In the Linux kernel, the following vulnerability has been resolved:
net: bridge: mst: move switchdev call outside rcu
This is a follow-up of one of sashiko's pre-existing bug reports. br_mst_set_state() calls switchdev_port_attr_set() for nonzero MSTIs while holding rcu_read_lock() which invokes the blocking switchdev notifier chain and may sleep. Nonzero MSTI changes come from netlink with rtnl held. Move the switchdev call before entering the rcu section and assert that rtnl is held.
The call cannot be deferred because netlink needs its error and extack. Also DSA reads the old bridge MST state during the callback and checks it. A deferred callback will be late and will see the updated state.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-toolsUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-modules-extra-commonUpgrade kernelUpgrade perf-debuginfoUpgrade microvm-kernelUpgrade kernel-headersUpgrade perfUpgrade bpftool-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-modules-extraUpgrade python3-perfUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade bpftoolUpgrade kernel-tools-develUpgrade kernel-livepatch-6.1.189-236.399Upgrade kernel-devel | Nov 2, 2026 | Oct 6, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Oct 20, 2026 | Oct 6, 2026 |
| Redhat_linux | — | No solution exists | Oct 13, 2026 | Oct 6, 2026 |
| Ubuntu | — | Upgrade linux-ibmUpgrade linux-hwe-7.0Upgrade linux-oracleUpgrade linux-riscv-7.0Upgrade linux-oem-7.0Upgrade linuxUpgrade linux-gcpUpgrade linux-riscvUpgrade linux-aws | Nov 3, 2026 | Oct 6, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 13, 2026 | Oct 6, 2026 |
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