CVE-2025-21758

What it is

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: add RCU protection to mld_newpack() mld_newpack() can be called without RTNL or RCU being held. 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.

At a glance

Exploitability

Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.

Exploit odds

16.9% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2025-02-27 03:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-15 02:17 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 16.9% in the next 30 days (EPSS).
• Severity: 7.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2025-02-27 03:15 UTC

Last modified

2026-10-15 02:17 UTC

Exploit probability

16.9% · EPSS, next 30 days

Record status

Modified

Affected

• Linux Kernel < 5.15.179
• Linux Kernel < 6.1.129
• Linux Kernel < 6.6.79
• Linux Kernel < 6.12.16
• Linux Kernel < 6.13.4
• Linux Kernel 6.14

Attack profile CVSS 3.1 · 7.8

Attack vector

Local

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2025-21758.md and follow it. Check whether this project is affected by CVE-2025-21758. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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