CVE-2025-21758

ipv6: mcast: add RCU protection to mld_newpack()

Description

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.

N/A

CVSS

Severity:

EPSS 0.07%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/29fa42197f26a97cde29fa8c40beddf44ea5c8f3
https://git.kernel.org/stable/c/e8af3632a7f2da83e27b083f787bced1faba00b1
https://git.kernel.org/stable/c/1b91c597b0214b1b462eb627ec02658c944623f2
https://git.kernel.org/stable/c/25195f9d5ffcc8079ad743a50c0409dbdc48d98a
https://git.kernel.org/stable/c/d60d493b0e65647e0335e6a7c4547abcea7df8e9
https://git.kernel.org/stable/c/a527750d877fd334de87eef81f1cb5f0f0ca3373

Frequently Asked Questions

What is the severity of CVE-2025-21758?: CVE-2025-21758 has not yet been assigned a CVSS score.
How to fix CVE-2025-21758?: To fix CVE-2025-21758, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21758 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-21758 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21758?: CVE-2025-21758 affects Linux Linux, Linux Linux.

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