CVE-2021-47111
xen-netback: take a reference to the RX task thread
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.
INFO
Published Date :
March 15, 2024, 9:15 p.m.
Last Modified :
Feb. 27, 2025, 3:20 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the Linux kernel.
- Run 'yum update kernel' to update the system.
Public PoC/Exploit Available at Github
CVE-2021-47111 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47111.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47111 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47111
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Ini adalah repository kumpulan CVE v.5
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47111 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47111 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 27, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-416 Added CPE Configuration OR *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:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 from (excluding) 5.12.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 from (excluding) 5.10.43 Added Reference Type CVE: https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 Added Reference https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 Added Reference https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Mar. 15, 2024
Action Type Old Value New Value Added 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. Added Reference kernel.org https://git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08 [No types assigned]