CVE-2025-21759
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedFeb 27, 2025
First seenFeb 27, 2025
Weakness typeCWE-416Use after free
How to fix
Update
- linux linux_kernel6.6.79, 6.12.16, 6.13.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.26 ≤ v < 6.6.79, 6.7 ≤ v < 6.12.16, 6.13 ≤ v < 6.13.4, 6.14 | 6.6.79, 6.12.16, 6.13.4 |
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