Linux Kernel up to 6.10.6 SMB Client cifs_free_subrequest null pointer dereference

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.10.6. This affects the function cifs_free_subrequest of the component SMB Client. The manipulation leads to null pointer dereference. This vulnerability is documented as CVE-2024-44992. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.10.6. This issue affects the function cifs_free_subrequest of the component SMB Client. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: smb/client: avoid possible NULL dereference in cifs_free_subrequest() Clang static checker (scan-build) warning: cifsglob.h:line 890, column 3 Access to field 'ops' results in a dereference of a null pointer. Commit 519be989717c ("cifs: Add a tracepoint to track credits involved in R/W requests") adds a check for 'rdata->server', and let clang throw this warning about NULL dereference. When 'rdata->credits.value != 0 && rdata->server == NULL' happens, add_credits_and_wake_if() will call rdata->server->ops->add_credits(). This will cause NULL dereference problem. Add a check for 'rdata->server' to avoid NULL dereference.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2024-44992 since 08/21/2024. The exploitation is known to be difficult. Technical details are known, but no exploit is available.

Upgrading to version 6.10.7 eliminates this vulnerability. Applying the patch fead60a6d5f8/74c2ab6d653b 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

• 6.10.0
• 6.10.1
• 6.10.2
• 6.10.3
• 6.10.4
• 6.10.5
• 6.10.6

License

• open-source

Website

• Vendor: https://www.kernel.org/

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