USN-4946-1: Linux kernel vulnerabilities
23745
07 December 2021
07 December 2021
CLOSED
MEDIUM
CVE-2021-20292,CVE-2021-26930,CVE-2021-26931,CVE-2021-28038,CVE-2021-28688,CVE-2021-29264,CVE-2021-29265,CVE-2021-29650,CVE-2021-30002
Severity
medium
Vendor
VMware Tanzu
Versions Affected
- Canonical Ubuntu 16.04
Description
It was discovered that the DRM subsystem in the Linux kernel contained double-free vulnerabilities. A privileged attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-20292)
Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Schönherr discovered that the Xen paravirtualization backend in the Linux kernel did not properly propagate errors to frontend drivers in some situations. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-26930)
Jan Beulich discovered that multiple Xen backends in the Linux kernel did not properly handle certain error conditions under paravirtualization. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-26931)
Jan Beulich discovered that the Xen netback backend in the Linux kernel did not properly handle certain error conditions under paravirtualization. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-28038)
It was discovered that the Xen paravirtualization backend in the Linux kernel did not properly deallocate memory in some situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-28688)
It was discovered that the Freescale Gianfar Ethernet driver for the Linux kernel did not properly handle receive queue overrun when jumbo frames were enabled in some situations. An attacker could use this to cause a denial of service (system crash). (CVE-2021-29264)
It was discovered that the USB/IP driver in the Linux kernel contained race conditions during the update of local and shared status. An attacker could use this to cause a denial of service (system crash). (CVE-2021-29265)
It was discovered that a race condition existed in the netfilter subsystem of the Linux kernel when replacing tables. A local attacker could use this to cause a denial of service (system crash). (CVE-2021-29650)
Arnd Bergmann discovered that the video4linux subsystem in the Linux kernel did not properly deallocate memory in some situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-30002)
CVEs contained in this USN include: CVE-2021-26930, CVE-2021-28038, CVE-2021-26931, CVE-2021-29265, CVE-2021-30002, CVE-2021-29650, CVE-2021-29264, CVE-2021-28688, CVE-2021-20292
Affected VMware Products and Versions
Severity is medium unless otherwise noted.
- Isolation Segment
- 2.7.x versions with Xenial Stemcells prior to 456.164
- 2.8.x versions with Xenial Stemcells prior to 621.129
- 2.9.x versions with Xenial Stemcells prior to 621.129
- 2.10.x versions with Xenial Stemcells prior to 621.129
- 2.11.x versions with Xenial Stemcells prior to 621.129
- Operations Manager
- 2.9.x versions prior to 2.9.19
- 2.10.x versions prior to 2.10.12
- VMware Tanzu Application Service for VMs
- 2.7.x versions with Xenial Stemcells prior to 456.164
- 2.8.x versions with Xenial Stemcells prior to 621.129
- 2.9.x versions with Xenial Stemcells prior to 621.129
- 2.10.x versions with Xenial Stemcells prior to 621.129
- 2.11.x versions with Xenial Stemcells prior to 621.129
- 2.12.x versions with Xenial Stemcells prior to 621.129
Mitigation
Users of affected products are strongly encouraged to follow the mitigation below. On the Tanzu Network product page for each release, check the Depends On section and/or Release Notes for this information. Releases that have fixed this issue include:- Isolation Segment
- 2.7.x: Upgrade Xenial Stemcells to 456.164 or greater
- 2.8.x: Upgrade Xenial Stemcells to 621.129 or greater
- 2.9.x: Upgrade Xenial Stemcells to 621.129 or greater
- 2.10.x: Upgrade Xenial Stemcells to 621.129 or greater
- 2.11.x: Upgrade Xenial Stemcells to 621.129 or greater
- Operations Manager
- 2.9.19
- 2.10.12
- VMware Tanzu Application Service for VMs
- 2.7.x: Upgrade Xenial Stemcells to 456.164 or greater
- 2.8.x: Upgrade Xenial Stemcells to 621.129 or greater
- 2.9.x: Upgrade Xenial Stemcells to 621.129 or greater
- 2.10.x: Upgrade Xenial Stemcells to 621.129 or greater
- 2.11.x: Upgrade Xenial Stemcells to 621.129 or greater
- 2.12.x: Upgrade Xenial Stemcells to 621.129 or greater
References
- https://people.canonical.com/~ubuntu-security/cve/CVE-2021-26930
- https://people.canonical.com/~ubuntu-security/cve/CVE-2021-28038
- https://people.canonical.com/~ubuntu-security/cve/CVE-2021-26931
- https://people.canonical.com/~ubuntu-security/cve/CVE-2021-29265
- https://people.canonical.com/~ubuntu-security/cve/CVE-2021-30002
- https://people.canonical.com/~ubuntu-security/cve/CVE-2021-29650
- https://people.canonical.com/~ubuntu-security/cve/CVE-2021-29264
- https://people.canonical.com/~ubuntu-security/cve/CVE-2021-28688
- https://people.canonical.com/~ubuntu-security/cve/CVE-2021-20292
- https://ubuntu.com/security/notices/USN-4946-1
History
2021-12-07: Initial vulnerability report published.