SB20261022414 - Race condition in Linux kernel core

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-98801)

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

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to corrupt socket memory accounting and potentially cause a denial of service.

The vulnerability exists due to improper synchronization in the Linux kernel's UDP socket memory reservation handling when processing SO_RESERVE_MEM operations concurrently with packet reception or release. A local user can invoke setsockopt(SO_RESERVE_MEM) on a UDP socket during these operations to corrupt sk_forward_alloc and memory control group accounting, potentially disrupting memory management and system availability.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/37e02c42a00be692c06343e11779aadc45f45971
• https://git.kernel.org/stable/c/492e04f9a00f3cc88a1f6899417b10f3019a624e
• https://git.kernel.org/stable/c/5069ce898148bd799395c5a464e006cbb840f188
• https://git.kernel.org/stable/c/a467b05b201b5c26be52ed3081992fa9c0387648