--- title: "CVE-2011-2918\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-2011-2918?format=md keywords: index, follow --- # CVE-2011-2918 Publication date 25 August 2011 Last updated 4 July 2026 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **5.5 · Medium** [Score breakdown](https://ubuntu.com/security/CVE-2011-2918?format=md#impact-score) Toggle side navigation ## Description The Performance Events subsystem in the Linux kernel before 3.1 does not properly handle event overflows associated with PERF\_COUNT\_SW\_CPU\_CLOCK events, which allows local users to cause a denial of service (system hang) via a crafted application. ### From the Ubuntu Security Team The performance counter subsystem did not correctly handle certain counters. A local attacker could exploit this to crash the system, leading to a denial of service. [Read the notes from the security team](https://ubuntu.com/security/CVE-2011-2918?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | 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 2.6.32-34.73 | | 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 2.6.32-318.37 | | 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 2.6.31-610.28 | | 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 2.6.32-418.35 | | 10.04 LTS lucid | Fixed 2.6.32-218.35 | | 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 2.6.35-903.24 | | 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-2011-2918?format=md#patch-details) ## Notes --- ### [jdstrand](https://launchpad.net/~jdstrand) https://lkml.org/lkml/2011/7/27/337 (reproducer) https://lkml.org/lkml/2011/7/28/284 (fix) --- ### [apw](https://launchpad.net/~apw) mainline fix: a8b0ca17b80e92faab46ee7179ba9e99ccb61233 stable fix: 462fee3af72df0de7b60b96c525ffe8baf4db0f0 http://git.kernel.org/?p=linux/kernel/git/stable/linux-3.0.y.git;a=commit;h=462fee3af72df0de7b60b96c525ffe8baf4db0f0 ### 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 [0793a61](https://git.kernel.org/linus/0793a61d4df8daeac6492dbf8d2f3e5713caae5e), fixed by [a8b0ca1](https://git.kernel.org/linus/a8b0ca17b80e92faab46ee7179ba9e99ccb61233) | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 5.5 · Medium * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Local | | Attack complexity | Low | | Privileges required | Low | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | None | | Integrity impact | None | | Availability impact | High | * Scores | Parameter | Value | | --- | --- | | Base score | 5.5 · Medium | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-2918) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2011-2918) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2011-2918) * [Debian](https://security-tracker.debian.org/tracker/CVE-2011-2918) ### Related Ubuntu Security Notices (USN) + [USN-1204-1](https://usn.ubuntu.com/USN-1204-1) + Linux kernel (i.MX51) vulnerabilities + 13 September 2011 + [USN-1208-1](https://usn.ubuntu.com/USN-1208-1) + Linux kernel (Marvel DOVE) vulnerabilities + 14 September 2011 + [USN-1219-1](https://usn.ubuntu.com/USN-1219-1) + Linux kernel (Maverick backport) vulnerabilities + 29 September 2011 + [USN-1202-1](https://usn.ubuntu.com/USN-1202-1) + Linux kernel (OMAP4) vulnerabilities + 13 September 2011 + [USN-1211-1](https://usn.ubuntu.com/USN-1211-1) + Linux kernel vulnerabilities + 21 September 2011 + [USN-1203-1](https://usn.ubuntu.com/USN-1203-1) + Linux kernel (Marvel DOVE) vulnerabilities + 13 September 2011 + [USN-1218-1](https://usn.ubuntu.com/USN-1218-1) + Linux kernel vulnerabilities + 29 September 2011 + [USN-1227-1](https://usn.ubuntu.com/USN-1227-1) + Linux kernel vulnerabilities + 11 October 2011 + [USN-1256-1](https://usn.ubuntu.com/USN-1256-1) + Linux kernel (Natty backport) vulnerabilities + 9 November 2011 + [USN-1212-1](https://usn.ubuntu.com/USN-1212-1) + Linux kernel (OMAP4) vulnerabilities + 21 September 2011 + [USN-1216-1](https://usn.ubuntu.com/USN-1216-1) + Linux kernel (EC2) vulnerabilities + 26 September 2011 ### Other references * *