SB2026100704 - Use-after-free in Linux kernel xfrm
Published: October 7, 2026
Security Bulletin ID
SB2026100704
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-98364)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/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_bundle_create() and xfrm_create_dummy_bundle() when creating XFRM bundles concurrently with network device removal. A local user can race bundle creation against an RTM_DELLINK operation to trigger a use-after-free in the kernel.
The reported invalid read occurs in xfrm6_fill_dst() during an IPv6 UDP send operation.
Remediation
Install update from vendor's website.