Description
Multiple buffer overflows in the cifs subsystem in the Linux kernel before 2.6.29.4 allow remote CIFS servers to cause a denial of service (memory corruption) and possibly have unspecified other impact via (1) a malformed Unicode string, related to Unicode string area alignment in fs/cifs/sess.c; or (2) long Unicode characters, related to fs/cifs/cifssmb.c and the cifs_readdir function in fs/cifs/readdir.c.
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 5.0 | linux-2.6 | 2.6.26-15lenny3 | DSA-1809-1 |
| Debian 5.0 | user-mode-linux | 2.6.26-1um-2+15lenny3 | DSA-1809-1 |
| Debian 4.0 | fai-kernels | 1.17+etch.24etch3 | DSA-1865-1 |
| Debian 4.0 | linux-2.6 | 2.6.18.dfsg.1-24etch3 | DSA-1865-1 |
| Debian 4.0 | linux-2.6.24 | 2.6.24-6~etchnhalf.8etch2 | DSA-1844-1 |
| Debian 4.0 | user-mode-linux | 2.6.18-1um-2etch.24etch3 | DSA-1865-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | kernel +12 | 2.6.18-128.1.14.el5 | RHSA-2009:1106 |
| RHEL 4 | kernel +10 | 2.6.9-89.0.7.EL | RHSA-2009:1211 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat MRG 1 | kernel-rt +9 | 2.6.24.7-126.el5rt | RHSA-2009:1157 |
Advisories 6
- RHSA-2009:1211 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2009:1157 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2009:1106 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-1844-1 linux-2.6.24 - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1865-1 fai-kernels linux-2.6 user-mode-linux - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1809-1 linux-2.6 user-mode-linux - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- DSA-1865 vendor-advisory
- http://wiki.rpath.com/Advisories:rPSA-2009-0111
- 35226 third-party-advisory
- [oss-security] 20090514 Update - Re: CVE request? buffer overflow in CIFS in 2.6.* mailing-list
- 37471 third-party-advisory
- FEDORA-2009-5356 vendor-advisory
- oval:org.mitre.oval:def:8588 vdb-entry signature
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=27b87fe52baba0a55e9723030e76fce94fabcea4
- MDVSA-2009:148 vendor-advisory
- 35656 third-party-advisory
- DSA-1844 vendor-advisory
- http://www.vmware.com/security/advisories/VMSA-2009-0016.html
- [oss-security] 20090515 Re: Re: Update - Re: CVE request? buffer overflow in CIFS in 2.6.* mailing-list
- oval:org.mitre.oval:def:9525 vdb-entry signature
- 37351 third-party-advisory
- [oss-security] 20090429 Re: CVE request? buffer overflow in CIFS in 2.6.* mailing-list
- SUSE-SA:2009:056 vendor-advisory
- SUSE-SA:2010:012 vendor-advisory
- RHSA-2009:1157 vendor-advisory
- 34612 vdb-entry
- 20090724 rPSA-2009-0111-1 kernel mailing-list
- 20091120 VMSA-2009-0016 VMware vCenter and ESX update release and vMA patch release address multiple security issue in third party components mailing-list
- 36051 third-party-advisory
- 35298 third-party-advisory
- 36327 third-party-advisory
- USN-793-1 vendor-advisory
- FEDORA-2009-5383 vendor-advisory
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.29.4
- [oss-security] 20090429 Re: CVE request? buffer overflow in CIFS in 2.6.* mailing-list
- http://git.kernel.org/?p=linux/kernel/git/sfrench/cifs-2.6.git%3Ba=commit%3Bh=7b0c8fcff47a885743125dd843db64af41af5a61
- 35217 third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=496572
- http://git.kernel.org/?p=linux/kernel/git/sfrench/cifs-2.6.git%3Ba=commit%3Bh=968460ebd8006d55661dec0fb86712b40d71c413
- SUSE-SA:2009:054 vendor-advisory
- ADV-2009-3316 vdb-entry
- DSA-1809 vendor-advisory
- 35847 third-party-advisory
- [oss-security] 20090514 Re: Update - Re: CVE request? buffer overflow in CIFS in 2.6.* mailing-list