CVE-2026-64522

kernel: net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · July 25, 2026

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel's mlx5e network driver. When handling temporary Security Associations (SAs) for IPsec, the mlx5e_xfrm_add_state() function incorrectly decrements a counter without a corresponding increment. This underflow in the eswitch mode block mechanism can lead to a denial of service, potentially disrupting network operations.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-191 · Integer Underflow (Wrap or Wraparound)