Linux Kernel up to 5.15.6 octeontx2-af rvu_mbox_init memory leak

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.15.6. This issue affects the function rvu_mbox_init of the component octeontx2-af. Executing a manipulation can lead to memory leak. This vulnerability is tracked as CVE-2021-47537. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.15.6. It has been declared as critical. This vulnerability affects the function rvu_mbox_init of the component octeontx2-af. The manipulation with an unknown input leads to a memory leak vulnerability. The CWE definition for the vulnerability is CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: octeontx2-af: Fix a memleak bug in rvu_mbox_init() In rvu_mbox_init(), mbox_regions is not freed or passed out under the switch-default region, which could lead to a memory leak. Fix this bug by changing 'return err' to 'goto free_regions'. 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_OCTEONTX2_AF=y show no new warnings, and our static analyzer no longer warns about this code.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2021-47537 since 05/24/2024. Technical details are known, but there is no available exploit.

Upgrading to version 5.15.7 eliminates this vulnerability. Applying the patch 1c0ddef45b7e/e07a097b4986 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.15.0
• 5.15.1
• 5.15.2
• 5.15.3
• 5.15.4
• 5.15.5
• 5.15.6

License

• open-source

Website

• Vendor: https://www.kernel.org/

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