QID 198324

Date Published: 2021-04-21

QID 198324: Ubuntu Security Notification for Linux kernel vulnerabilities (USN-4907-1)

The xfs file system implementation in the linux kernel did not properly validate the number of extents in an inode
The priority inheritance futex implementation in the linux kernel contained a race condition, leading to a use-after-free vulnerability
The network block device (nbd) driver in the linux kernel contained a use-after-free vulnerability during device setup

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 (system crash) or possibly execute arbitrary code (CVE-2021-3347)
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)

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as High - 7.2 severity.
    • Solution
    Refer to Ubuntu advisory: USN-4907-1 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 198324

    CVE-2021-3348 | CVE-2021-3347 | CVE-2018-13095 |
    Software Advisories
    Advisory ID Software Component Link
    USN-4907-1 Ubuntu Linux URL Logo usn.ubuntu.com/4907-1
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