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Advisory severityHigh7.0Vendor: MediumRed Hat Linux

High [CVE-2026-64438] qat - fix VF2PF work teardown race in adf_disable_sriov

This high-severity Red Hat Linux advisory covers CVE-2026-64438 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.6 Extended Update Support.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-64438 Source published Source updated

VulniPulse record published Record updated

CVE-2026-64438
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

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().

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.50.1.el10_2
  • kernel-0:6.12.0-55.108.1.el10_0
  • kernel-0:5.14.0-687.44.1.el9_8
  • kernel-0:5.14.0-427.150.1.el9_4
  • kernel-0:5.14.0-570.141.1.el9_6
  • RHSA-2026:61887
  • RHSA-2026:75560
  • RHSA-2026:63129
  • RHSA-2026:68100
  • RHSA-2026:67720

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Mitigation

Upgrade to a fixed release: kernel-0:6.12.0-211.50.1.el10_2, kernel-0:6.12.0-55.108.1.el10_0, kernel-0:5.14.0-687.44.1.el9_8, kernel-0:5.14.0-427.150.1.el9_4, kernel-0:5.14.0-570.141.1.el9_6, RHSA-2026:61887. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

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