SB20260928155 - Race condition in Linux kernel mellanox mlxsw driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-98050)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 7.7 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a race condition in the mlxsw Spectrum PTP packet-finish ingress-delivery path when processing unmatched PTP entries concurrently with NAPI polling. A remote attacker can exploit the race condition to cause a denial of service.

Exploitation requires a transmit-timestamp timeout to produce an unmatched entry while the owning NAPI thread is polling on another CPU.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2ac174dfcdde399fa95ba889541fb5e688d8bb35
• https://git.kernel.org/stable/c/4375b3d1c2898886df1f908160c7004bdd938e73
• https://git.kernel.org/stable/c/7ddcc460176eb34f9bc5bda3cc274d0d24dc62a9