{"id":"DEBIAN-CVE-2026-64438","details":"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.","modified":"2026-09-04T08:47:32.354688785Z","published":"2026-07-25T10:17:28.303Z","upstream":["CVE-2026-64438"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-64438"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.180-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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