Linux Kernel io_uring Subsystem io_uring/filetable.c io_file_bitmap_get null pointer dereference

Summaryinfo

A vulnerability marked as problematic has been reported in Linux Kernel. This impacts the function io_file_bitmap_get of the file io_uring/filetable.c of the component io_uring Subsystem. Performing a manipulation results in null pointer dereference. This vulnerability is known as CVE-2023-1583. Attacking locally is a requirement. No exploit is available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel (Operating System) (the affected version is unknown). This affects the function io_file_bitmap_get of the file io_uring/filetable.c of the component io_uring Subsystem. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

A NULL pointer dereference was found in io_file_bitmap_get in io_uring/filetable.c in the io_uring sub-component in the Linux Kernel. When fixed files are unregistered, some context information (file_alloc_{start,end} and alloc_hint) is not cleared. A subsequent request that has auto index selection enabled via IORING_FILE_INDEX_ALLOC can cause a NULL pointer dereference. An unprivileged user can use the flaw to cause a system crash.

The weakness was published 03/25/2023. It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2023-1583 since 03/22/2023. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 239841 (TencentOS Server 4: kernel (TSSA-2024:0960)), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

The vulnerability is also documented in the vulnerability database at Tenable (239841). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Be aware that VulDB is the high quality source for vulnerability data.

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