CVE-2023-2598: A flaw was found in the fixed buffer registration code for io_uring (io_sqe_buffer_register in io_uring/rsrc.c

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HIGH 7.8WATCHLISTUPGRADEDOWNGRADE

CVE-2023-2598 is a high-severity flaw (CVSS 7.8) affecting linux kernel, hci baseboard management controller. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in the fixed buffer registration code for io_uring (io_sqe_buffer_register in io_uring/rsrc.c) in the Linux kernel that allows out-of-bounds access to physical memory beyond the end of the buffer. This flaw enables full local privilege escalation.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-416, CWE-787
Published	2023-06-01
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: linux · netapp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-06-01 01:15 UTCPublished CVE record published
2026-06-17 05:52 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 6.3 and < 6.3.2

Fixed in: 6.3.2

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

netapp hci baseboard management controller DOWNGRADE

Affected: h300s · h410c · h410s · h500s · h700s

Fixed in: no fixed release known

Safe to downgrade to: a release before h300s

1. Check installed version

apt-cache policy hci-baseboard-management-controller || rpm -q hci-baseboard-management-controller || hci-baseboard-management-controller --version

2. No fixed release: DOWNGRADE to a release before h300s (Debian / Ubuntu)

apt-cache madison hci-baseboard-management-controller sudo apt install hci-baseboard-management-controller=<VERSION_BEFORE_h300s> sudo apt-mark hold hci-baseboard-management-controller

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list hci-baseboard-management-controller sudo dnf downgrade hci-baseboard-management-controller-<VERSION_BEFORE_h300s> sudo dnf versionlock add hci-baseboard-management-controller

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-2598?

linux kernel: upgrade to 6.3.2; hci baseboard management controller: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-2598 being exploited?

CVE-2023-2598 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-2598 affect?

CVE-2023-2598 affects linux kernel, hci baseboard management controller. Severity is high (CVSS 7.8). A flaw was found in the fixed buffer registration code for io_uring (io_sqe_buffer_register in io_uring/rsrc.c) in the Linux kernel that allows out-of-bounds access to physical memory beyond the end of the buffer. This flaw enables full loc

How urgent is CVE-2023-2598?

Priority 50/100. High severity; On your watchlist

Software pages

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References

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