USN-4751-1

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Source
https://ubuntu.com/security/notices/USN-4751-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/USN-4751-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-4751-1
Related
Published
2021-02-25T06:43:06.919647Z
Modified
2021-02-25T06:43:06.919647Z
Summary
linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities
Details

It was discovered that the console keyboard driver in the Linux kernel contained a race condition. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-25656)

Minh Yuan discovered that the tty driver in the Linux kernel contained race conditions when handling fonts. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2020-25668)

Bodong Zhao discovered a use-after-free in the Sun keyboard driver implementation in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2020-25669)

Kiyin (尹亮) discovered that the perf subsystem in the Linux kernel did not properly deallocate memory in some situations. A privileged attacker could use this to cause a denial of service (kernel memory exhaustion). (CVE-2020-25704)

Julien Grall discovered that the Xen dom0 event handler in the Linux kernel did not properly limit the number of events queued. An attacker in a guest VM could use this to cause a denial of service in the host OS. (CVE-2020-27673)

Jinoh Kang discovered that the Xen event channel infrastructure in the Linux kernel contained a race condition. An attacker in guest could possibly use this to cause a denial of service (dom0 crash). (CVE-2020-27675)

Daniel Axtens discovered that PowerPC RTAS implementation in the Linux kernel did not properly restrict memory accesses in some situations. A privileged local attacker could use this to arbitrarily modify kernel memory, potentially bypassing kernel lockdown restrictions. (CVE-2020-27777)

It was discovered that the jfs file system implementation in the Linux kernel contained an out-of-bounds read vulnerability. A local attacker could use this to possibly cause a denial of service (system crash). (CVE-2020-27815)

Shisong Qin and Bodong Zhao discovered that Speakup screen reader driver in the Linux kernel did not correctly handle setting line discipline in some situations. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-27830, CVE-2020-28941)

It was discovered that a use-after-free vulnerability existed in the infiniband hfi1 device driver in the Linux kernel. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2020-27835)

It was discovered that an information leak existed in the syscall implementation in the Linux kernel on 32 bit systems. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-28588)

Minh Yuan discovered that the framebuffer console driver in the Linux kernel did not properly handle fonts in some conditions. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-28974)

Michael Kurth and Pawel Wieczorkiewicz discovered that the Xen event processing backend in the Linux kernel did not properly limit the number of events queued. An attacker in a guest VM could use this to cause a denial of service in the host OS. (CVE-2020-29568)

Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the Xen paravirt block backend in the Linux kernel, leading to a use-after-free vulnerability. An attacker in a guest VM could use this to cause a denial of service in the host OS. (CVE-2020-29569)

Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-29660)

Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the TIOCSPGRP ioctl(), 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-2020-29661)

It was discovered that a race condition existed that caused the Linux kernel to not properly restrict exit signal delivery. A local attacker could possibly use this to send signals to arbitrary processes. (CVE-2020-35508)

References

Affected packages

Ubuntu:20.04:LTS / linux-hwe-5.8

Package

Name
linux-hwe-5.8

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.8.0-44.50~20.04.1

Ecosystem specific

{
    "availability": "No subscription needed",
    "binaries": [
        {
            "linux-image-generic-64k-hwe-20.04": "5.8.0.44.50~20.04.30",
            "linux-image-generic-hwe-20.04-edge": "5.8.0.44.50~20.04.30",
            "linux-image-virtual-hwe-20.04-edge": "5.8.0.44.50~20.04.30",
            "linux-image-5.8.0-44-lowlatency": "5.8.0-44.50~20.04.1",
            "linux-image-generic-64k-hwe-20.04-edge": "5.8.0.44.50~20.04.30",
            "linux-image-lowlatency-hwe-20.04-edge": "5.8.0.44.50~20.04.30",
            "linux-image-generic-lpae-hwe-20.04-edge": "5.8.0.44.50~20.04.30",
            "linux-image-5.8.0-44-generic-lpae": "5.8.0-44.50~20.04.1",
            "linux-image-generic-lpae-hwe-20.04": "5.8.0.44.50~20.04.30",
            "linux-image-lowlatency-hwe-20.04": "5.8.0.44.50~20.04.30",
            "linux-image-generic-hwe-20.04": "5.8.0.44.50~20.04.30",
            "linux-image-virtual-hwe-20.04": "5.8.0.44.50~20.04.30",
            "linux-image-5.8.0-44-generic": "5.8.0-44.50~20.04.1"
        }
    ]
}