UnratedFix available
net: bridge: mst: move switchdev call outside rcu
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.1.189, 6.12.112, 6.18.54, 6.6.158, 7.2.8
- CVEs
- CVE-2026-98301
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 04:02 UTC · Revision 1
Source evidence
net: bridge: mst: move switchdev call outside rcu
core-osv · Original sourcePublished 6 Oct 2026, 08:45 UTC
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.
osv:CVE-2026-98301
Kernel
Fixed versions: 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8
Complete source record
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"title": "net: bridge: mst: move switchdev call outside rcu",
"summary": "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.",
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