SB2026100667 - Use-after-free in Linux kernel xfrm

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Main Vulnerability Database SB2026100667

SB2026100667 - Use-after-free in Linux kernel xfrm

Published: October 6, 2026

Security Bulletin ID SB2026100667
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-98370)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to trigger a use-after-free in the kernel.

The vulnerability exists due to use-after-free in xfrm_alloc_userspi() and xfrm_user_rcv_msg() when processing compat ALLOCSPI requests. A local user can submit a compat ALLOCSPI request that causes a translated child buffer to be attached to the inbound request to trigger a use-after-free in the kernel.

Exploitation depends on a multicast clone sharing skb_shared_info with the request and a compat receiver still copying from the translated child when the request handler frees it.


Remediation

Install update from vendor's website.

References