Bug 2348531 (CVE-2025-21758) - CVE-2025-21758 kernel: ipv6: mcast: add RCU protection to mld_newpack()
Summary: CVE-2025-21758 kernel: ipv6: mcast: add RCU protection to mld_newpack()
Keywords:
Status: NEW
Alias: CVE-2025-21758
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-02-27 03:02 UTC by OSIDB Bzimport
Modified: 2025-05-19 09:09 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2025-02-27 03:02:15 UTC 
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.
Comment 1 Michal Findra 2025-02-27 15:44:20 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022604-CVE-2025-21758-9f8c@gregkh/T
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