Linux Kernel up to 6.10.7 nfsd4_deleg_getattr_conflict null pointer dereference

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.10.7. Affected by this issue is the function nfsd4_deleg_getattr_conflict. Executing a manipulation can lead to null pointer dereference. This vulnerability is handled as CVE-2024-46690. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.10.7 and classified as critical. This vulnerability affects the function nfsd4_deleg_getattr_conflict. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix nfsd4_deleg_getattr_conflict in presence of third party lease It is not safe to dereference fl->c.flc_owner without first confirming fl->fl_lmops is the expected manager. nfsd4_deleg_getattr_conflict() tests fl_lmops but largely ignores the result and assumes that flc_owner is an nfs4_delegation anyway. This is wrong. With this patch we restore the "!= &nfsd_lease_mng_ops" case to behave as it did before the change mentioned below. This is the same as the current code, but without any reference to a possible delegation.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2024-46690 since 09/11/2024. Technical details are known, but there is no available exploit.

Upgrading to version 6.10.8 eliminates this vulnerability. Applying the patch 1b46a871e980/40927f3d0972 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
• 6.10.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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