--- title: "CVE-2010-2524\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-2010-2524?format=md keywords: index, follow --- # CVE-2010-2524 Publication date 8 September 2010 Last updated 25 August 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **7.8 · High** [Score breakdown](https://ubuntu.com/security/CVE-2010-2524?format=md#impact-score) Toggle side navigation ## Description The DNS resolution functionality in the CIFS implementation in the Linux kernel before 2.6.35, when CONFIG\_CIFS\_DFS\_UPCALL is enabled, relies on a user's keyring for the dns\_resolver upcall in the cifs.upcall userspace helper, which allows local users to spoof the results of DNS queries and perform arbitrary CIFS mounts via vectors involving an add\_key call, related to a "cache stuffing" issue and MS-DFS referrals. ### From the Ubuntu Security Team David Howells discovered that DNS resolution in CIFS could be spoofed. A local attacker could exploit this to control DNS replies, leading to a loss of privacy and possible privilege escalation. [Read the notes from the security team](https://ubuntu.com/security/CVE-2010-2524?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | linux | 10.10 maverick | Not affected | | 10.04 LTS lucid | Fixed 2.6.32-25.43 | | 9.10 karmic | Fixed 2.6.31-22.67 | | 9.04 jaunty | Ignored | | 8.04 LTS hardy | Not affected | | 6.06 LTS dapper | Not in release | | linux-ec2 | 10.10 maverick | Ignored end of life | | 10.04 LTS lucid | Fixed 2.6.32-309.18 | | 9.10 karmic | Fixed 2.6.31-307.21 | | 8.04 LTS hardy | Not in release | | 6.06 LTS dapper | Not in release | | linux-fsl-imx51 | 10.10 maverick | Not in release | | 10.04 LTS lucid | Fixed 2.6.31-608.22 | | 9.10 karmic | Fixed 2.6.31-112.30 | | 8.04 LTS hardy | Not in release | | 6.06 LTS dapper | Not in release | | linux-lts-backport-maverick | 10.10 maverick | Not in release | | 10.04 LTS lucid | Fixed 2.6.35-25.44~lucid1 | | 9.10 karmic | Not in release | | 8.04 LTS hardy | Not in release | | 6.06 LTS dapper | Not in release | | linux-source-2.6.15 | 10.10 maverick | Not in release | | 10.04 LTS lucid | Not in release | | 9.10 karmic | Not in release | | 9.04 jaunty | Not in release | | 8.04 LTS hardy | Not in release | | 6.06 LTS dapper | Not affected | --- * [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-2010-2524?format=md#patch-details) ## Notes --- ### [sbeattie](https://launchpad.net/~sbeattie) according to oss-security discussion, git commit 6103335de8afa5d780dcd512abe85c696af7b040 introduced the problem, so 2.6.25-rc1 onwards. --- ### [smb](https://launchpad.net/~smb) Jaunty \*may\* be affected, but the problem is that there is no infra- structure for thread credentials, so even if it is possible to back- port the whole thing it would be completely different and prone to be incorrect. That together with the fact that Jaunty is EOL more or less I don't think we should put in much effort there. ### 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 | * Upstream: * Karmic: | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 7.8 · High * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Local | | Attack complexity | Low | | Privileges required | Low | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | High | | Integrity impact | High | | Availability impact | High | * Scores | Parameter | Value | | --- | --- | | Base score | 7.8 · High | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2524) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2010-2524) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2010-2524) * [Debian](https://security-tracker.debian.org/tracker/CVE-2010-2524) ### Related Ubuntu Security Notices (USN) + [USN-1074-1](https://usn.ubuntu.com/USN-1074-1) + Linux kernel vulnerabilities + 25 February 2011 + [USN-1083-1](https://usn.ubuntu.com/USN-1083-1) + Linux kernel vulnerabilities + 3 March 2011 + [USN-1000-1](https://usn.ubuntu.com/USN-1000-1) + Linux kernel vulnerabilities + 19 October 2010 + [USN-1074-2](https://usn.ubuntu.com/USN-1074-2) + Linux kernel vulnerabilities + 28 February 2011 ### Other references *