CVE-2010-2524

Name: CVE-2010-2524
Creator: NVD / NIST
Published: 2010-09-08T20:00:02.823+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.42%

Last modified Jun 16, 2026

CVE-2010-2524 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.42%

33.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions	Update
Linux	Linux Kernel	< 2.6.35	—
Vmware	Esx	4.0	—
Vmware	Esx	4.1	—
Canonical	Ubuntu Linux	6.06	—
Canonical	Ubuntu Linux	8.04	—
Canonical	Ubuntu Linux	9.04	—
Canonical	Ubuntu Linux	9.10	—
Canonical	Ubuntu Linux	10.04	—
Canonical	Ubuntu Linux	10.10	—
Suse	Suse Linux Enterprise Desktop	11	Sp1
Suse	Suse Linux Enterprise Server	11	Sp1

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=4c0c03ca54f72fdd5912516ad0a23ec5cf01bda7
http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00004.htmlMailing List, Third Party Advisory
http://marc.info/?l=oss-security&m=128072090331700&w=2Mailing List, Patch, Third Party Advisory
http://marc.info/?l=oss-security&m=128078387328921&w=2Mailing List, Patch, Third Party Advisory
http://marc.info/?l=oss-security&m=128080755321157&w=2Mailing List, Third Party Advisory
http://secunia.com/advisories/43315Broken Link
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.35Broken Link
http://www.mandriva.com/security/advisories?name=MDVSA-2010:172Broken Link
http://www.redhat.com/support/errata/RHSA-2010-0610.htmlBroken Link
http://www.securityfocus.com/archive/1/516397/100/0/threadedThird Party Advisory, VDB Entry
http://www.ubuntu.com/usn/USN-1000-1Third Party Advisory
http://www.vmware.com/security/advisories/VMSA-2011-0003.htmlPatch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=612166Issue Tracking, Patch, Third Party Advisory
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=4c0c03ca54f72fdd5912516ad0a23ec5cf01bda7
http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00004.htmlMailing List, Third Party Advisory
http://marc.info/?l=oss-security&m=128072090331700&w=2Mailing List, Patch, Third Party Advisory
http://marc.info/?l=oss-security&m=128078387328921&w=2Mailing List, Patch, Third Party Advisory
http://marc.info/?l=oss-security&m=128080755321157&w=2Mailing List, Third Party Advisory
http://secunia.com/advisories/43315Broken Link
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.35Broken Link
http://www.mandriva.com/security/advisories?name=MDVSA-2010:172Broken Link
http://www.redhat.com/support/errata/RHSA-2010-0610.htmlBroken Link
http://www.securityfocus.com/archive/1/516397/100/0/threadedThird Party Advisory, VDB Entry
http://www.ubuntu.com/usn/USN-1000-1Third Party Advisory
http://www.vmware.com/security/advisories/VMSA-2011-0003.htmlPatch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=612166Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Sep 8, 2010
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2010-2524?

How severe is CVE-2010-2524?

CVE-2010-2524 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2010-2524?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2010-2524?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST