USN-4910-1

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Please try reporting it to the source first.
Source
https://ubuntu.com/security/notices/USN-4910-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4910-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-4910-1
Upstream
Related
Published
2021-04-13T20:41:12.754178Z
Modified
2025-10-13T04:35:26Z
Summary
linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities
Details

Ryota Shiga discovered that the sockopt BPF hooks in the Linux kernel could allow a user space program to probe for valid kernel addresses. A local attacker could use this to ease exploitation of another kernel vulnerability. (CVE-2021-20239)

It was discovered that the BPF verifier in the Linux kernel did not properly handle signed add32 and sub integer overflows. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-20268)

It was discovered that the priority inheritance futex implementation in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3347)

It was discovered that the network block device (nbd) driver in the Linux kernel contained a use-after-free vulnerability during device setup. A local attacker with access to the nbd device could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3348)

吴异 discovered that the NFS implementation in the Linux kernel did not properly prevent access outside of an NFS export that is a subdirectory of a file system. An attacker could possibly use this to bypass NFS access restrictions. (CVE-2021-3178)

References

Affected packages

Ubuntu:20.04:LTS / linux-hwe-5.8

Package

Name
linux-hwe-5.8
Purl
pkg:deb/ubuntu/linux-hwe-5.8@5.8.0-49.55~20.04.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.8.0-49.55~20.04.1

Affected versions

5.*

5.8.0-23.24~20.04.1
5.8.0-25.26~20.04.1
5.8.0-28.30~20.04.1
5.8.0-29.31~20.04.1
5.8.0-31.33~20.04.1
5.8.0-33.36~20.04.1
5.8.0-34.37~20.04.2
5.8.0-36.40~20.04.1
5.8.0-38.43~20.04.1
5.8.0-40.45~20.04.1
5.8.0-41.46~20.04.1
5.8.0-43.49~20.04.1
5.8.0-44.50~20.04.1
5.8.0-45.51~20.04.1
5.8.0-48.54~20.04.1

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    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "negligible"
                }
            ],
            "id": "CVE-2021-3178"
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2021-3347"
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2021-3348"
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "low"
                }
            ],
            "id": "CVE-2021-20239"
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2021-20268"
        }
    ]
}