CVE-2021-47111

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47111
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.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 Patch
https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 Patch
https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e Patch
https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 Patch
https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 Patch
https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*
History

27 Feb 2025, 03:20

Type Values Removed Values Added
CWE CWE-416
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
References () https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 - () https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 - Patch
References () https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 - () https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 - Patch
References () https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e - () https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e - Patch
CPE cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
First Time Linux linux Kernel
Linux

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 - () https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 -
References () https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 - () https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 -
References () https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e - () https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e -

15 Mar 2024, 21:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-03-15 21:15

Updated : 2025-02-27 03:20

NVD link : CVE-2021-47111

Mitre link : CVE-2021-47111

CVE.ORG link : CVE-2021-47111

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free