Executive Summary

Informations
Name CVE-2021-47541 First vendor Publication 2024-05-24
Vendor Cve Last vendor Modification 2024-06-10

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 7.8
Base Score 7.8 Environmental Score 7.8
impact SubScore 5.9 Temporal Score 7.8
Exploitabality Sub Score 1.8
 
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
Calculate full CVSS 2.0 Vectors scores

Detail

In the Linux kernel, the following vulnerability has been resolved:

net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()

In mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called and tmp->tx_cq will be freed on the error path of mlx4_en_copy_priv(). After that mlx4_en_alloc_resources() is called and there is a dereference of &tmp->tx_cq[t][i] in mlx4_en_alloc_resources(), which could lead to a use after free problem on failure of mlx4_en_copy_priv().

Fix this bug by adding a check of mlx4_en_copy_priv()

This bug was found by a static analyzer. The analysis employs differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug.

Builds with CONFIG_MLX4_EN=m show no new warnings, and our static analyzer no longer warns about this code.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47541

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-416 Use After Free

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 7
Os 3447

Sources (Detail)

https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275
https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18
https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570
https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757
https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68
https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b
Source Url

Alert History

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0
1
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Date Informations
2024-06-11 00:27:55
  • Multiple Updates
2024-05-25 00:27:24
  • Multiple Updates
2024-05-24 21:28:51
  • First insertion