CVE-2026-98347 is a vulnerability in Linux Kernel
Published on October 6, 2026
IB/IPoIB: Avoid restoring OPER_UP after multicast flush
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.
Products Associated with CVE-2026-98347
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Affected Versions
Linux:- Version 344bacca8cd811809fc33a249f2738ab757d327f and below f973769fb7cb33ba0d4a64b7dcfee0cabaead938 is affected.
- Version 344bacca8cd811809fc33a249f2738ab757d327f and below b72f38929f4b5aa83161fd3b22a7327207e51ec5 is affected.
- Version 344bacca8cd811809fc33a249f2738ab757d327f and below 1b11e4b55b41d9e69a8e8d07622614202e2eaca9 is affected.
- Version 344bacca8cd811809fc33a249f2738ab757d327f and below 326f7d34bd7e64de535566b65c0533b640df5a81 is affected.
- Version 344bacca8cd811809fc33a249f2738ab757d327f and below 5ad925d45f28464a5e043c9620880bb6a030da89 is affected.
- Version 344bacca8cd811809fc33a249f2738ab757d327f and below 188b334a6db36a8e0bfaaf59bc4020639a0f3aad is affected.
- Version 344bacca8cd811809fc33a249f2738ab757d327f and below 1ff3add37c329704ec46181b4ae4f00f9f16ce6f is affected.
- Version 344bacca8cd811809fc33a249f2738ab757d327f and below 9a141d3dc869d18b2eab35e999f4790a9b84e40f is affected.
- Version a289c65ca49d2680a3d797e633e57a45573d1df2 is affected.
- Version b81459c78935e4579a577b2366c5f8878d3c7fee is affected.
- Version 8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5 is affected.
- Version dfe809702a11bd7fb91c882fb55620e39ce22109 is affected.
- Version 87160fb51bc343793cc8f5f031a87f1a35aecb82 is affected.
- Version 749fd55dd210f9676f0d445a6efaaa3bec65174a is affected.
- Version 3.2.84 and below 3.3 is affected.
- Version 3.10.105 and below 3.11 is affected.
- Version 3.12.65 and below 3.13 is affected.
- Version 3.16.39 and below 3.17 is affected.
- Version 4.4.24 and below 4.5 is affected.
- Version 4.7.7 and below 4.8 is affected.
- Version 4.8 is affected.
- Before 4.8 is unaffected.
- Version 5.10.271, <= 5.10.* is unaffected.
- Version 5.15.222, <= 5.15.* is unaffected.
- Version 6.1.189, <= 6.1.* is unaffected.
- Version 6.6.158, <= 6.6.* is unaffected.
- Version 6.12.112, <= 6.12.* is unaffected.
- Version 6.18.54, <= 6.18.* is unaffected.
- Version 7.2.8, <= 7.2.* is unaffected.
- Version 7.3-rc4, <= * is unaffected.