Description
The SMB2_tcon function in fs/cifs/smb2pdu.c in the Linux kernel before 3.16.3 allows remote CIFS servers to cause a denial of service (NULL pointer dereference and client system crash) or possibly have unspecified other impact by deleting the IPC$ share during resolution of DFS referrals.
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 14 | linux | 3.16.3-1 | — |
| Debian 13 | linux | 3.16.3-1 | — |
| Debian 12 | linux | 3.16.3-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux | 3.13.0-39.66 | USN-2395-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | perf +17 | 3.10.0-123.20.1.el7 | RHSA-2015:0102 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-55.1.5.el6uek | 0.4.3-4.el6 | ELSA-2015-3003 |
| Oracle Linux 7 | dtrace-modules-3.8.13-55.1.5.el7uek | 0.4.3-4.el7 | ELSA-2015-3003 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-55.1.5.el7uek | ELSA-2015-3003 |
| Oracle Linux 7 | perf +11 | 3.10.0-123.20.1.el7 | ELSA-2015-0102 |
Advisories 4
- RHSA-2015:0102 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-2395-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- ELSA-2015-3003 Important: Unbreakable Enterprise kernel security and bugfix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 29, 2015
- ELSA-2015-0102 Important: kernel security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 28, 2015
References
- USN-2394-1 vendor-advisory
- [oss-security] 20140922 Re: CVE request: [CIFS] Possible null ptr deref in SMB2_tcon / Linux kernel mailing-list
- https://github.com/torvalds/linux/commit/18f39e7be0121317550d03e267e3ebd4dbfbb3ce
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.16.3
- 69867 vdb-entry
- RHSA-2015:0102 vendor-advisory
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=18f39e7be0121317550d03e267e3ebd4dbfbb3ce