High 7.8Published Feb 26, 2025

CVE-2025-21758ipv6: mcast: add RCU protection to mld_newpack()

Updated under an hour ago (Oct 27, 2026, 1:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 before 29fa42197f26a97cde29fa8c40beddf44ea5c8f3; from b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 before e8af3632a7f2da83e27b083f787bced1faba00b1; from b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 before 1b91c597b0214b1b462eb627ec02658c944623f2; from b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 before 25195f9d5ffcc8079ad743a50c0409dbdc48d98a; from b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 before d60d493b0e65647e0335e6a7c4547abcea7df8e9; from b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 before a527750d877fd334de87eef81f1cb5f0f0ca3373	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.26 before 5.15.179; from 5.16 before 6.1.129; from 6.2 before 6.6.79; from 6.7 before 6.12.16; from 6.13 before 6.13.4; 6.14; 6.14	NVD

References

References

https://git.kernel.org/stable/c/29fa42197f26a97cde29fa8c40beddf44ea5c8f3	patch
https://git.kernel.org/stable/c/e8af3632a7f2da83e27b083f787bced1faba00b1	patch
https://git.kernel.org/stable/c/1b91c597b0214b1b462eb627ec02658c944623f2	patch
https://git.kernel.org/stable/c/25195f9d5ffcc8079ad743a50c0409dbdc48d98a	patch
https://git.kernel.org/stable/c/d60d493b0e65647e0335e6a7c4547abcea7df8e9	patch
https://git.kernel.org/stable/c/a527750d877fd334de87eef81f1cb5f0f0ca3373	patch
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
https://cert-portal.siemens.com/productcert/html/ssa-457936.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.