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CVE-2021-47111 Details

Description

In the Linux kernel, the following vulnerability has been resolved: xen-netback: take a reference to the RX task thread Do this in order to prevent the task from being freed if the thread returns (which can be triggered by the frontend) before the call to kthread_stop done as part of the backend tear down. Not taking the reference will lead to a use-after-free in that scenario. Such reference was taken before but dropped as part of the rework done in 2ac061ce97f4. Reintroduce the reference taking and add a comment this time explaining why it's needed. This is XSA-374 / CVE-2021-28691.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA: kernel.orgCVSS-B:8.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 kernel.orgPatch
https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 kernel.orgPatch
https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e kernel.orgPatch
https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 CVEPatch
https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 CVEPatch

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-416Use After Free[email protected]

Affected Products

ProductVersions
linux linux kernel
>= 5.5, < 5.10.43
>= 5.11, < 5.12.10
5.13 rc1
5.13 rc2
5.13 rc3

CPE

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

8 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-47111
NVD Published Date:
Mar 15, 2024
NVD Last Modified:
Aug 4, 2026
Source:
kernel.org
CVE-2021-47111 Details - Not Deferred