CVE-2025-21758ipv6: mcast: add RCU protection to mld_newpack()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
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
- https://git.kernel.org/stable/c/29fa42197f26a97cde29fa8c40beddf44ea5c8f3patch
- https://git.kernel.org/stable/c/e8af3632a7f2da83e27b083f787bced1faba00b1patch
- https://git.kernel.org/stable/c/1b91c597b0214b1b462eb627ec02658c944623f2patch
- https://git.kernel.org/stable/c/25195f9d5ffcc8079ad743a50c0409dbdc48d98apatch
- https://git.kernel.org/stable/c/d60d493b0e65647e0335e6a7c4547abcea7df8e9patch
- https://git.kernel.org/stable/c/a527750d877fd334de87eef81f1cb5f0f0ca3373patch
- 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
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
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.