CVE-2025-21759

CVE Details

Release Date:2025-02-27
Impact:Moderate What is this?

Description


In 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.

See more information about CVE-2025-21759 from MITRE CVE dictionary and NIST NVD


NOTE: The following CVSS metrics and score provided are preliminary and subject to review.


CVSS v3 metrics

Base Score: 6.6
Vector String: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Version: 3.1
Attack Vector: Local
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality Impact: Low
Integrity Impact: Low
Availability Impact: High

Errata information


PlatformErrataRelease Date
Oracle Linux version 10 (kernel) ELSA-2025-103712025-07-08
Oracle Linux version 10 (kernel-uek) ELSA-2025-204802025-07-17
Oracle Linux version 10 (kernel-uek) ELSA-2025-205302025-08-18
Oracle Linux version 8 (kernel) ELSA-2025-135892025-08-11
Oracle Linux version 9 (kernel) ELSA-2025-103792025-07-07
Oracle Linux version 9 (kernel-uek) ELSA-2025-204802025-07-17
Oracle Linux version 9 (kernel-uek) ELSA-2025-205302025-08-18


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