Linux Kernel up to 5.4.134/5.10.52/5.13.4 cifs_compose_mount_options null pointer dereference

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 5.4.134/5.10.52/5.13.4. Affected is the function cifs_compose_mount_options. This manipulation causes null pointer dereference. This vulnerability is registered as CVE-2021-47307. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.4.134/5.10.52/5.13.4 and classified as critical. Affected by this vulnerability is the function cifs_compose_mount_options. 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. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: cifs: prevent NULL deref in cifs_compose_mount_options() The optional @ref parameter might contain an NULL node_name, so prevent dereferencing it in cifs_compose_mount_options(). Addresses-Coverity: 1476408 ("Explicit null dereferenced")

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2021-47307 since 05/21/2024. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.4.135, 5.10.53 or 5.13.5 eliminates this vulnerability. Applying the patch f7d1fa65e742/e58c162789be/ae3d181f4e91/03313d1c3a2f 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

• 5.4.134
• 5.10.0
• 5.10.1
• 5.10.2
• 5.10.3
• 5.10.4
• 5.10.5
• 5.10.6
• 5.10.7
• 5.10.8
• 5.10.9
• 5.10.10
• 5.10.11
• 5.10.12
• 5.10.13
• 5.10.14
• 5.10.15
• 5.10.16
• 5.10.17
• 5.10.18
• 5.10.19
• 5.10.20
• 5.10.21
• 5.10.22
• 5.10.23
• 5.10.24
• 5.10.25
• 5.10.26
• 5.10.27
• 5.10.28
• 5.10.29
• 5.10.30
• 5.10.31
• 5.10.32
• 5.10.33
• 5.10.34
• 5.10.35
• 5.10.36
• 5.10.37
• 5.10.38
• 5.10.39
• 5.10.40
• 5.10.41
• 5.10.42
• 5.10.43
• 5.10.44
• 5.10.45
• 5.10.46
• 5.10.47
• 5.10.48
• 5.10.49
• 5.10.50
• 5.10.51
• 5.10.52
• 5.13.0
• 5.13.1
• 5.13.2
• 5.13.3
• 5.13.4

License

• open-source

Website

• Vendor: https://www.kernel.org/

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