What’s Vulnerable › Vulnerabilities

CVE-2010-2524

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2010-09-08 · updated 2026-06-16

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.

Affected products

• Canonical Ubuntu Linux: 6.06, 8.04, 9.04, 9.10, 10.04, 10.10
• Linux kernel: before 2.6.35 — fixed in 2.6.35
• Suse Linux Enterprise Desktop: 11-sp1
• SUSE Linux Enterprise: 11-sp1
• VMware ESX: 4.0, 4.1

How to fix

Upgrade to a fixed version: Linux kernel 2.6.35. Check the vendor advisory for mitigations.

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.html
• http://marc.info/?l=oss-security&m=128072090331700&w=2
• http://marc.info/?l=oss-security&m=128078387328921&w=2
• http://marc.info/?l=oss-security&m=128080755321157&w=2
• http://secunia.com/advisories/43315
• http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.35
• http://www.mandriva.com/security/advisories?name=MDVSA-2010:172
• http://www.redhat.com/support/errata/RHSA-2010-0610.html
• http://www.securityfocus.com/archive/1/516397/100/0/threaded
• http://www.ubuntu.com/usn/USN-1000-1
• http://www.vmware.com/security/advisories/VMSA-2011-0003.html

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