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CVE-2026-98301

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Last modified

CVE-2026-98301 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 8ca9a750fc711911ef616ceb627d07357b04545e, < b9661fd2423fc25e91e0517ecc0b6156ad83e3a8; >= 4488617e5e995a09abe4d81add5fb165674edb59, < 6b431b63219853eef4054e2f1cb073d2ca2059b4; >= 3a7c1661ae1383364cd6092d851f5e5da64d476b, < abf734d150c61acfdfee102169d0e5d1c482e285; >= 3a7c1661ae1383364cd6092d851f5e5da64d476b, < d5c4ee1fa4e83a12afc051c831936cd8e006cde3; >= 3a7c1661ae1383364cd6092d851f5e5da64d476b, < c40ed3e884c8dc0350f26484030438ef24208ff1; >= 3a7c1661ae1383364cd6092d851f5e5da64d476b, < 18a6fe05fb6e18de29fa90d388bb34044114b3d8; a2b01e65d9ba8af2bb086d3b7288ca53a07249ac; e43dd2b1ec746e105b7db5f9ad6ef14685a615a4; >= 6.1.93, < 6.1.189; >= 6.6.33, < 6.6.158; >= 6.8.12, < 6.9; >= 6.9.3, < 6.10
LinuxLinux6.10

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-98301?
Severity scoring for CVE-2026-98301 is pending analysis.
How do I fix CVE-2026-98301?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST