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TI-2026-27490 Aliases CVE-2026-35352GHSA-9gh9-hwpr-rvqq

uutils coreutils mkfifo Privilege Escalation via TOCTOU Race Condition

Priority LOW 32CWE-367Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

A Time-of-Check to Time-of-Use (TOCTOU) race condition exists in the mkfifo utility of uutils coreutils. The utility creates a FIFO and then performs a path-based chmod to set permissions. A local attacker with write access to the parent directory can swap the newly created FIFO for a symbolic link between these two operations. This redirects the chmod call to an arbitrary file, potentially enabling privilege escalation if the utility is run with elevated privileges.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00147 3rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Uutilscoreutils——No fix listedCNA
—coreutils (crates.io)up to 0.8.0—No fix listedGHSA-9gh9-hwpr-rvqq
  • coreutils VendorUutils Affected — Fixed in — No fix listed CNA
  • coreutils (crates.io) Vendor— Affected up to 0.8.0 Fixed in — No fix listed GHSA-9gh9-hwpr-rvqq

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:uutils:coreutils:-:*:*:*:*:rust:*:*not specified by NVDVulnerableUutils
  • cpe:2.3:a:uutils:coreutils:-:*:*:*:*:rust:*:* Versions not specified by NVD Vulnerable ·Uutils

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-35352
  2. 2026-10-03 Alias added: GHSA-9gh9-hwpr-rvqq

References

Exploit 1

Advisory 1

Other 4

  • TI-2026-27506 uutils coreutils chroot Local Privilege Escalation and chroot Escape in via Name Service Switch (NSS) Injection CVSS 3.1HIGH 7.2
  • TI-2026-27498 uutils coreutils touch Arbitrary File Truncation via TOCTOU Race Condition CVSS 3.1MEDIUM 6.3
  • TI-2026-27488 uutils coreutils cp Unexpected Privileged Executable Creation with -p CVSS 3.1MEDIUM 6.6
  • TI-2026-27502 uutils coreutils mv Arbitrary File Overwrite via Cross-Device TOCTOU Race Condition CVSS 3.1MEDIUM 6.3
  • TI-2026-27493 uutils coreutils install Arbitrary File Overwrite via Symlink TOCTOU Race CVSS 3.1MEDIUM 6.3
  • TI-2026-27511 uutils coreutils ln Local Denial of Service via Improper Handling of Non-UTF-8 Filenames CVSS 3.1MEDIUM 5.5
See all 43 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences