High 8.8Published Jul 25, 2026

CVE-2026-64438crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()

Updated under an hour ago (Oct 26, 2026, 9:23 PM ET)

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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.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ed8ccaef52fa03fb03cff45b380f72c9f869f273 before 218c2836b3987f3fa1d9eac505462cded0821e4c; from ed8ccaef52fa03fb03cff45b380f72c9f869f273 before 446b4d77599cf1a168573f7fb32a4a6aa4f09219; from ed8ccaef52fa03fb03cff45b380f72c9f869f273 before 5d916c1eae1933511a69bffe243b4ee5d7da399c; from ed8ccaef52fa03fb03cff45b380f72c9f869f273 before f344a369d0380d54c8d6c8d24734a78dd5a89817; from ed8ccaef52fa03fb03cff45b380f72c9f869f273 before 51144032248cc4ea22917370565650670b8b4e9b; from ed8ccaef52fa03fb03cff45b380f72c9f869f273 before 49cd5ac6de8de39a14ead609bb552d372d5602cd; from ed8ccaef52fa03fb03cff45b380f72c9f869f273 before 6e92b28cd74fa433658efeadf21b9d4b01023d7d; from ed8ccaef52fa03fb03cff45b380f72c9f869f273 before 277281c10c63791067d24d421f7c43a15faa9096	CNA record
linux linux_kernel linux:linux_kernel	from 4.3 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.97; from 6.13 before 6.18.40; from 6.19 before 7.1.4	NVD

References

References

https://git.kernel.org/stable/c/218c2836b3987f3fa1d9eac505462cded0821e4c	patch
https://git.kernel.org/stable/c/446b4d77599cf1a168573f7fb32a4a6aa4f09219	patch
https://git.kernel.org/stable/c/5d916c1eae1933511a69bffe243b4ee5d7da399c	patch
https://git.kernel.org/stable/c/f344a369d0380d54c8d6c8d24734a78dd5a89817	patch
https://git.kernel.org/stable/c/51144032248cc4ea22917370565650670b8b4e9b	patch
https://git.kernel.org/stable/c/49cd5ac6de8de39a14ead609bb552d372d5602cd	patch
https://git.kernel.org/stable/c/6e92b28cd74fa433658efeadf21b9d4b01023d7d	patch
https://git.kernel.org/stable/c/277281c10c63791067d24d421f7c43a15faa9096	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.