CVE-2023-1583: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 5.19, before 6.1.22 (fixed in 6.1.22); from 6.2.0, before 6.2.9 (fixed in 6.2.9)

Published 2023-03-24. Last modified 2026-06-17.