CVE-2026-98347

Summary

In the Linux kernel, the following vulnerability has been resolved:

IB/IPoIB: Avoid restoring OPER_UP after multicast flush

ipoib_ib_dev_flush_light() temporarily clears IPOIB_FLAG_OPER_UP to prevent multicast joins while ipoib_mcast_dev_flush() is running, and restores the flag afterwards if it was previously set.

This restore races with ipoib_ib_dev_down(). If the interface is brought down while the flush is in progress, ipoib_ib_dev_down() clears IPOIB_FLAG_OPER_UP, but the flush path may set it again after the device has already gone down.

Since commit 894021a75291 ("IB/ipoib: Make the carrier_on_task race aware"), ipoib_mcast_carrier_on_task() relies on IPOIB_FLAG_OPER_UP being cleared to terminate its rtnl_trylock() retry loop. If the flag is left set after shutdown, the workqueue retries forever, causing teardown to deadlock when ipoib_ndo_uninit() waits in destroy_workqueue() while holding RTNL.

Instead of overloading IPOIB_FLAG_OPER_UP to block multicast joins during a light flush, introduce a dedicated IPOIB_FLAG_MCAST_FLUSH flag. Use it together with IPOIB_FLAG_OPER_UP to determine whether multicast joins are allowed, avoiding the race with device shutdown.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux344bacca8cd811809fc33a249f2738ab757d327f < f973769fb7cb33ba0d4a64b7dcfee0cabaead938affected
LinuxLinux344bacca8cd811809fc33a249f2738ab757d327f < b72f38929f4b5aa83161fd3b22a7327207e51ec5affected
LinuxLinux344bacca8cd811809fc33a249f2738ab757d327f < 1b11e4b55b41d9e69a8e8d07622614202e2eaca9affected
LinuxLinux344bacca8cd811809fc33a249f2738ab757d327f < 326f7d34bd7e64de535566b65c0533b640df5a81affected
LinuxLinux344bacca8cd811809fc33a249f2738ab757d327f < 5ad925d45f28464a5e043c9620880bb6a030da89affected
LinuxLinux344bacca8cd811809fc33a249f2738ab757d327f < 188b334a6db36a8e0bfaaf59bc4020639a0f3aadaffected
LinuxLinux344bacca8cd811809fc33a249f2738ab757d327f < 1ff3add37c329704ec46181b4ae4f00f9f16ce6faffected
LinuxLinux344bacca8cd811809fc33a249f2738ab757d327f < 9a141d3dc869d18b2eab35e999f4790a9b84e40faffected
LinuxLinuxa289c65ca49d2680a3d797e633e57a45573d1df2affected
LinuxLinuxb81459c78935e4579a577b2366c5f8878d3c7feeaffected
LinuxLinux8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5affected
LinuxLinuxdfe809702a11bd7fb91c882fb55620e39ce22109affected
LinuxLinux87160fb51bc343793cc8f5f031a87f1a35aecb82affected
LinuxLinux749fd55dd210f9676f0d445a6efaaa3bec65174aaffected
LinuxLinux3.2.84 < 3.3affected
LinuxLinux3.10.105 < 3.11affected
LinuxLinux3.12.65 < 3.13affected
LinuxLinux3.16.39 < 3.17affected
LinuxLinux4.4.24 < 4.5affected
LinuxLinux4.7.7 < 4.8affected
LinuxLinux4.8affected
LinuxLinux0 < 4.8unaffected
LinuxLinux5.10.271 <= 5.10.*unaffected
LinuxLinux5.15.222 <= 5.15.*unaffected
LinuxLinux6.1.189 <= 6.1.*unaffected
LinuxLinux6.6.158 <= 6.6.*unaffected
LinuxLinux6.12.112 <= 6.12.*unaffected
LinuxLinux6.18.54 <= 6.18.*unaffected
LinuxLinux7.2.8 <= 7.2.*unaffected
LinuxLinux7.3-rc4 <= *unaffected

Weaknesses

References