VulnerabilityPublished 18 Oct 2026

CVE-2026-98853: Linux kernel · net: gso: limit recursive IP-in-IP segmentation

Source GCVE Database

Authoritative record:CVE-2026-98853· High

Not known to be exploited : upgrade to c949646c900e879afce47df1b607fa320eb63bf2 or 006c8b834aed8b02bd8fb9fb05e9e7ead37d1763 soon.

Data as of 26 Oct 2026, 12:55 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c949646c900e879afce47df1b607fa320eb63bf2, 006c8b834aed8b02bd8fb9fb05e9e7ead37d1763

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-3hxr-fh6w-v89j

What to do

Upgrade Linux kernel to c949646c900e879afce47df1b607fa320eb63bf2 or 006c8b834aed8b02bd8fb9fb05e9e7ead37d1763.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 3347c960295583eee3fd58e5c539fb1972fbc005, < c949646c900e879afce47df1b607fa320eb63bf2	Fixed in c949646c900e879afce47df1b607fa320eb63bf2
LinuxLinux	Affected ≥ 3347c960295583eee3fd58e5c539fb1972fbc005, < 006c8b834aed8b02bd8fb9fb05e9e7ead37d1763	Fixed in 006c8b834aed8b02bd8fb9fb05e9e7ead37d1763
LinuxLinux	Affected =3.13	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to limit recursive IP-in-IP segmentation calls using the IP_TUNNEL_RECURSION_LIMIT. Users should apply the official kernel updates that include this fix. Since this is a kernel-level vulnerability, upgrading to the patched kernel version is the recommended remediation.

Description

A vulnerability in the Linux kernel's IP-in-IP Generic Segmentation Offload (GSO) implementation allowed recursive segmentation calls that could exhaust the kernel stack. This was due to unbounded IPv4 and IPv6 IP-in-IP nesting in GSO handlers. The issue has been resolved by limiting recursion depth using the existing IP_TUNNEL_RECURSION_LIMIT, preventing excessive nested calls.

References

Community reviews

Loading reviews…