CVE-2026-55266

Local privilege escalation via unbounded qsort recursion

Published Oct 5, 2026 · Updated Oct 5, 2026

Out-of-bounds write in Google Android 14, 15, 16, 16-qpr2, and 17 allows local users to escalate privileges via libufdt sorting. The qsort routine in libufdt_sysdeps_vendor.c recurses into the left partition regardless of its size, so adversarial partitions can exhaust stack space. The vendor implementation is used in bootloader integration; the public record does not identify a reachable entry point or the privilege level obtained.

CVSS severityUnavailable
Unscored
EPSS probability0.07%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Google Android 14, 15, 16, 16-qpr2, and 17 allows local users to escalate privileges via libufdt sorting. The qsort routine in libufdt_sysdeps_vendor.c recurses into the left partition regardless of its size, so adversarial partitions can exhaust stack space. The vendor implementation is used in bootloader integration; the public record does not identify a reachable entry point or the privilege level obtained.

The record

CVE
CVE-2026-55266
Published
Oct 5, 2026
Updated
Oct 5, 2026
Vendor
WebM Project
Product
Android
Classifications
T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=14
  2. Affected versionversion=15
  3. Affected versionversion=16
  4. Affected versionversion=16-qpr2
  5. Affected versionversion=17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

WebM Project · Androidversion=14; version=15; version=16; version=16-qpr2; version=17

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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