QID 198323

Date Published: 2021-04-15

QID 198323: Ubuntu Security Notification for Linux kernel vulnerabilities (USN-4904-1)

The linux kernel would strip extended privilege attributes of files when performing a failed unprivileged system call
The video4linux driver for hauppauge hd pvr usb devices in the linux kernel did not properly handle some error conditions
The timer stats implementation in the linux kernel allowed the discovery of a real pid value while inside a pid namespace
The xfs file system implementation in the linux kernel did not properly validate the number of extents in an inode
The fujitsu es network device driver for the linux kernel did not properly check for errors in some situations, leading to a null pointer dereference
The marvell 8xxx libertas wlan device driver in the linux kernel did not properly check for errors in certain situations, leading to a null pointer dereference
The adis16400 iio imu driver for the linux kernel did not properly deallocate memory in certain error conditions
A race condition existed in the floppy device driver in the linux kernel
The xen paravirtualization bckend in the linux kernel did not properly propagate errors to frontend drivers in some situations
Multiple xen backends in the linux kernel did not properly handle certain error conditions under paravirtualization
The xen netback backend in the linux kernel did not properly handle certain error conditions under paravirtualization

A local attacker could use this to cause a denial of service (CVE-2015-1350)
A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code (CVE-2017-16644)
A local attacker could use this to expose sensitive information (CVE-2017-5967)
An attacker could use this to construct a malicious xfs image that, when mounted, could cause a denial of service (system crash) (CVE-2018-13095)
A local attacker could use this to cause a denial of service (CVE-2019-16231)
A local attacker could possibly use this to cause a denial of service (CVE-2019-16232)
A local attacker could use this to cause a denial of service (memory exhaustion) (CVE-2019-19061)
An attacker with access to the floppy device could use this to cause a denial of service (system crash) or possibly execute arbitrary code (CVE-2021-20261)
An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash) (CVE-2021-26930)
An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash) (CVE-2021-26931)
An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash) (CVE-2021-28038)

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as High - 7.2 severity.
  • Solution
    Refer to Ubuntu advisory: USN-4904-1 for affected packages and patching details, or update with your package manager.
    Vendor References
    Software Advisories
    Advisory ID Software Component Link
    USN-4904-1 Ubuntu Linux URL Logo usn.ubuntu.com/4904-1