--- title: "CVE-2011-1833\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2011-1833?format=md keywords: index, follow --- # CVE-2011-1833 Publication date 9 August 2011 Last updated 4 July 2026 --- Ubuntu priority **Low** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## Description Race condition in the ecryptfs\_mount function in fs/ecryptfs/main.c in the eCryptfs subsystem in the Linux kernel before 3.1 allows local users to bypass intended file permissions via a mount.ecryptfs\_private mount with a mismatched uid. ### From the Ubuntu Security Team Vasiliy Kulikov and Dan Rosenberg discovered that ecryptfs did not correctly check the origin of mount points. A local attacker could exploit this to trick the system into unmounting arbitrary mount points, leading to a denial of service. [Read the notes from the security team](https://ubuntu.com/security/CVE-2011-1833?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | ecryptfs-utils | 11.10 oneiric | Fixed 89-0ubuntu2 | | 11.04 natty | Fixed 87-0ubuntu1.1 | | 10.10 maverick | Fixed 83-0ubuntu3.2.10.10.1 | | 10.04 LTS lucid | Fixed 83-0ubuntu3.2.10.04.1 | | 8.04 LTS hardy | Not affected | | linux | 11.10 oneiric | Not affected | | 11.04 natty | Fixed 2.6.38-11.49 | | 10.10 maverick | Fixed 2.6.35-30.60 | | 10.04 LTS lucid | Fixed 2.6.32-35.78 | | 8.04 LTS hardy | Not affected | | linux-ec2 | 11.10 oneiric | Not in release | | 11.04 natty | Not in release | | 10.10 maverick | Ignored end of life | | 10.04 LTS lucid | Fixed 2.6.32-319.39 | | 8.04 LTS hardy | Not in release | | linux-fsl-imx51 | 11.10 oneiric | Not in release | | 11.04 natty | Not in release | | 10.10 maverick | Not in release | | 10.04 LTS lucid | Fixed 2.6.31-610.27 | | 8.04 LTS hardy | Not in release | | linux-lts-backport-maverick | 11.10 oneiric | Not in release | | 11.04 natty | Not in release | | 10.10 maverick | Not in release | | 10.04 LTS lucid | Fixed 2.6.35-30.60~lucid1 | | 8.04 LTS hardy | Not in release | | linux-lts-backport-natty | 11.10 oneiric | Not in release | | 11.04 natty | Not in release | | 10.10 maverick | Not in release | | 10.04 LTS lucid | Fixed 2.6.38-11.49~lucid1 | | 8.04 LTS hardy | Not in release | | linux-lts-backport-oneiric | 11.10 oneiric | Not in release | | 11.04 natty | Not in release | | 10.10 maverick | Not in release | | 10.04 LTS lucid | Not affected | | 8.04 LTS hardy | Not in release | | linux-mvl-dove | 11.10 oneiric | Not in release | | 11.04 natty | Not in release | | 10.10 maverick | Fixed 2.6.32-419.37 | | 10.04 LTS lucid | Fixed 2.6.32-219.37 | | 8.04 LTS hardy | Not in release | | linux-ti-omap4 | 11.10 oneiric | Not affected | | 11.04 natty | Fixed 2.6.38-1209.15 | | 10.10 maverick | Fixed 2.6.35-903.23 | | 10.04 LTS lucid | Not in release | | 8.04 LTS hardy | Not in release | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) * [Patch details](https://ubuntu.com/security/CVE-2011-1833?format=md#patch-details) ## Notes --- ### [mdeslaur](https://launchpad.net/~mdeslaur) There are two parts to this fix, 1- kernel fix, 2- userspace fix ### Patch details For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) | Package | Patch details | | --- | --- | | linux | * Introduced by [237fead](https://git.kernel.org/linus/237fead619984cc48818fe12ee0ceada3f55b012), fixed by [7643554](https://git.kernel.org/linus/764355487ea220fdc2faf128d577d7f679b91f97) | ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1833) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2011-1833) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2011-1833) * [Debian](https://security-tracker.debian.org/tracker/CVE-2011-1833) ### Related Ubuntu Security Notices (USN) + [USN-1219-1](https://usn.ubuntu.com/USN-1219-1) + Linux kernel (Maverick backport) vulnerabilities + 29 September 2011 + [USN-1253-1](https://usn.ubuntu.com/USN-1253-1) + Linux kernel vulnerabilities + 8 November 2011 + [USN-1211-1](https://usn.ubuntu.com/USN-1211-1) + Linux kernel vulnerabilities + 21 September 2011 + [USN-1202-1](https://usn.ubuntu.com/USN-1202-1) + Linux kernel (OMAP4) vulnerabilities + 13 September 2011 + [USN-1239-1](https://usn.ubuntu.com/USN-1239-1) + Linux kernel (EC2) vulnerabilities + 25 October 2011 + [USN-1188-1](https://usn.ubuntu.com/USN-1188-1) + eCryptfs vulnerabilities + 9 August 2011 + [USN-1227-1](https://usn.ubuntu.com/USN-1227-1) + Linux kernel vulnerabilities + 11 October 2011 + [USN-1240-1](https://usn.ubuntu.com/USN-1240-1) + Linux kernel (Marvell DOVE) vulnerabilities + 25 October 2011 + [USN-1204-1](https://usn.ubuntu.com/USN-1204-1) + Linux kernel (i.MX51) vulnerabilities + 13 September 2011 + [USN-1256-1](https://usn.ubuntu.com/USN-1256-1) + Linux kernel (Natty backport) vulnerabilities + 9 November 2011 + [USN-1245-1](https://usn.ubuntu.com/USN-1245-1) + Linux kernel (Marvell DOVE) vulnerabilities + 25 October 2011 + [USN-1212-1](https://usn.ubuntu.com/USN-1212-1) + Linux kernel (OMAP4) vulnerabilities + 21 September 2011 ### Other references *