CVE-2026-86805Hinoki check available

Privilege escalation via $ORIGIN path race

Published Sep 22, 2026 · Updated Sep 22, 2026

TOCTOU race in the glibc dynamic loader 2.14 through 2.44 allows local users to execute code with elevated program privileges. During $ORIGIN expansion for an AT_SECURE program's DT_RPATH, ld.so validates a normalized path but opens the raw path, enabling a raced symlink to redirect shared-object loading. Exploitation requires a setuid or setgid binary with an $ORIGIN-plus-.. RPATH, hard-link creation, disabled fs.protected_hardlinks, and a won path-component race.

CVSS severityUnavailable
Unscored
EPSS probability0.10%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

TOCTOU race in the glibc dynamic loader 2.14 through 2.44 allows local users to execute code with elevated program privileges. During $ORIGIN expansion for an AT_SECURE program's DT_RPATH, ld.so validates a normalized path but opens the raw path, enabling a raced symlink to redirect shared-object loading. Exploitation requires a setuid or setgid binary with an $ORIGIN-plus-.. RPATH, hard-link creation, disabled fs.protected_hardlinks, and a won path-component race.

The record

CVE
CVE-2026-86805
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
The elfutils project
Product
glibc
Classifications
T1574.006, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 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=2.14 <2.45

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The elfutils project · glibcversion=2.14 <2.45

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1574.006Dynamic Linker Hijacking
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

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