VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98805: Linux kernel · tipc: prevent GCM nonce reuse on peer key changes

Source GCVE Database

Authoritative record:CVE-2026-98805

Not known to be exploited · fixed in f74f100e49588c1dbdc6ab3ba9e2c67b36d015d0 : patch Linux kernel soon.

Data as of 26 Oct 2026, 14:05 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f74f100e49588c1dbdc6ab3ba9e2c67b36d015d0, a85a3dce4b6c73ddaa1e9725b906249744bf7cf2, 512ccd3d0e91e791fb37442aa0a2599aca19783d +2

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-c3cw-v3mg-q5gm

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ fc1b6d6de2208774efd2a20bf0daddb02d18b1e0, < f74f100e49588c1dbdc6ab3ba9e2c67b36d015d0	Fixed in f74f100e49588c1dbdc6ab3ba9e2c67b36d015d0
LinuxLinux	Affected ≥ fc1b6d6de2208774efd2a20bf0daddb02d18b1e0, < a85a3dce4b6c73ddaa1e9725b906249744bf7cf2	Fixed in a85a3dce4b6c73ddaa1e9725b906249744bf7cf2
LinuxLinux	Affected ≥ fc1b6d6de2208774efd2a20bf0daddb02d18b1e0, < 512ccd3d0e91e791fb37442aa0a2599aca19783d	Fixed in 512ccd3d0e91e791fb37442aa0a2599aca19783d
LinuxLinux	Affected ≥ fc1b6d6de2208774efd2a20bf0daddb02d18b1e0, < 60e0c2aeaa605ff19ca4e65126a35643d4d7ee1c	Fixed in 60e0c2aeaa605ff19ca4e65126a35643d4d7ee1c
LinuxLinux	Affected ≥ fc1b6d6de2208774efd2a20bf0daddb02d18b1e0, < 5c8ce13c792e28d56f9ec3cd6728d8225bc0e3a2	Fixed in 5c8ce13c792e28d56f9ec3cd6728d8225bc0e3a2
LinuxLinux	Affected =5.5	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to prevent nonce reuse by using a shared atomic counter for nonce generation that persists across peer key changes. Users should apply the updated Linux kernel version containing this fix. Since this is a kernel-level vulnerability, upgrading to the patched kernel version is the recommended remediation. No additional mitigations are indicated.

Description

A vulnerability in the Linux kernel's TIPC protocol allowed reuse of AES-GCM nonces when peer keys changed, breaking confidentiality and enabling trivial forgeries. The issue was fixed by changing nonce generation to use a shared atomic counter that persists across key changes, preventing nonce reuse. This fix maintains compatibility with existing receivers and prevents key revocation except in rare counter wrap scenarios.

References

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