SB2026062696 - Use-after-free in Linux kernel xfrm

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-53240)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to a use-after-free in __input_process_payload() in the xfrm iptfs implementation when processing packet reassembly state concurrently. A local user can trigger concurrent reassembly handling to cause a denial of service.

The issue arises from a race condition involving concurrent execution of iptfs_reassem_cont() or the drop_timer hrtimer during partial reassembly.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/8d9a79fbf5172d9c4c0146057af2360913265a11
• https://git.kernel.org/stable/c/eb48730bb827d1550401a5d391903f9d90b493c8
• https://git.kernel.org/stable/c/ff2ee35b6ce5fa8a8e24ea50b15733d5c8780198