SB20260812259 - Race condition in Linux kernel core

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-68286)

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

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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

The vulnerability exists due to a race condition in net_dm_packet_trace_kfree_skb_hit() and net_dm_hw_trap_packet_probe() in net/core/drop_monitor.c when updating 64-bit per-CPU statistics after releasing drop_queue.lock with interrupts re-enabled. A local attacker can trigger reentrant execution during the stats update to cause a denial of service.

On 32-bit architectures, a nested interrupt on the same CPU during the seqcount-based update can corrupt the seqcount state or statistics value.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/d5e2cd2bc8ae36617346b3a54ee9da61d866bf92
• https://git.kernel.org/stable/c/fd098a23bf8fda7eae48db9b06e7c34fc4d228fa