CVE-2025-21758
Medium
Elevated severity or exploit probability.
CVSS base
7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
13.7%
96.3th percentile
CISA KEV
Not listed
Weakness / dates
—
Published 2025-02-27 · modified 2026-07-30
CVSS breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
| Attack Vector | L | Local |
| Attack Complexity | L | Low |
| Privileges Required | L | Low |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | H | High |
Timeline
- 2025-02-27 — Published (NVD)
- 2026-07-30 — Last modified (NVD)
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.
Affected
References
- https://git.kernel.org/stable/c/1b91c597b0214b1b462eb627ec02658c944623f2
- https://git.kernel.org/stable/c/25195f9d5ffcc8079ad743a50c0409dbdc48d98a
- https://git.kernel.org/stable/c/29fa42197f26a97cde29fa8c40beddf44ea5c8f3
- https://git.kernel.org/stable/c/a527750d877fd334de87eef81f1cb5f0f0ca3373
- https://git.kernel.org/stable/c/d60d493b0e65647e0335e6a7c4547abcea7df8e9
- https://git.kernel.org/stable/c/e8af3632a7f2da83e27b083f787bced1faba00b1
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html