Answer in brief
CVE-2026-64438 records a High severity (CVSS 8.8) vulnerability in crypto: qat - fix VF2PF work teardown race in adf_disable_sriov(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <218c2836b3987f3fa1d9eac505462cded0821e4c || >=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <446b4d77599cf1a168573f7fb32a4a6aa4f09219 || >=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <5d916c1eae1933511a69bffe243b4ee5d7da399c || >=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <f344a369d0380d54c8d6c8d24734a78dd5a89817 || >=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <51144032248cc4ea22917370565650670b8b4e9b || >=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <49cd5ac6de8de39a14ead609bb552d372d5602cd || >=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <6e92b28cd74fa433658efeadf21b9d4b01023d7d || >=ed8ccaef52fa03fb03cff45b380f72c9f869f273 <277281c10c63791067d24d421f7c43a15faa9096 | 218c2836b3987f3fa1d9eac505462cded0821e4c, 446b4d77599cf1a168573f7fb32a4a6aa4f09219, 5d916c1eae1933511a69bffe243b4ee5d7da399c, f344a369d0380d54c8d6c8d24734a78dd5a89817, 51144032248cc4ea22917370565650670b8b4e9b, 49cd5ac6de8de39a14ead609bb552d372d5602cd, 6e92b28cd74fa433658efeadf21b9d4b01023d7d, 277281c10c63791067d24d421f7c43a15faa9096 |
| Linux/Linuxgeneric | 4.3 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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_thread+0x4dd/0xd30 kthread+0x326/0x410 ret_from_fork+0x33b/0x670 Add a PF-local flag, vf2pf_disabled, that gates work queueing, worker processing, and interrupt re-enabling during teardown. Set this flag atomically with the hardware interrupt mask inside adf_disable_all_vf2pf_interrupts(). After masking, synchronize the AE cluster MSI-X interrupt and flush the PF response workqueue before tearing down per-VF locks and state so all in-flight work completes before vf_info is destroyed. Introduce adf_enable_all_vf2pf_interrupts() to clear the flag and unmask all VF2PF interrupts under the same lock when SR-IOV is re-enabled. This ensures the software flag and hardware state transition atomically on both the enable and disable paths.
Quoted source text, attributed separately from HOL analysis.