Linux Kernel up to 5.0.7 Namespace Cleanup net/rds/tcp.c rds_tcp_kill_sock race condition

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 5.0.7. The affected element is the function rds_tcp_kill_sock of the file net/rds/tcp.c of the component Namespace Cleanup Handler. Such manipulation leads to race condition. This vulnerability is uniquely identified as CVE-2019-11815. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.0.7 (Operating System) and classified as very critical. Affected by this issue is the function rds_tcp_kill_sock of the file net/rds/tcp.c of the component Namespace Cleanup Handler. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in rds_tcp_kill_sock in net/rds/tcp.c in the Linux kernel before 5.0.8. There is a race condition leading to a use-after-free, related to net namespace cleanup.

The bug was discovered 03/28/2019. The weakness was disclosed 05/08/2019 (Website). The advisory is shared for download at cdn.kernel.org. This vulnerability is handled as CVE-2019-11815 since 05/08/2019. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/15/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 41 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172398 (OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2019:1407-1)).

Upgrading to version 5.0.8 eliminates this vulnerability. The upgrade is hosted for download at git.kernel.org.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 108283†). bleepingcomputer.com is providing further details. The entries VDB-133998, VDB-134452, VDB-134460 and VDB-134461 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Once again VulDB remains the best source for vulnerability data.

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