Description
The CIFS filesystem in the Linux kernel before 2.6.22, when Unix extension support is enabled, does not honor the umask of a process, which allows local users to gain privileges.
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 | fai-kernels | 1.17+etch.13etch3 | DSA-1378-2, DSA-1378-1 |
| Debian 4.0 | linux-2.6 | 2.6.18.dfsg.1-13etch3 | DSA-1378-2, DSA-1378-1 |
| Debian 4.0 | user-mode-linux | 2.6.18-1um-2etch.13etch3 | DSA-1378-2, DSA-1378-1 |
| Debian 3.1 | fai-kernels | 1.9.1sarge8 | DSA-1504-1 |
| Debian 3.1 | kernel-image-2.6.8-hppa | 2.6.8-7sarge1 | DSA-1504-1 |
| Debian 3.1 | kernel-image-2.6.8-ia64 | 2.6.8-15sarge1 | DSA-1504-1 |
| Debian 3.1 | kernel-image-2.6.8-m68k | 2.6.8-5sarge1 | DSA-1504-1 |
| Debian 3.1 | kernel-image-2.6.8-s390 | 2.6.8-6sarge1 | DSA-1504-1 |
| Debian 3.1 | kernel-image-2.6.8-sparc | 2.6.8-16sarge1 | DSA-1504-1 |
| Debian 3.1 | kernel-patch-powerpc-2.6.8 | 2.6.8-13sarge1 | DSA-1504-1 |
| Debian 3.1 | kernel-source-2.6.8 +3 | 2.6.8-17sarge1 | DSA-1504-1 |
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 5
- 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-1378-2 fai-kernels linux-2.6 user-mode-linux - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1504-1 kernel-image-2.6.8 - several issues Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1378-1 fai-kernels linux-2.6 user-mode-linux - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.22
- 27747 third-party-advisory
- 25672 vdb-entry
- oval:org.mitre.oval:def:9953 vdb-entry signature
- 28806 third-party-advisory
- RHSA-2007:0939 vendor-advisory
- 26978 third-party-advisory
- kernel-cifs-filesystem-dos(36593) vdb-entry
- DSA-1504 vendor-advisory
- http://support.avaya.com/elmodocs2/security/ASA-2007-474.htm
- MDVSA-2008:008 vendor-advisory
- 27912 third-party-advisory
- USN-518-1 vendor-advisory
- 26760 third-party-advisory
- RHSA-2007:0705 vendor-advisory
- MDVSA-2008:105 vendor-advisory
- SUSE-SA:2007:064 vendor-advisory
- 26955 third-party-advisory
- SUSE-SA:2008:006 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=253314
- 29058 third-party-advisory
- 27436 third-party-advisory
- DSA-1378 vendor-advisory