CVE-2026-98347: IB/IPoIB: Avoid restoring OPER_UP after multicast flush
Vulnerability summary
CVE-2026-98347 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.2% of scored vulnerabilities.
No CVSS vector published; no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 11 · Related 11Timeline
- 06-10-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
Risk metrics not yet published.
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: not stated in public data.
Ubuntu169 products
- linuxAll versions (No fix recorded)
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.113-1 | < 7.2.8-1
- linux-6.12< 6.12.113-1~deb12u1
Linux1 product
- linux≥ 344bacca8cd811809fc33a249f2738ab757d327f, < f973769fb7cb33ba0d4a64b7dcfee0cabaead938 | ≥ 344bacca8cd811809fc33a249f2738ab757d327f, < b72f38929f4b5aa83161fd3b22a7327207e51ec5 | ≥ 344bacca8cd811809fc33a249f2738ab757d327f, < 1b11e4b55b41d9e69a8e8d07622614202e2eaca9 | ≥ 344bacca8cd811809fc33a249f2738ab757d327f, < 326f7d34bd7e64de535566b65c0533b640df5a81 | ≥ 344bacca8cd811809fc33a249f2738ab757d327f, < 5ad925d45f28464a5e043c9620880bb6a030da89 | ≥ 344bacca8cd811809fc33a249f2738ab757d327f, < 188b334a6db36a8e0bfaaf59bc4020639a0f3aad | ≥ 344bacca8cd811809fc33a249f2738ab757d327f, < 1ff3add37c329704ec46181b4ae4f00f9f16ce6f | ≥ 344bacca8cd811809fc33a249f2738ab757d327f, < 9a141d3dc869d18b2eab35e999f4790a9b84e40f | a289c65ca49d2680a3d797e633e57a45573d1df2 | b81459c78935e4579a577b2366c5f8878d3c7fee | 8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5 | dfe809702a11bd7fb91c882fb55620e39ce22109 | 87160fb51bc343793cc8f5f031a87f1a35aecb82 | 749fd55dd210f9676f0d445a6efaaa3bec65174a | ≥ 3.2.84, < 3.3 | ≥ 3.10.105, < 3.11 | ≥ 3.12.65, < 3.13 | ≥ 3.16.39, < 3.17 | ≥ 4.4.24, < 4.5 | ≥ 4.7.7, < 4.8 | 4.8
3 vendors · 172 products
