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CVE-2026-18477

Tar: tar: toctou in incremental dumpdir 'x' rename handling allows restore path escape PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Red Hat / Red Hat Enterprise Linux 10unaffected 2:1.35-13.el10_2 before *
Red Hat / Red Hat Enterprise Linux 8unaffected 2:1.30-13.el8_10 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 2:1.34-13.el9_8 before *
Red Hat / Red Hat Discovery 2unaffected 1788205779 before *
Red Hat / Red Hat Hardened Imagesunaffected 1.35-9.1.hum1 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1788880445 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1788880464 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1788880456 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1788765051 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1788880581 before *
Red Hat / Red Hat Enterprise Linux 6unknown
Red Hat / Red Hat Enterprise Linux 7unknown
Red Hat / Red Hat Hardened Imagesunaffected
Red Hat / Red Hat Hardened Imagesunaffected
Red Hat / Red Hat Hardened Imagesunaffected
Red Hat / Red Hat Hardened Imagesunaffected
Red Hat / Red Hat Hardened Imagesunaffected
Red Hat / Red Hat Hardened Imagesunaffected
Red Hat / Red Hat Hardened Imagesunaffected
Red Hat / Red Hat Hardened Imagesunaffected
Red Hat / Red Hat Hardened Imagesunaffected
Red Hat / Red Hat Hardened Imagesunaffected
Red Hat / Red Hat OpenShift Container Platform 4affected
Red Hat / Red Hat OpenShift Container Platform 4affected

CWE

CWE-367

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.