Description
The compat_sys_mount function in fs/compat.c in Linux kernel 2.6.20 and earlier allows local users to cause a denial of service (NULL pointer dereference and oops) by mounting a smbfs file system in compatibility mode ("mount -t smbfs").
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 | 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 | 2.6.18-8.1.6.el5 | RHSA-2007:0376 |
| RHEL 4 | kernel +10 | 2.6.9-55.0.2.EL | RHSA-2007:0488 |
Advisories 3
- RHSA-2007:0376 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2007:0488 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1504-1 kernel-image-2.6.8 - several issues Debian Security (DSA / DLA) · Mar 9, 2026
References
- SUSE-SA:2007:043 vendor-advisory
- 26289 third-party-advisory
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff_plain%3Bh=822191a2fa1584a29c3224ab328507adcaeac1ab
- 25838 third-party-advisory
- MDKSA-2007:171 vendor-advisory
- DSA-1504 vendor-advisory
- oval:org.mitre.oval:def:10941 vdb-entry signature
- 25683 third-party-advisory
- 26620 third-party-advisory
- USN-489-1 vendor-advisory
- MDKSA-2007:196 vendor-advisory
- 25961 third-party-advisory
- http://support.avaya.com/elmodocs2/security/ASA-2007-287.htm
- ADV-2007-2209 vdb-entry
- 29058 third-party-advisory
- 25682 third-party-advisory
- RHSA-2007:0376 vendor-advisory
- USN-486-1 vendor-advisory
- SUSE-SA:2007:035 vendor-advisory
- 25700 third-party-advisory
- 26139 third-party-advisory
- RHSA-2007:0488 vendor-advisory
- 26133 third-party-advisory