Description
The Linux kernel before 2.6.23-rc1 checks the wrong global variable for the CIFS sec mount option, which might allow remote attackers to spoof CIFS network traffic that the client configured for security signatures, as demonstrated by lack of signing despite sec=ntlmv2i in a SetupAndX request.
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 4.0 | linux-2.6 | 2.6.18.dfsg.1-13etch2 | DSA-1363-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | kernel +10 | 2.6.18-8.1.10.el5 | RHSA-2007:0705 |
| RHEL 4 | kernel +10 | 2.6.9-55.0.12.EL | RHSA-2007:0939 |
Advisories 3
- RHSA-2007:0705 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2007:0939 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1363-1 linux-2.6 Debian Security (DSA / DLA) · Mar 9, 2026
References
- oval:org.mitre.oval:def:9670 vdb-entry signature
- 27747 third-party-advisory
- 28806 third-party-advisory
- DSA-1363 vendor-advisory
- http://kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.23-rc1
- RHSA-2007:0939 vendor-advisory
- USN-510-1 vendor-advisory
- 25244 vdb-entry
- http://support.avaya.com/elmodocs2/security/ASA-2007-474.htm
- 26647 third-party-advisory
- 27912 third-party-advisory
- 26760 third-party-advisory
- RHSA-2007:0705 vendor-advisory
- 26366 third-party-advisory
- SUSE-SA:2007:064 vendor-advisory
- SUSE-SA:2008:006 vendor-advisory
- http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=246595
- 27436 third-party-advisory