CVE-2021-3492
High
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.
SeverityHigh
CVSS8.8
Exploit probability—
ProductCanonical Ubuntu Linux
PublishedApr 17, 2021
First seenApr 17, 2021
Weakness typeCWE-415CWE-415CWE-401CWE-401
How to fix
Update
- canonical ubuntu_linux18.04, 20.04, 20.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| canonical ubuntu_linux | v < 18.04, 18.04.1 ≤ v < 20.04, v < 20.10 | 18.04, 20.04, 20.10 |
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