Improper control of a resource through its lifetime in Linux kernel - CVE-2026-64104

Vulnerability details

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

The vulnerability exists due to improper handling of pages left in an unknown encryption state in drivers/virt/coco/sev-guest/sev-guest.c when handling extended report requests and memory encryption state transitions. A local user can trigger failures in set_memory_encrypted() or set_memory_decrypted() to cause a denial of service.

The issue affects pages that may remain in an unencrypted or otherwise unknown state and therefore cannot be safely returned for general reuse.

Affected software

How to mitigate CVE-2026-64104

External References

• https://git.kernel.org/stable/c/3d0cd0065deeb054b4b29236432e851806b7cc81
• https://git.kernel.org/stable/c/bee400ad4f4259c9c0758e4f1960a1eed6f6f9f0
• https://git.kernel.org/stable/c/fd948c3f96b18ff9ba7d3e8eae13d196593e1aaf

Related Security Bulletins

• Improper control of a resource through its lifetime in Linux kernel coco sev-guest driver
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia