CVE-2023-1583 Null dereference in Linux kernel

What is CVE-2023-1583?

CVE-2023-1583 is a medium-severity vulnerability in Linux kernel, published on 24 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-476

Which versions are affected by CVE-2023-1583?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-1583?

Apply the vendor's patch.

Is CVE-2023-1583 being exploited?

There is no known exploitation of CVE-2023-1583 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2023-1583, GHSA-p732-x236-jpq6, UBUNTU-CVE-2023-1583.