CVE-2023-23454 Memory corruption in n/a

Medium 5.5 Published 12 Jan 2023 Updated 14 Oct 2026

Attackers can cause a denial of service via a slab-out-of-bounds read in the Linux kernel's CBQ scheduler due to type confusion.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2023-23454?

CVE-2023-23454 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 12 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

cbq_classify in net/sched/sch_cbq.c in the Linux kernel through 6.1.4 allows attackers to cause a denial of service (slab-out-of-bounds read) because of type confusion (non-negative numbers can sometimes indicate a TC_ACT_SHOT condition rather than valid classification results).

Weakness: CWE-843

Which versions are affected by CVE-2023-23454?

It affects 2 products.

Linux distribution packages (5)

`kernel-livepatch-SLE15-SP1_Update_40` SUSE:Linux Enterprise Live Patching 15 SP1	All versions	`2-150100.2.2`
`kernel-livepatch-SLE15-SP2_Update_36` SUSE:Linux Enterprise Live Patching 15 SP2	All versions	`2-150200.2.3`
`kernel-livepatch-SLE15-SP3_Update_32` SUSE:Linux Enterprise Live Patching 15 SP3	All versions	`2-150300.2.3`
`kernel-livepatch-SLE15-SP4-RT_Update_7` SUSE:Linux Enterprise Live Patching 15 SP4	All versions	`2-150400.2.2`
`kernel-livepatch-SLE15-SP4_Update_12` SUSE:Linux Enterprise Live Patching 15 SP4	All versions	`2-150400.2.3`

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2023-23454?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-23454 being exploited?

There is no known exploitation of CVE-2023-23454 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as AZL-13006, AZL-13049, DEBIAN-CVE-2023-23454, GHSA-wmg2-2x6g-r8q6, SUSE-SU-2023:2367-1, SUSE-SU-2023:2385-1 and 4 more.