Description
The cifs_iovec_write function in fs/cifs/file.c in the Linux kernel through 3.13.5 does not properly handle uncached write operations that copy fewer than the requested number of bytes, which allows local users to obtain sensitive information from kernel memory, cause a denial of service (memory corruption and system crash), or possibly gain privileges via a writev system call with a crafted pointer.
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 | 3.13.6-1 | — |
| Debian 13 | linux | 3.13.6-1 | — |
| Debian 12 | linux | 3.13.6-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | perf +16 | 2.6.32-431.11.2.el6 | RHSA-2014:0328 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat MRG 2 | kernel-rt +10 | 3.10.33-rt32.33.el6rt | RHSA-2014:0439 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kernel | 6.6.29.1-4 | — |
| Azure Linux 2 (CBL-Mariner) | kernel | 5.15.148.2-2 | — |
Advisories 2
- RHSA-2014:0328 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:0439 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jan 7, 2026
References
- [linux-cifs] 20140214 [PATCH] cifs: ensure that uncached writes handle unmapped areas correctly mailing-list
- 65588 vdb-entry
- https://github.com/torvalds/linux/commit/5d81de8e8667da7135d3a32a964087c0faf5483f
- RHSA-2014:0328 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1064253
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=5d81de8e8667da7135d3a32a964087c0faf5483f
- [oss-security] 20140217 CVE-2014-0069 -- kernel: cifs: incorrect handling of bogus user pointers during uncached writes mailing-list
- SUSE-SU-2014:0459 vendor-advisory