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Vulnerability record · CVE-2025-21758 · published 27 February 2025

CVE-2025-21758: Linux kernel vulnerability

Linux · Linux Kernel

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.

5.5 CVSS 3.1 Medium EPSS 14% · top 3.6%
5.5CVSS 3.1 base score
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
30 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/1b91c597b0214b1b462eb627ec02658c944623f2 Patch
https://git.kernel.org/stable/c/25195f9d5ffcc8079ad743a50c0409dbdc48d98a Patch
https://git.kernel.org/stable/c/29fa42197f26a97cde29fa8c40beddf44ea5c8f3 Patch
https://git.kernel.org/stable/c/a527750d877fd334de87eef81f1cb5f0f0ca3373 Patch
https://git.kernel.org/stable/c/d60d493b0e65647e0335e6a7c4547abcea7df8e9 Patch
https://git.kernel.org/stable/c/e8af3632a7f2da83e27b083f787bced1faba00b1 Patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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Source: NIST National Vulnerability Database (record CVE-2025-21758), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.