CVE-2025-21758
HIGH severity · CVSS 7.8
7.8CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)13%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/1b91c597b0214b1b462eb627ec02658c944623f2 ↗
Additional information
- NVD record
- 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-019113.html