CVE-2025-38089

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  3. CVE-2025-38089

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

I

n the Linux kernel, the following vulnerability has been resolved: sunrpc: handle SVC_GARBAGE during svc auth processing as auth error tianshuo han reported a remotely-triggerable crash if the client sends a kernel RPC server a specially crafted packet. If decoding the RPC reply fails in such a way that SVC_GARBAGE is returned without setting the rq_accept_statp pointer, then that pointer can be dereferenced and a value stored there. If it's the first time the thread has processed an RPC, then that pointer will be set to NULL and the kernel will crash. In other cases, it could create a memory scribble. The server sunrpc code treats a SVC_GARBAGE return from svc_authenticate or pg_authenticate as if it should send a GARBAGE_ARGS reply. RFC 5531 says that if authentication fails that the RPC should be rejected instead with a status of AUTH_ERR. Handle a SVC_GARBAGE return as an AUTH_ERROR, with a reason of AUTH_BADCRED instead of returning GARBAGE_ARGS in that case. This sidesteps the whole problem of touching the rpc_accept_statp pointer in this situation and avoids the crash.

References
Link Resource
https://git.kernel.org/stable/c/353e75b55e583635bf71cde6abcec274dba05edd Patch
https://git.kernel.org/stable/c/599c489eea793821232a2f69a00fa57d82b0ac98 Patch
https://git.kernel.org/stable/c/94d10a4dba0bc482f2b01e39f06d5513d0f75742 Patch
https://git.kernel.org/stable/c/c90459cd58bb421d275337093d8e901e0ba748dd Patch
https://github.com/keymaker-arch/NFSundown Exploit Patch
https://www.openwall.com/lists/oss-security/2025/07/02/2 Mailing List
http://www.openwall.com/lists/oss-security/2025/07/02/2 Mailing List
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:6.4:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.4:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.4:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.4:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.4:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.4:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*
History

19 Nov 2025, 12:56

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:6.4:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.4:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.4:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.4:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.4:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.4:rc7:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
CWE CWE-476
References () https://git.kernel.org/stable/c/353e75b55e583635bf71cde6abcec274dba05edd - () https://git.kernel.org/stable/c/353e75b55e583635bf71cde6abcec274dba05edd - Patch
References () https://git.kernel.org/stable/c/599c489eea793821232a2f69a00fa57d82b0ac98 - () https://git.kernel.org/stable/c/599c489eea793821232a2f69a00fa57d82b0ac98 - Patch
References () https://git.kernel.org/stable/c/94d10a4dba0bc482f2b01e39f06d5513d0f75742 - () https://git.kernel.org/stable/c/94d10a4dba0bc482f2b01e39f06d5513d0f75742 - Patch
References () https://git.kernel.org/stable/c/c90459cd58bb421d275337093d8e901e0ba748dd - () https://git.kernel.org/stable/c/c90459cd58bb421d275337093d8e901e0ba748dd - Patch
References () https://github.com/keymaker-arch/NFSundown - () https://github.com/keymaker-arch/NFSundown - Exploit, Patch
References () https://www.openwall.com/lists/oss-security/2025/07/02/2 - () https://www.openwall.com/lists/oss-security/2025/07/02/2 - Mailing List
References () http://www.openwall.com/lists/oss-security/2025/07/02/2 - () http://www.openwall.com/lists/oss-security/2025/07/02/2 - Mailing List
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5

04 Nov 2025, 22:16

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2025/07/02/2 -

03 Jul 2025, 09:15

Type Values Removed Values Added
References
  • () https://github.com/keymaker-arch/NFSundown -
  • () https://www.openwall.com/lists/oss-security/2025/07/02/2 -

30 Jun 2025, 18:38

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sunrpc: manejo de SVC_GARBAGE durante el procesamiento de autenticación de servicio como error de autenticación. Tianshuo Han informó de un fallo que se puede activar de forma remota si el cliente envía a un servidor RPC del kernel un paquete especialmente manipulado. Si la decodificación de la respuesta RPC falla de tal manera que se devuelve SVC_GARBAGE sin establecer el puntero rq_accept_statp, se puede desreferenciar ese puntero y almacenar un valor allí. Si es la primera vez que el hilo procesa una RPC, ese puntero se establecerá en NULL y el kernel se bloqueará. En otros casos, podría crear un garabato de memoria. El código del servidor sunrpc trata una devolución de SVC_GARBAGE de svc_authenticate o pg_authenticate como si debiera enviar una respuesta GARBAGE_ARGS. El RFC 5531 indica que si la autenticación falla, la RPC debe rechazarse con un estado de AUTH_ERR. Tratar una devolución de SVC_GARBAGE como AUTH_ERROR, con el motivo AUTH_BADCRED, en lugar de devolver GARBAGE_ARGS en ese caso. Esto evita el problema de tocar el puntero rpc_accept_statp en esta situación y evita el bloqueo.

30 Jun 2025, 08:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-06-30 08:15

Updated : 2025-11-19 12:56

NVD link : CVE-2025-38089

Mitre link : CVE-2025-38089

CVE.ORG link : CVE-2025-38089

JSON object : View

Products Affected

linux

CWE
CWE-476

NULL Pointer Dereference