SB20260720163 - Use-after-free in Linux kernel nvme host driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-64071)

CWE-ID: CWE-416 - Use After Free

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 use-after-free in nvme_free_host_mem() when handling an error path during nvme_probe(). A local user can trigger repeated cleanup of host memory state to cause a denial of service.

This occurs when host memory buffer setup succeeds but a subsequent I/O error causes nvme_free_host_mem() to be invoked twice, leading to a kernel NULL pointer dereference. The issue was reproducible on Thunderbolt-attached NVMe devices with intermittent PCIe link instability.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/7c89f474005d8377525d2991930b7432ee193a52
• https://git.kernel.org/stable/c/9525e3a6fbb1d126a22ab2ee86ddea25af581a7c
• https://git.kernel.org/stable/c/b35a13036755c5803168a7cb93bc66035c3e65b8