Riskcovery

CVE-2026-98301

net: bridge: mst: move switchdev call outside rcu

State
Published
Severity
Not scored
Published
Oct 6, 2026
Updated
Oct 19, 2026
Reserved
Sep 25, 2026

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 8ca9a750fc711911ef616ceb627d07357b04545e to before b9661fd2423fc25e91e0517ecc0b6156ad83e3a8Affected
  • 4488617e5e995a09abe4d81add5fb165674edb59 to before 6b431b63219853eef4054e2f1cb073d2ca2059b4Affected
  • 3a7c1661ae1383364cd6092d851f5e5da64d476b to before abf734d150c61acfdfee102169d0e5d1c482e285Affected
  • 3a7c1661ae1383364cd6092d851f5e5da64d476b to before d5c4ee1fa4e83a12afc051c831936cd8e006cde3Affected
  • 3a7c1661ae1383364cd6092d851f5e5da64d476b to before c40ed3e884c8dc0350f26484030438ef24208ff1Affected
  • 3a7c1661ae1383364cd6092d851f5e5da64d476b to before 18a6fe05fb6e18de29fa90d388bb34044114b3d8Affected
  • a2b01e65d9ba8af2bb086d3b7288ca53a07249acAffected
  • e43dd2b1ec746e105b7db5f9ad6ef14685a615a4Affected
  • 6.1.93 to before 6.1.189Affected
  • 6.6.33 to before 6.6.158Affected
  • 6.8.12 to before 6.9Affected
  • 6.9.3 to before 6.10Affected
LinuxLinux
  • 6.10Affected
  • before 6.10Not affected
  • 6.1.189 through 6.1.*Not affected
  • 6.6.158 through 6.6.*Not affected
  • 6.12.112 through 6.12.*Not affected
  • 6.18.54 through 6.18.*Not affected
  • 7.2.8 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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