GHSA-8J4R-887V-CJJX
Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31In 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": [],
"aliases": [
"CVE-2026-98347"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-06T09:18:27Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/IPoIB: Avoid restoring OPER_UP after multicast flush\n\nipoib_ib_dev_flush_light() temporarily clears IPOIB_FLAG_OPER_UP to\nprevent multicast joins while ipoib_mcast_dev_flush() is running, and\nrestores the flag afterwards if it was previously set.\n\nThis restore races with ipoib_ib_dev_down(). If the interface is brought\ndown while the flush is in progress, ipoib_ib_dev_down() clears\nIPOIB_FLAG_OPER_UP, but the flush path may set it again after the device\nhas already gone down.\n\nSince commit 894021a75291 (\"IB/ipoib: Make the carrier_on_task race\naware\"), ipoib_mcast_carrier_on_task() relies on IPOIB_FLAG_OPER_UP\nbeing cleared to terminate its rtnl_trylock() retry loop. If the flag is\nleft set after shutdown, the workqueue retries forever, causing teardown\nto deadlock when ipoib_ndo_uninit() waits in destroy_workqueue() while\nholding RTNL.\n\nInstead of overloading IPOIB_FLAG_OPER_UP to block multicast joins\nduring a light flush, introduce a dedicated IPOIB_FLAG_MCAST_FLUSH flag.\nUse it together with IPOIB_FLAG_OPER_UP to determine whether multicast\njoins are allowed, avoiding the race with device shutdown.",
"id": "GHSA-8j4r-887v-cjjx",
"modified": "2026-10-06T09:31:36Z",
"published": "2026-10-06T09:31:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98347"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/188b334a6db36a8e0bfaaf59bc4020639a0f3aad"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1b11e4b55b41d9e69a8e8d07622614202e2eaca9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1ff3add37c329704ec46181b4ae4f00f9f16ce6f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/326f7d34bd7e64de535566b65c0533b640df5a81"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5ad925d45f28464a5e043c9620880bb6a030da89"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9a141d3dc869d18b2eab35e999f4790a9b84e40f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b72f38929f4b5aa83161fd3b22a7327207e51ec5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f973769fb7cb33ba0d4a64b7dcfee0cabaead938"
}
],
"schema_version": "1.4.0",
"severity": []
}
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