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Report · GCP Kubernetes SecurityAbout CVE-2026-98432Published

GCP-2026-078

Source GCP Kubernetes Security

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Authoritative record:CVE-2026-98432· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical · fixed in e3f33b0a1d89d738e2b913dab519226eaf76e15b : patch Linux kernel as a priority.

Data as of 4 Nov 2026, 23:29 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Linux)CVSS 3.19.8
EPSS
0.7% chance of exploitation in 30 days – higher than 55% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in e3f33b0a1d89d738e2b913dab519226eaf76e15b, b3b027ef0cd322bfa839b9aaf5b27551eea54cf6, a47406c769f72c070386985488f1c4d057df86b2 +5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 4 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < e3f33b0a1d89d738e2b913dab519226eaf76e15b
Fixed in
  • e3f33b0a1d89d738e2b913dab519226eaf76e15b
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < b3b027ef0cd322bfa839b9aaf5b27551eea54cf6
Fixed in
  • b3b027ef0cd322bfa839b9aaf5b27551eea54cf6
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < a47406c769f72c070386985488f1c4d057df86b2
Fixed in
  • a47406c769f72c070386985488f1c4d057df86b2
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < 742f73df544e03744f2981c467d6542fe8172a2a
Fixed in
  • 742f73df544e03744f2981c467d6542fe8172a2a
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < 95a8c8fa9f27dce64c40c41c062de7728bf34ab5
Fixed in
  • 95a8c8fa9f27dce64c40c41c062de7728bf34ab5
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < 89b5b1eb7d633c33832b7ff2c02e19a144705036
Fixed in
  • 89b5b1eb7d633c33832b7ff2c02e19a144705036

AI-suggested

Upgrade your GKE cluster control plane and nodes running Container-Optimized OS to one of the following patched versions or later: 1.36.5-gke.1982000, 1.35.9-gke.1505000, 1.34.12-gke.1539000, 1.33.13-gke.2207000, or 1.32.13-gke.2906000. Patches for GKE 1.37 and Ubuntu node images are in progress. You may apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel to secure nodes until the patch becomes the default. Restrict network access to TCP listeners on nodes, Pods, and control plane IP endpoints to trusted sources using firewall rules and authorized networks to mitigate remote exploitation risk. Follow official Google Kubernetes Engine security bulletins for updates.

Description

A vulnerability (CVE-2026-98432) in the Linux kernel IPv4 TCP stack can cause a kernel panic or container escape, allowing root code execution on the node. It can be triggered locally by an unprivileged process in a container without special capabilities or remotely by a network attacker sending crafted TCP packets with IPv4 options to a TCP listener on nodes, Pods, or the cluster control plane. Clusters that restrict TCP listener access to trusted sources are not exposed to network attacks. The vulnerability affects GKE Standard and Autopilot clusters running Container-Optimized OS versions prior to specified patched releases. Patch versions are available for multiple GKE minor versions, with patches for GKE 1.37 and Ubuntu node images in progress.

References

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