CVE-2026-64438

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()

The VF2PF interrupt handler queues PF-side response work that stores a

raw pointer to per-VF state (struct adf_accel_vf_info). Currently,

adf_disable_sriov() destroys per-VF mutexes and frees vf_info without

stopping new VF2PF work or waiting for in-flight workers to complete. A

concurrently scheduled or already queued worker can then dereference

freed memory.

This manifests as a use-after-free when KASAN is enabled:

BUG: KASAN: null-ptr-deref in mutex_lock+0x76/0xe0

Write of size 8 at addr 0000000000000260 by task kworker/24:2/...

Workqueue: qat_pf2vf_resp_wq adf_iov_send_resp [intel_qat]

Call Trace:

kasan_report+0x119/0x140

mutex_lock+0x76/0xe0

adf_gen4_pfvf_send+0xd4/0x1f0 [intel_qat]

adf_recv_and_handle_vf2pf_msg+0x290/0x360 [intel_qat]

adf_iov_send_resp+0x8c/0xe0 [intel_qat]

process_one_work+0x6ac/0xfd0

worker

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References