CVE-2025-21759

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  3. CVE-2025-21759

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

I

n the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: extend RCU protection in igmp6_send() igmp6_send() can be called without RTNL or RCU being held. Extend RCU protection so that we can safely fetch the net pointer and avoid a potential UAF. Note that we no longer can use sock_alloc_send_skb() because ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep. Instead use alloc_skb() and charge the net->ipv6.igmp_sk socket under RCU protection.

References
Link Resource
https://git.kernel.org/stable/c/087c1faa594fa07a66933d750c0b2610aa1a2946 Patch
https://git.kernel.org/stable/c/0bf8e2f3768629d437a32cb824149e6e98254381 Patch
https://git.kernel.org/stable/c/81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a Patch
https://git.kernel.org/stable/c/8e92d6a413feaf968a33f0b439ecf27404407458 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:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
History

24 Mar 2025, 17:33

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv6: mcast: extender la protección RCU en igmp6_send() igmp6_send() se puede llamar sin que se mantenga RTNL o RCU. Extienda la protección RCU para que podamos obtener de forma segura el puntero de red y evitar un posible UAF. Tenga en cuenta que ya no podemos usar sock_alloc_send_skb() porque ipv6.igmp_sk usa asignaciones GFP_KERNEL que pueden dormir. En su lugar, use alloc_skb() y cargue el socket net->ipv6.igmp_sk bajo la protección RCU.
References () https://git.kernel.org/stable/c/087c1faa594fa07a66933d750c0b2610aa1a2946 - () https://git.kernel.org/stable/c/087c1faa594fa07a66933d750c0b2610aa1a2946 - Patch
References () https://git.kernel.org/stable/c/0bf8e2f3768629d437a32cb824149e6e98254381 - () https://git.kernel.org/stable/c/0bf8e2f3768629d437a32cb824149e6e98254381 - Patch
References () https://git.kernel.org/stable/c/81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a - () https://git.kernel.org/stable/c/81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a - Patch
References () https://git.kernel.org/stable/c/8e92d6a413feaf968a33f0b439ecf27404407458 - () https://git.kernel.org/stable/c/8e92d6a413feaf968a33f0b439ecf27404407458 - Patch
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

27 Feb 2025, 18:15

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
CWE CWE-416

27 Feb 2025, 03:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-27 03:15

Updated : 2025-03-24 17:33

NVD link : CVE-2025-21759

Mitre link : CVE-2025-21759

CVE.ORG link : CVE-2025-21759

JSON object : View

Products Affected

linux

CWE
CWE-416

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