Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 344bacca8cd811809fc33a249f2738ab757d327f before f973769fb7cb33ba0d4a64b7dcfee0cabaead938; affected 344bacca8cd811809fc33a249f2738ab757d327f before b72f38929f4b5aa83161fd3b22a7327207e51ec5; affected 344bacca8cd811809fc33a249f2738ab757d327f before 1b11e4b55b41d9e69a8e8d07622614202e2eaca9; affected 344bacca8cd811809fc33a249f2738ab757d327f before 326f7d34bd7e64de535566b65c0533b640df5a81; affected 344bacca8cd811809fc33a249f2738ab757d327f before 5ad925d45f28464a5e043c9620880bb6a030da89; affected 344bacca8cd811809fc33a249f2738ab757d327f before 188b334a6db36a8e0bfaaf59bc4020639a0f3aad; affected 344bacca8cd811809fc33a249f2738ab757d327f before 1ff3add37c329704ec46181b4ae4f00f9f16ce6f; affected 344bacca8cd811809fc33a249f2738ab757d327f before 9a141d3dc869d18b2eab35e999f4790a9b84e40f; affected a289c65ca49d2680a3d797e633e57a45573d1df2; affected b81459c78935e4579a577b2366c5f8878d3c7fee; affected 8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5; affected dfe809702a11bd7fb91c882fb55620e39ce22109; affected 87160fb51bc343793cc8f5f031a87f1a35aecb82; affected 749fd55dd210f9676f0d445a6efaaa3bec65174a; affected 3.2.84 before 3.3; affected 3.10.105 before 3.11; affected 3.12.65 before 3.13; affected 3.16.39 before 3.17; affected 4.4.24 before 4.5; affected 4.7.7 before 4.8 |
| Linux / Linux | affected 4.8; unaffected 0 before 4.8; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.112 through 6.12.*; unaffected 6.18.54 through 6.18.*; unaffected 7.2.8 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/f973769fb7cb33ba0d4a64b7dcfee0cabaead938
- https://git.kernel.org/stable/c/b72f38929f4b5aa83161fd3b22a7327207e51ec5
- https://git.kernel.org/stable/c/1b11e4b55b41d9e69a8e8d07622614202e2eaca9
- https://git.kernel.org/stable/c/326f7d34bd7e64de535566b65c0533b640df5a81
- https://git.kernel.org/stable/c/5ad925d45f28464a5e043c9620880bb6a030da89
- https://git.kernel.org/stable/c/188b334a6db36a8e0bfaaf59bc4020639a0f3aad
- https://git.kernel.org/stable/c/1ff3add37c329704ec46181b4ae4f00f9f16ce6f
- https://git.kernel.org/stable/c/9a141d3dc869d18b2eab35e999f4790a9b84e40f