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[ CVE-2026-98026 · Published 25 Sep 2026 ]

Vulnerability in Linux

Not scored yet EPSS <1%3 agency advisoriesNo fix listed yet

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: net: bridge: mcast: properly convert mglist to rcu Sashiko reported a bug [1] that br_multicast_del_port_group unlists the port group not using proper rcu helper that preserves the next pointer and after that immediately frees the port group without waiting for rcu grace period. The only rcu walker of mglist is br_multicast_list_adjacent() and it turns out that function has always been buggy because mglist was never properly converted to RCU. Fix it by converting it to rcu and moving its initialization after eth_addr's. Initializing p->next can use RCU_INIT_POINTER because we have a barrier from the hlist_add_head_rcu call later, besides we're initializing an unpublished structure anyway. [1] https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260826014200.362304-1-littleddfu%40gmail.com

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

  • CERT-FRCERTFR-2026-AVI-1289

    Multiple vulnerabilities in the Debian LTS Linux kernel Translated from French

    Multiple vulnerabilities have been discovered in the Debian LTS Linux kernel. Some of them allow an attacker to cause privilege escalation, a breach of data confidentiality and denial of service.

    CVE-2025-38237CVE-2025-39833CVE-2025-39925+1311 more CVEs
  • CERT-FRCERTFR-2026-AVI-1253

    Multiple vulnerabilities in the Debian Linux kernel Translated from French

    Multiple vulnerabilities have been discovered in the Debian Linux kernel. Some of them allow an attacker to cause privilege escalation, a breach of data confidentiality and denial of service.

    CVE-2025-38237CVE-2025-39833CVE-2025-39925+1310 more CVEs
  • BSI CERT-BundWID-SEC-2026-3579

    Linux Kernel: Multiple vulnerabilities Translated from German

    CVE-2026-97615CVE-2026-97978CVE-2026-98127+590 more CVEs

[ References ]References