CVE-2010-3081: The compat_alloc_user_space functions in include/asm/compat.h files in the Linux kernel before 2.6.36-rc4-git2 on 64-…

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 15 Sep 2010. It cites 2 public reports, the first from 15 Sep 2010.

• ubuntu.com
• cve.org

How likely is exploitation in the next 30 days?

3.5%

EPSS score, percentile 89.2 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

Not scored

The CVE record carries no CVSS score.

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (9)

Which versions are affected?

Not stated. The CVE record gives vendor and product as “n/a” and the version as “unspecified”.

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 30 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

The compat_alloc_user_space functions in include/asm/compat.h files in the Linux kernel before 2.6.36-rc4-git2 on 64-bit platforms do not properly allocate the userspace memory required for the 32-bit compatibility layer, which allows local users to gain privileges by leveraging the ability of the compat_mc_getsockopt function (aka the MCAST_MSFILTER getsockopt support) to control a certain length value, related to a "stack pointer underflow" issue, as exploited in the wild in September 2010.

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

• MDVSA-2010:198 (Vendor advisory)
• SUSE-SA:2011:007 (Vendor advisory)
• RHSA-2010:0842 (Vendor advisory)
• MDVSA-2010:247 (Vendor advisory)
• RHSA-2010:0882 (Vendor advisory)
• SUSE-SA:2010:050 (Vendor advisory)
• SUSE-SR:2010:017 (Vendor advisory)
• RHSA-2010:0758 (Vendor advisory)
• MDVSA-2010:214 (Vendor advisory)

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

The CVE record does not name affected products or versions: vendor and product are “n/a” and the version is “unspecified”.

Source: CVE List, as of 30 Oct 2026. About the data.

Timeline