Out-of-bounds write in Linux kernel - CVE-2026-64566
Published: August 6, 2026
Vulnerability identifier: #VU141042
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-64566
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
Ubuntu
linux-gcp-7.0 (Ubuntu package)
Ubuntu
linux-gcp-7.0 (Ubuntu package)
How to mitigate CVE-2026-64566
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1