VulnerabilityPublished 18 Oct 2026

CVE-2026-98624: Linux kernel · netfilter: nfnetlink_queue: hold nfnl mutex in event notifier

Source GCVE Database

Authoritative record:CVE-2026-98624· Medium

Not known to be exploited · fixed in d559e06a5ab7c064100aafd5c826eadd0f1c6216 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in d559e06a5ab7c064100aafd5c826eadd0f1c6216, 597320337c3da06c92a9e95cfc755da66fedc476, 9461613afc59acef44a0071b0dd5075f6e993ffe +5

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-6phv-j3wg-rfjh

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb, < d559e06a5ab7c064100aafd5c826eadd0f1c6216	Fixed in d559e06a5ab7c064100aafd5c826eadd0f1c6216
LinuxLinux	Affected ≥ 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb, < 597320337c3da06c92a9e95cfc755da66fedc476	Fixed in 597320337c3da06c92a9e95cfc755da66fedc476
LinuxLinux	Affected ≥ 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb, < 9461613afc59acef44a0071b0dd5075f6e993ffe	Fixed in 9461613afc59acef44a0071b0dd5075f6e993ffe
LinuxLinux	Affected ≥ 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb, < 46432f2e76f7c385d82506304a2928e7d293289f	Fixed in 46432f2e76f7c385d82506304a2928e7d293289f
LinuxLinux	Affected ≥ 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb, < 8137a39e08e838ced234044384740ceeb99ed388	Fixed in 8137a39e08e838ced234044384740ceeb99ed388
LinuxLinux	Affected ≥ 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb, < 07a3ec8fdc5a1267c00cd6fd1cf8bbb5cda913c1	Fixed in 07a3ec8fdc5a1267c00cd6fd1cf8bbb5cda913c1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented that serializes the release notifier and config netlink function by holding the nfnl mutex in the event notifier. Users should apply the official Linux kernel update that includes this fix. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor or Linux kernel advisory for the exact patch availability and remediation instructions.

Description

A concurrency vulnerability in the Linux kernel's netfilter nfnetlink_queue subsystem has been resolved. The issue involved improper serialization between the release notifier and the config netlink function, allowing concurrent threads to cause a general protection fault (kernel crash) due to race conditions during socket close and unbind operations. The fix enforces serialization to prevent parallel UNBIND and URELEASE events, addressing the root cause of the crash.

References

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