Skip to main content
Report · Zero Day InitiativeAbout CVE-2026-98797Published

ZDI-26-1002: Linux Kernel Net Scheduler Qdisc Improper Validation of Array Index Local Privilege Escalation Vulnerability

Source Zero Day Initiative

0
Compare
Authoritative record:CVE-2026-98797· High

Not known to be exploited · fixed in f99de42f5c6f8d088063817dad82c3334e87c570 : patch Linux kernel soon.

Data as of 13 Nov 2026, 22:36 UTC

Severity
High

Rated High by Zero Day Initiative · CVSS not yet scored by NVD

Patch
Available – fixed in f99de42f5c6f8d088063817dad82c3334e87c570, ea4d4b5dddb5121e64f56fd8e0720bd8b447b63d, c6ec35c8267c84c2094cb485db20c06384fc2bcc +1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 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 13 Nov 2026.

What to do

Upgrade Linux kernel to f99de42f5c6f8d088063817dad82c3334e87c570, ea4d4b5dddb5121e64f56fd8e0720bd8b447b63d, c6ec35c8267c84c2094cb485db20c06384fc2bcc or 2f581814e4e3ea6a5e98f49813dc4c68444a0c4a.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 2f1e85b1aee459b7d0fd981839042c6a38ffaf0c, < f99de42f5c6f8d088063817dad82c3334e87c570
Fixed in
  • f99de42f5c6f8d088063817dad82c3334e87c570
LinuxLinuxAffected
  • ≥ 2f1e85b1aee459b7d0fd981839042c6a38ffaf0c, < ea4d4b5dddb5121e64f56fd8e0720bd8b447b63d
Fixed in
  • ea4d4b5dddb5121e64f56fd8e0720bd8b447b63d
LinuxLinuxAffected
  • ≥ 2f1e85b1aee459b7d0fd981839042c6a38ffaf0c, < c6ec35c8267c84c2094cb485db20c06384fc2bcc
Fixed in
  • c6ec35c8267c84c2094cb485db20c06384fc2bcc
LinuxLinuxAffected
  • ≥ 2f1e85b1aee459b7d0fd981839042c6a38ffaf0c, < 2f581814e4e3ea6a5e98f49813dc4c68444a0c4a
Fixed in
  • 2f581814e4e3ea6a5e98f49813dc4c68444a0c4a
LinuxLinuxAffected
  • =5.19
Fixed in–

Description

A local privilege escalation vulnerability exists in the Linux Kernel Net Scheduler Qdisc due to improper validation of an array index. Exploitation requires prior ability to execute low-privileged code on the affected system. The vulnerability has a high severity rating assigned by ZDI and is tracked as CVE-2026-98797.

References

Community reviews

Loading reviews…