Description
Directory traversal vulnerability in smbfs 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-2006-1863.
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-2.4.27 | 2.4.27-10sarge3 | DSA-1097-1 |
| 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 +8 | 2.6.9-34.0.1.EL | RHSA-2006:0493 |
| RHEL 3 | kernel +8 | 2.4.21-47.0.1.EL | RHSA-2006:0710 |
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 - SMBFS CHRoot Security Restriction Bypass EDB-27766 · 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 4
- RHSA-2006:0710 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2006:0493 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1097-1 kernel-source-2.4.27 - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1103 kernel-source-2.6.8 - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://support.avaya.com/elmodocs2/security/ASA-2006-161.htm
- RHSA-2006:0493 vendor-advisory
- oval:org.mitre.oval:def:11327 vdb-entry signature
- 19869 third-party-advisory
- ADV-2006-4502 vdb-entry
- ADV-2006-2554 vdb-entry
- RHSA-2006:0579 vendor-advisory
- 20716 third-party-advisory
- 22875 third-party-advisory
- 25067 vdb-entry
- 21476 third-party-advisory
- 21745 third-party-advisory
- MDKSA-2006:150 vendor-advisory
- http://www.vmware.com/download/esx/esx-202-200610-patch.html
- USN-302-1 vendor-advisory
- MDKSA-2006:151 vendor-advisory
- 20061113 VMSA-2006-0008 - VMware ESX Server 2.0.2 Upgrade Patch 2 mailing-list
- 21614 third-party-advisory
- https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=189435
- 21035 third-party-advisory
- http://www.vmware.com/download/esx/esx-213-200610-patch.html
- DSA-1097 vendor-advisory
- SUSE-SA:2006:028 vendor-advisory
- 17735 vdb-entry
- 2006-0026 vendor-advisory
- RHSA-2006:0580 vendor-advisory
- DSA-1103 vendor-advisory
- 23064 third-party-advisory
- http://www.vmware.com/download/esx/esx-254-200610-patch.html
- http://support.avaya.com/elmodocs2/security/ASA-2006-254.htm
- 22497 third-party-advisory
- 20061113 VMSA-2006-0006 - VMware ESX Server 2.5.3 Upgrade Patch 4 mailing-list
- RHSA-2006:0710 vendor-advisory
- 20237 third-party-advisory
- 20398 third-party-advisory
- 20061113 VMSA-2006-0007 - VMware ESX Server 2.1.3 Upgrade Patch 2 mailing-list
- kernel-smbfs-directory-traversal(26137) vdb-entry
- 20671 third-party-advisory
- 20061113 VMSA-2006-0005 - VMware ESX Server 2.5.4 Upgrade Patch 1 mailing-list
- 20914 third-party-advisory