VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98852: Linux kernel · net: extend IPv6 exthdr detection of tunneled packets

Source GCVE Database

Authoritative record:CVE-2026-98852

Not known to be exploited · fixed in fdbd83c2d929ec968b37d2f75149a79440e328ff : 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 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fdbd83c2d929ec968b37d2f75149a79440e328ff, cabacdf98e09eb74599c4d97d7bd7fd659598fb7, aa480f05aed7a9eee87d4a6fc90647fe9679c670 +7

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-jqxw-mh4h-wm57

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.6.134 <6.6.160 >=6.12.81 <6.12.113 >=6.18.22 <6.18.56 >=6.1.168 <6.2 >=6.19.12 <6.20	Fixed in fdbd83c2d929ec968b37d2f75149a79440e328ff cabacdf98e09eb74599c4d97d7bd7fd659598fb7 aa480f05aed7a9eee87d4a6fc90647fe9679c670 44ba9dc568c878b699d05e7cf699572dc9df4b59 6.20 6.18.56 6.12.113 6.6.160 6.2 5f0764cb1c81a9712bce605d38efe6d844a70b29
LinuxLinux	Affected =7.0	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel as described in commit c4336a07eb6b. Users should update their Linux kernel to a version that includes this commit to resolve the vulnerability. Since this is a kernel-level fix, applying the official kernel update from the vendor or distribution is the recommended remediation. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's handling of IPv6 tunneled packets was resolved by improving detection of IPv6 extension headers in tunneled traffic. The issue involved incorrect handling of outer and inner IPv6 headers in various tunneling scenarios, leading to false positives and unsafe header dereferencing. The fix ensures proper parsing of outer and inner IPv6 extension headers and safer header access methods.

References

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