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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64438
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:28 UTC
Updated2026-07-25 10:17:28 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002200000 probability, percentile 0.125960000 (date 2026-07-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 218c2836b3987f3fa1d9eac505462cded0821e4c git Not specified
CNA Linux Linux affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 446b4d77599cf1a168573f7fb32a4a6aa4f09219 git Not specified
CNA Linux Linux affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 5d916c1eae1933511a69bffe243b4ee5d7da399c git Not specified
CNA Linux Linux affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 f344a369d0380d54c8d6c8d24734a78dd5a89817 git Not specified
CNA Linux Linux affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 51144032248cc4ea22917370565650670b8b4e9b git Not specified
CNA Linux Linux affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 49cd5ac6de8de39a14ead609bb552d372d5602cd git Not specified
CNA Linux Linux affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 6e92b28cd74fa433658efeadf21b9d4b01023d7d git Not specified
CNA Linux Linux affected ed8ccaef52fa03fb03cff45b380f72c9f869f273 277281c10c63791067d24d421f7c43a15faa9096 git Not specified
CNA Linux Linux affected 4.3 Not specified
CNA Linux Linux unaffected 4.3 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5d916c1eae1933511a69bffe243b4ee5d7da399c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f344a369d0380d54c8d6c8d24734a78dd5a89817 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e92b28cd74fa433658efeadf21b9d4b01023d7d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/446b4d77599cf1a168573f7fb32a4a6aa4f09219 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/51144032248cc4ea22917370565650670b8b4e9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/218c2836b3987f3fa1d9eac505462cded0821e4c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/49cd5ac6de8de39a14ead609bb552d372d5602cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/277281c10c63791067d24d421f7c43a15faa9096 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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