CVE-2026-98301
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.
Affected versions
Linux kernel versions
6.1.93,
6.6.33,
6.8.12,
6.9.3,
6.10
and later are affected. Fixed in
6.1.189,
6.6.158,
6.12.112,
6.18.54,
7.2.8,
7.3-rc4
and their respective stable series.
References
6 totalFrequently asked questions
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What is CVE-2026-98301?
CVE-2026-98301 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.1.93 onward and has been patched in 6.1.189, 6.6.158, 6.12.112 and others. CVE-2026-98301 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-98301?
Yes. CVE-2026-98301 has been patched. Fixed versions include 6.1.189, 6.6.158, 6.12.112 and others. If you are running Linux kernel 6.1.93 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98301 actively exploited?
No. CVE-2026-98301 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.