canonical ubuntu-linux CVE-2022-0185 in Canonical and Linux Products
Published on February 11, 2022

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A heap-based buffer overflow flaw was found in the way the legacy_parse_param function in the Filesystem Context functionality of the Linux kernel verified the supplied parameters length. An unprivileged (in case of unprivileged user namespaces enabled, otherwise needs namespaced CAP_SYS_ADMIN privilege) local user able to open a filesystem that does not support the Filesystem Context API (and thus fallbacks to legacy handling) could use this flaw to escalate their privileges on the system.

NVD

Known Exploited Vulnerability

This Linux Kernel Heap-Based Buffer Overflow vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Linux kernel contains a heap-based buffer overflow vulnerability in the legacy_parse_param function in the Filesystem Context functionality. This allows an attacker to open a filesystem that does not support the Filesystem Context API and ultimately escalate privileges.

The following remediation steps are recommended / required by September 11, 2024: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.

Vulnerability Analysis

CVE-2022-0185 can be exploited with local system access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 2.5 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

What is an Integer underflow Vulnerability?

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This can happen in signed and unsigned cases.

CVE-2022-0185 has been classified to as an Integer underflow vulnerability or weakness.


Products Associated with CVE-2022-0185

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Canonical Ubuntu Linux
 
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What versions are vulnerable to CVE-2022-0185?

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