PT-2025-38197 · Linux+3 · Linux Kernel+3

Published 2023-03-20 · Updated 2026-04-20 · CVE-2023-53347

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the Linux kernel's net/mlx5 component related to the handling of E-switch pairing during uplink un/load APIs. Specifically, when transitioning a device from switchdev mode to legacy mode, the E-switch is unpaired before the uplink vport is unloaded. Conversely, during device removal or reload, the uplink vport is unloaded before the E-switch is unpaired. This sequence can lead to a kernel-oops when using VF LAG, where tc fdb flows are duplicated, and a pointer to the duplicated flow is maintained instead of the peer flow. During module unload, if the peer device is removed first, the peer net-dev is destroyed, leading to a null pointer dereference when attempting to unpair from the original device. The vulnerable function is mlx5e tc del fdb flow.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-664

CWE-476

Related Identifiers

AZL-71900

BDU:2026-03589

CVE-2023-53347

SUSE-SU-2025:03615-1

SUSE-SU-2025:3761-1

Affected Products

Debian

Linux Kernel

Suse

Mlx5

References · 838

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53347.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2023-53347 · Security Note
• https://cve.org/CVERecord?id=CVE-2023-53347 · Security Note
• https://osv.dev/vulnerability/CVE-2023-53347 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-53347 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-53347 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:03615-1 · Vendor Advisory
• https://git.kernel.org/stable/c/2be5bd42a5bba1a05daedc86cf0e248210009669 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2023-53347 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2023-53347 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2023-53347 · Vendor Advisory
• https://git.kernel.org/stable/c/b17294e7aa8c39dbb9c3e28e2d1983c88b94b387 · Patch
• https://osv.dev/vulnerability/AZL-71900 · Vendor Advisory
• https://git.kernel.org/stable/c/10cbfecc0f99f579fb170feee866c9efaab7ee47 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2025:3761-1 · Vendor Advisory