Red Hat Enterprise Linux 7/8/9/10 Filesystem Label bd_fs_ntfs_set_label/bd_fs_vfat_set_label os command injection

Summaryinfo

A vulnerability was found in Red Hat Enterprise Linux 7/8/9/10. It has been classified as very critical. Affected is the function bd_fs_ntfs_set_label/bd_fs_vfat_set_label of the component Filesystem Label Handler. This manipulation of the argument label causes os command injection. This vulnerability is handled as CVE-2026-111581. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Red Hat Enterprise Linux 7/8/9/10 and classified as very critical. Affected by this vulnerability is the function bd_fs_ntfs_set_label/bd_fs_vfat_set_label of the component Filesystem Label Handler. The manipulation of the argument label with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in libblockdev. The bd_fs_ntfs_set_label() and bd_fs_vfat_set_label() functions pass caller-supplied label values as bare positional arguments to the ntfslabel and fatlabel utilities without end-of-options separators or input validation for values beginning with a dash. This allows a label starting with '-' to be interpreted as a command-line flag by the spawned tool, potentially bypassing safety checks or causing unintended operations. This is reachable by unprivileged local users through the udisks2 Filesystem.SetLabel() D-Bus method without administrator authentication.

The advisory is shared at access.redhat.com. This vulnerability is known as CVE-2026-111581 since 10/16/2026. The exploitation appears to be easy. An attack has to be approached locally. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/16/2026). MITRE ATT&CK project uses the attack technique T1202 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux

Version

• 7
• 8
• 9
• 10

License

• commercial

Website

• Vendor: https://www.redhat.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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