VulnerabilityPublished 18 Oct 2026

CVE-2026-98598: Linux kernel · ipv6: Prevent rt6_insert_exception() for dying fib6_info.

Source GCVE Database

Authoritative record:CVE-2026-98598· Medium

Not known to be exploited · fixed in e03e77071e75ce726d877f0a4349a28b6e1f487a : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e03e77071e75ce726d877f0a4349a28b6e1f487a, 649ffc76ed5483b2caf35ed90d3787538efc4e53, 0346ec2f080b40d95ed05b853bb9226289e75212

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-3wx3-9xwg-38ff

What to do

Upgrade Linux kernel to e03e77071e75ce726d877f0a4349a28b6e1f487a, 649ffc76ed5483b2caf35ed90d3787538efc4e53 or 0346ec2f080b40d95ed05b853bb9226289e75212.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ cc5c073a693fa6ed7a207b0436114f68cce72434, < e03e77071e75ce726d877f0a4349a28b6e1f487a	Fixed in e03e77071e75ce726d877f0a4349a28b6e1f487a
LinuxLinux	Affected ≥ cc5c073a693fa6ed7a207b0436114f68cce72434, < 649ffc76ed5483b2caf35ed90d3787538efc4e53	Fixed in 649ffc76ed5483b2caf35ed90d3787538efc4e53
LinuxLinux	Affected ≥ cc5c073a693fa6ed7a207b0436114f68cce72434, < 0346ec2f080b40d95ed05b853bb9226289e75212	Fixed in 0346ec2f080b40d95ed05b853bb9226289e75212
LinuxLinux	Affected =5.3	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to prevent insertion of new exceptions for fib6_info structures that are being destroyed. Users should update to the fixed kernel version once available. No other mitigation is indicated by the vendor advisory.

Description

A vulnerability in the Linux kernel's IPv6 routing code allowed a reference cycle to form between fib6_info structures and exception routes during route removal, causing resource leaks and stalling network device unregistration. This was due to improper handling of exception insertion for dying fib6_info objects. The issue has been resolved by adding a check to prevent new exceptions from being inserted during fib6_info destruction.

References

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