Denial of Service (DoS) Affecting torvalds/linux package, versions [3.2,5.10.17)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.07% (22nd percentile)

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  • Snyk IDSNYK-UNMANAGED-TORVALDSLINUX-3005722
  • published26 Jan 2022
  • disclosed17 Feb 2021
  • creditUnknown

Introduced: 17 Feb 2021

CVE-2021-26932  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

Upgrade torvalds/linux to version 5.10.17 or higher.

Overview

Affected versions of this package are vulnerable to Denial of Service (DoS). An issue was discovered in the Linux kernel 3.2 through 5.10.16, as used by Xen. Grant mapping operations often occur in batch hypercalls, where a number of operations are done in a single hypercall, the success or failure of each one is reported to the backend driver, and the backend driver then loops over the results, performing follow-up actions based on the success or failure of each operation. Unfortunately, when running in PV mode, the Linux backend drivers mishandle this: Some errors are ignored, effectively implying their success from the success of related batch elements. In other cases, errors resulting from one batch element lead to further batch elements not being inspected, and hence successful ones to not be possible to properly unmap upon error recovery. Only systems with Linux backends running in PV mode are vulnerable. Linux backends run in HVM / PVH modes are not vulnerable. This affects arch/*/xen/p2m.c and drivers/xen/gntdev.c.

CVSS Base Scores

version 3.1