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CVE-2026-98347

IB/IPoIB: Avoid restoring OPER_UP after multicast flush

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 3.3, 3.11, 3.13, 3.17, 4.5, and 8 more
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 344bacca8cd811809fc33a249f2738ab757d327f · fixed in f973769fb7cb33ba0d4a64b7dcfee0cabaead938; From 344bacca8cd811809fc33a249f2738ab757d327f · fixed in b72f38929f4b5aa83161fd3b22a7327207e51ec5; From 344bacca8cd811809fc33a249f2738ab757d327f · fixed in 1b11e4b55b41d9e69a8e8d07622614202e2eaca9; From 344bacca8cd811809fc33a249f2738ab757d327f · fixed in 326f7d34bd7e64de535566b65c0533b640df5a81; From 344bacca8cd811809fc33a249f2738ab757d327f · fixed in 5ad925d45f28464a5e043c9620880bb6a030da89; From 344bacca8cd811809fc33a249f2738ab757d327f · fixed in 188b334a6db36a8e0bfaaf59bc4020639a0f3aad; From 344bacca8cd811809fc33a249f2738ab757d327f · fixed in 1ff3add37c329704ec46181b4ae4f00f9f16ce6f; From 344bacca8cd811809fc33a249f2738ab757d327f · fixed in 9a141d3dc869d18b2eab35e999f4790a9b84e40f; From 3.2.84 · fixed in 3.3; From 3.10.105 · fixed in 3.11; From 3.12.65 · fixed in 3.13; From 3.16.39 · fixed in 3.17; From 4.4.24 · fixed in 4.5; From 4.7.7 · fixed in 4.8

  • Linux Linux

    4.8

  • KernelLinux

    From 4.8.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 8

git.kernel.org