SB2026080628 - Out-of-bounds write in Linux kernel xfrm

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-64566)

CWE-ID: CWE-787 - Out-of-bounds write

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 user to cause a denial of service.

The vulnerability exists due to memory corruption in iptfs_skb_add_frags() when processing shared fragment references for nested transport-mode SA traffic. A local user can trigger crafted packet processing to cause a denial of service.

The issue can lead to kernel-visible memory corruption and a kernel panic when ESP decrypts in place on fragments still referenced by the outer IPTFS SKB.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/430ea57d6daf765e88f90046afbfd1e071cb7200
• https://git.kernel.org/stable/c/d8aaf06b29f5a0b6186cf68d21c7d63678ee3891
• https://git.kernel.org/stable/c/ffd64e0717efd83fbf3396ab4e5ac6d795dac4d0