Unknown

CVE-2026-98347 — 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.

Published Oct 6, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.18%

ahead of 7% of scored CVEs · Oct 14, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	version 8a9d8dc9ce83a90bfbbe69181acc4cf1beff46f5version 4.8≥ 4.7.7 and < 4.8≥ 4.4.24 and < 4.5≥ 3.16.39 and < 3.17≥ 3.12.65 and < 3.13≥ 3.10.105 and < 3.11≥ 3.2.84 and < 3.3 and 13 more version 749fd55dd210f9676f0d445a6efaaa3bec65174aversion 87160fb51bc343793cc8f5f031a87f1a35aecb82version dfe809702a11bd7fb91c882fb55620e39ce22109≥ 344bacca8cd811809fc33a249f2738ab757d327f and < f973769fb7cb33ba0d4a64b7dcfee0cabaead938version b81459c78935e4579a577b2366c5f8878d3c7feeversion a289c65ca49d2680a3d797e633e57a45573d1df2≥ 344bacca8cd811809fc33a249f2738ab757d327f and < 9a141d3dc869d18b2eab35e999f4790a9b84e40f≥ 344bacca8cd811809fc33a249f2738ab757d327f and < 1ff3add37c329704ec46181b4ae4f00f9f16ce6f≥ 344bacca8cd811809fc33a249f2738ab757d327f and < 188b334a6db36a8e0bfaaf59bc4020639a0f3aad≥ 344bacca8cd811809fc33a249f2738ab757d327f and < 5ad925d45f28464a5e043c9620880bb6a030da89≥ 344bacca8cd811809fc33a249f2738ab757d327f and < 326f7d34bd7e64de535566b65c0533b640df5a81≥ 344bacca8cd811809fc33a249f2738ab757d327f and < 1b11e4b55b41d9e69a8e8d07622614202e2eaca9≥ 344bacca8cd811809fc33a249f2738ab757d327f and < b72f38929f4b5aa83161fd3b22a7327207e51ec5	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.18%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 13, 2026
Affected products added · linux/linux
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
Oct 6, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

8 on the record

git.kernel.org/stable/c/9a141d3dc869d18b2eab35e999f4790a9b84e40f
NIST National Vulnerability Database
git.kernel.org/stable/c/b72f38929f4b5aa83161fd3b22a7327207e51ec5
NIST National Vulnerability Database
git.kernel.org/stable/c/1ff3add37c329704ec46181b4ae4f00f9f16ce6f
NIST National Vulnerability Database
git.kernel.org/stable/c/188b334a6db36a8e0bfaaf59bc4020639a0f3aad
NIST National Vulnerability Database
git.kernel.org/stable/c/326f7d34bd7e64de535566b65c0533b640df5a81
NIST National Vulnerability Database
git.kernel.org/stable/c/1b11e4b55b41d9e69a8e8d07622614202e2eaca9
NIST National Vulnerability Database
git.kernel.org/stable/c/5ad925d45f28464a5e043c9620880bb6a030da89
NIST National Vulnerability Database
git.kernel.org/stable/c/f973769fb7cb33ba0d4a64b7dcfee0cabaead938
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 9h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 9h
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-98347 is "IB/IPoIB: Avoid restoring OPER_UP after multicast flush", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.18% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.