cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:-:*:*:*

CVE-2021-3493

Known exploited
Public exploit
The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges.
Max CVSS
8.8
EPSS Score
0.59%
Published
2021-04-17
Updated
2023-07-07
CISA KEV Added
2022-10-20
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.
Max CVSS
8.8
EPSS Score
0.05%
Published
2021-04-17
Updated
2021-05-21
2 vulnerabilities found
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