Description
Directory traversal vulnerability in CIFS in Linux 2.6.16 and earlier allows local users to escape chroot restrictions for an SMB-mounted filesystem via "..\\" sequences, a similar vulnerability to CVE-2006-1864.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 3.1 | kernel-source-2.6.8 | 2.6.8-16sarge3 | DSA-1103 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | kernel +10 | 2.6.9-55.EL | RHBA-2007:0304 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Linux Kernel 2.6.x - CIFS CHRoot Security Restriction Bypass EDB-27769 · local · Apr 28, 2006 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- RHBA-2007:0304 Red Hat Bug Fix Advisory: Updated kernel packages available for Red Hat Enterprise Linux 4 Update 5 Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1103 kernel-source-2.6.8 - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- ADV-2006-2554 vdb-entry
- 17742 vdb-entry
- MDKSA-2006:150 vendor-advisory
- oval:org.mitre.oval:def:10383 vdb-entry signature
- ADV-2006-1542 vdb-entry
- https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=189434
- MDKSA-2006:151 vendor-advisory
- 21614 third-party-advisory
- SUSE-SA:2006:028 vendor-advisory
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.11
- DSA-1103 vendor-advisory
- RHBA-2007-0304 vendor-advisory
- 2006-0024 vendor-advisory
- http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=296034f7de8bdf111984ce1630ac598a9c94a253
- 20398 third-party-advisory
- kernel-cifs-directory-traversal(26141) vdb-entry
- 19868 third-party-advisory
- 25068 vdb-entry
- 20914 third-party-advisory