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CVE-2025-21759

ipv6: mcast: extend RCU protection in igmp6_send()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.79, 6.12.16, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 · fixed in 638e8fe3563a82f298fe537a28d5342a97278cf1; From b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 · fixed in 6901bbb169e3add6c037218d996790cef6b3d650; From b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 · fixed in 7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff; From b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 · fixed in 81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a; From b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 · fixed in 0bf8e2f3768629d437a32cb824149e6e98254381; From b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 · fixed in 8e92d6a413feaf968a33f0b439ecf27404407458; From b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 · fixed in 087c1faa594fa07a66933d750c0b2610aa1a2946

  • Linux Linux

    2.6.26

  • KernelLinux

    From 2.6.26 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.79; From 6.7.0 · fixed in 6.12.16; From 6.13.0 · fixed in 6.13.4

References 7

git.kernel.org