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Time-of-check Time-of-use (TOCTOU) The advisory has been revoked - it doesn't affect any version of package rhcos  (opens in a new tab)

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EPSS
0.08% (1st percentile)

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  • Snyk IDSNYK-RHEL7-RHCOS-18548407
  • published5 Aug 2026
  • disclosed31 Jul 2026
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Introduced: 31 Jul 2026

CVE-2026-18477  (opens in a new tab)
CWE-367  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:7.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rhcos package and not the rhcos package as distributed by RHEL.

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.