Skip to content
CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-98347

IB/IPoIB: Avoid restoring OPER_UP after multicast flush

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 344bacca8cd811809fc33a249f2738ab757d327f to < f973769fb7cb33ba0d4a64b7dcfee0cabaead938affected
  • 344bacca8cd811809fc33a249f2738ab757d327f to < b72f38929f4b5aa83161fd3b22a7327207e51ec5affected
  • 344bacca8cd811809fc33a249f2738ab757d327f to < 1b11e4b55b41d9e69a8e8d07622614202e2eaca9affected
  • 344bacca8cd811809fc33a249f2738ab757d327f to < 326f7d34bd7e64de535566b65c0533b640df5a81affected
  • 344bacca8cd811809fc33a249f2738ab757d327f to < 5ad925d45f28464a5e043c9620880bb6a030da89affected
  • 344bacca8cd811809fc33a249f2738ab757d327f to < 188b334a6db36a8e0bfaaf59bc4020639a0f3aadaffected
  • 344bacca8cd811809fc33a249f2738ab757d327f to < 1ff3add37c329704ec46181b4ae4f00f9f16ce6faffected
  • 344bacca8cd811809fc33a249f2738ab757d327f to < 9a141d3dc869d18b2eab35e999f4790a9b84e40faffected
  • a289c65ca49d2680a3d797e633e57a45573d1df2affected
  • b81459c78935e4579a577b2366c5f8878d3c7feeaffected
  • 8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5affected
  • dfe809702a11bd7fb91c882fb55620e39ce22109affected
  • 87160fb51bc343793cc8f5f031a87f1a35aecb82affected
  • 749fd55dd210f9676f0d445a6efaaa3bec65174aaffected
  • 3.2.84 to < 3.3affected
  • 3.10.105 to < 3.11affected
  • 3.12.65 to < 3.13affected
  • 3.16.39 to < 3.17affected
  • 4.4.24 to < 4.5affected
  • 4.7.7 to < 4.8affected

Linux Linux

Default version status: affected

  • 4.8affected
  • 0 to < 4.8unaffected
  • 5.10.271 to ≤ 5.10.*unaffected
  • 5.15.222 to ≤ 5.15.*unaffected
  • 6.1.189 to ≤ 6.1.*unaffected
  • 6.6.158 to ≤ 6.6.*unaffected
  • 6.12.112 to ≤ 6.12.*unaffected
  • 6.18.54 to ≤ 6.18.*unaffected
  • 7.2.8 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References