VULNERABILITY

Amazon Linux AMI: CVE-2025-21759: Security patch for kernel (ALAS-2025-1973)

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Amazon Linux AMI: CVE-2025-21759: Security patch for kernel (ALAS-2025-1973)

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
02/27/2025
Created
05/27/2025
Added
05/22/2025
Modified
05/30/2025

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.

Solution(s)

  • amazon-linux-upgrade-kernel

References

  • ALAS-2025-1973
  • CVE-2025-21759

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