Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.26, < 5.15.179 |
References
- https://git.kernel.org/stable/c/1b91c597b0214b1b462eb627ec02658c944623f2Patch
- https://git.kernel.org/stable/c/25195f9d5ffcc8079ad743a50c0409dbdc48d98aPatch
- https://git.kernel.org/stable/c/29fa42197f26a97cde29fa8c40beddf44ea5c8f3Patch
- https://git.kernel.org/stable/c/a527750d877fd334de87eef81f1cb5f0f0ca3373Patch
- https://git.kernel.org/stable/c/d60d493b0e65647e0335e6a7c4547abcea7df8e9Patch
- https://git.kernel.org/stable/c/e8af3632a7f2da83e27b083f787bced1faba00b1Patch
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
FAQ
What is CVE-2025-21758?
CVE-2025-21758 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 long...
How severe is CVE-2025-21758?
CVE-2025-21758 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-21758?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.