CVE-2026-98301
Description
AI Translation Available
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.
https://git.kernel.org/stable/c/18a6fe05fb6e18de29fa90d388bb34044114b3d8
https://git.kernel.org/stable/c/6b431b63219853eef4054e2f1cb073d2ca2059b4
https://git.kernel.org/stable/c/abf734d150c61acfdfee102169d0e5d1c482e285
https://git.kernel.org/stable/c/b9661fd2423fc25e91e0517ecc0b6156ad83e3a8
https://git.kernel.org/stable/c/c40ed3e884c8dc0350f26484030438ef24208ff1
https://git.kernel.org/stable/c/d5c4ee1fa4e83a12afc051c831936cd8e006cde3