19 11:15

Updated : 2025-04-10 13:15

NVD link : CVE-2025-21638

Mitre link : CVE-2025-21638

CVE.ORG link : CVE-2025-21638

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference