USN-4367-2

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Source

https://ubuntu.com/security/notices/USN-4367-2

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4367-2.json

JSON Data

https://api.osv.dev/v1/vulns/USN-4367-2

Published

2020-05-28T22:46:00Z

Modified

2026-04-22T10:05:08Z

Summary

linux regression

Details

USN-4367-1 fixed vulnerabilities in the 5.4 Linux kernel. Unfortunately, that update introduced a regression in overlayfs. This update corrects the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service (system crash). (CVE-2019-19377)

It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565)

It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657)

References

Affected packages

Ubuntu:20.04:LTS / linux

Package

Name: linux
Purl: pkg:deb/ubuntu/linux@5.4.0-33.37?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

5.4.0-33.37

Affected versions

5.*

5.3.0-18.19

5.3.0-24.26

5.4.0-9.12

5.4.0-18.22

5.4.0-21.25

5.4.0-24.28

5.4.0-25.29

5.4.0-26.30

5.4.0-28.32

5.4.0-29.33

5.4.0-31.35

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Database specific

cves_map

{
    "cves":  [],
    "ecosystem":  "Ubuntu:20.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4367-2.json"