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Shiftfs, an out-of-tree stacking file system included in...

High severity Unreviewed Published May 24, 2022 to the GitHub Advisory Database • Updated Jan 29, 2023

Package

No package listed— Suggest a package

Affected versions

Unknown

Patched versions

Unknown

Description

Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562.

References

Published by the National Vulnerability Database Apr 17, 2021
Published to the GitHub Advisory Database May 24, 2022
Last updated Jan 29, 2023

Severity

High

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(97th percentile)

Weaknesses

Double Free

The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Learn more on MITRE.

CVE ID

CVE-2021-3492

GHSA ID

GHSA-hr5j-7qj8-mpp3

Source code

No known source code

Dependabot alerts are not supported on this advisory because it does not have a package from a supported ecosystem with an affected and fixed version.

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