Linux Kernel 5.4.0-rc2 kernel/trace/blktrace.c __blk_add_trace use after free

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel 5.4.0-rc2. This affects the function __blk_add_trace of the file kernel/trace/blktrace.c. The manipulation leads to use after free. This vulnerability is traded as CVE-2019-19768. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel 5.4.0-rc2 (Operating System). It has been rated as critical. This issue affects the function __blk_add_trace of the file kernel/trace/blktrace.c. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel 5.4.0-rc2, there is a use-after-free (read) in the __blk_add_trace function in kernel/trace/blktrace.c (which is used to fill out a blk_io_trace structure and place it in a per-cpu sub-buffer).

The weakness was shared 12/12/2019. The identification of this vulnerability is CVE-2019-19768 since 12/12/2019. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/12/2024).

The vulnerability scanner Nessus provides a plugin with the ID 208643 (CentOS 7 : kernel-alt (RHSA-2020:2104)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (208643). The entries VDB-147151, VDB-147150 and VDB-147148 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.4.0-rc2

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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