Not yet scoredPublished Oct 6, 2026

CVE-2026-98301net: bridge: mst: move switchdev call outside rcu

Updated under an hour ago (Oct 27, 2026, 1:40 AM ET)

Does this affect you?

It affects Linux. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 8ca9a750fc711911ef616ceb627d07357b04545e before b9661fd2423fc25e91e0517ecc0b6156ad83e3a8; 4488617e5e995a09abe4d81add5fb165674edb59 builds before 6b431b63219853eef4054e2f1cb073d2ca2059b4; from 3a7c1661ae1383364cd6092d851f5e5da64d476b before abf734d150c61acfdfee102169d0e5d1c482e285; from 3a7c1661ae1383364cd6092d851f5e5da64d476b before d5c4ee1fa4e83a12afc051c831936cd8e006cde3; from 3a7c1661ae1383364cd6092d851f5e5da64d476b before c40ed3e884c8dc0350f26484030438ef24208ff1; from 3a7c1661ae1383364cd6092d851f5e5da64d476b before 18a6fe05fb6e18de29fa90d388bb34044114b3d8; a2b01e65d9ba8af2bb086d3b7288ca53a07249ac; e43dd2b1ec746e105b7db5f9ad6ef14685a615a4; and 4 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/b9661fd2423fc25e91e0517ecc0b6156ad83e3a8
https://git.kernel.org/stable/c/6b431b63219853eef4054e2f1cb073d2ca2059b4
https://git.kernel.org/stable/c/abf734d150c61acfdfee102169d0e5d1c482e285
https://git.kernel.org/stable/c/d5c4ee1fa4e83a12afc051c831936cd8e006cde3
https://git.kernel.org/stable/c/c40ed3e884c8dc0350f26484030438ef24208ff1
https://git.kernel.org/stable/c/18a6fe05fb6e18de29fa90d388bb34044114b3d8

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.