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CVE-2023-1583

MEDIUM
5.5
CVSS Score
Published: March 24, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 05:28 AM UTC
2 products affected across 2 vendorsLinux KernelKernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.19 ≤ v < 6.1.226.2.0 ≤ v < 6.2.9
Affected range stops below 6.1.22, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.2.9, so it looks safe — our inference, not a vendor statement
Kernel· Red Hat
60%
affected kernel 5.19, 6.0, 6.1, 6.2, 6.3

References (2)

Mailing ListPatch
Source: [email protected]
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=02a4d923e4400a36d340ea12d8058f69ebf3a383
Mailing ListPatch
Source: [email protected]
https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?h=io_uring-6.3&id=761efd55a0227aca3a69deacdaa112fffd44fe37

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-476

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