CVE-2023-53034 ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans

What is CVE-2023-53034?

CVE-2023-53034 is a high-severity vulnerability in Linux kernel, published on 16 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans

There is a kernel API ntb_mw_clear_trans() would pass 0 to both addr and size. This would make xlate_pos negative.

[ 23.734156] switchtec switchtec0: MW 0: part 0 addr 0x0000000000000000 size 0x0000000000000000 [ 23.734158] ================================================================================ [ 23.734172] UBSAN: shift-out-of-bounds in drivers/ntb/hw/mscc/ntb_hw_switchtec.c:293:7 [ 23.734418] shift exponent -1 is negative

Ensuring xlate_pos is a positive or zero before BIT.

Weakness: CWE-125

Which versions are affected by CVE-2023-53034?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-53034?

Apply the vendor's patch.

Is CVE-2023-53034 being exploited?

There is no known exploitation of CVE-2023-53034 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 BELL-CVE-2023-53034, DEBIAN-CVE-2023-53034, GHSA-xph3-px55-p2mg, ROOT-OS-UBUNTU-2404-CVE-2023-53034, UBUNTU-CVE-2023-53034.