{
  "threat_severity" : "Moderate",
  "public_date" : "2026-07-25T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: crypto: qat - fix VF2PF work teardown race in adf_disable_sriov()",
    "id" : "2507118",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2507118"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.0",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-825",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\ncrypto: qat - fix VF2PF work teardown race in adf_disable_sriov()\nThe VF2PF interrupt handler queues PF-side response work that stores a\nraw pointer to per-VF state (struct adf_accel_vf_info). Currently,\nadf_disable_sriov() destroys per-VF mutexes and frees vf_info without\nstopping new VF2PF work or waiting for in-flight workers to complete. A\nconcurrently scheduled or already queued worker can then dereference\nfreed memory.\nThis manifests as a use-after-free when KASAN is enabled:\nBUG: KASAN: null-ptr-deref in mutex_lock+0x76/0xe0\nWrite of size 8 at addr 0000000000000260 by task kworker/24:2/...\nWorkqueue: qat_pf2vf_resp_wq adf_iov_send_resp [intel_qat]\nCall Trace:\nkasan_report+0x119/0x140\nmutex_lock+0x76/0xe0\nadf_gen4_pfvf_send+0xd4/0x1f0 [intel_qat]\nadf_recv_and_handle_vf2pf_msg+0x290/0x360 [intel_qat]\nadf_iov_send_resp+0x8c/0xe0 [intel_qat]\nprocess_one_work+0x6ac/0xfd0\nworker_thread+0x4dd/0xd30\nkthread+0x326/0x410\nret_from_fork+0x33b/0x670\nAdd a PF-local flag, vf2pf_disabled, that gates work queueing, worker\nprocessing, and interrupt re-enabling during teardown. Set this flag\natomically with the hardware interrupt mask inside\nadf_disable_all_vf2pf_interrupts(). After masking, synchronize the AE\ncluster MSI-X interrupt and flush the PF response workqueue before\ntearing down per-VF locks and state so all in-flight work completes\nbefore vf_info is destroyed.\nIntroduce adf_enable_all_vf2pf_interrupts() to clear the flag and\nunmask all VF2PF interrupts under the same lock when SR-IOV is\nre-enabled. This ensures the software flag and hardware state transition\natomically on both the enable and disable paths.", "A flaw was found in the Linux kernel's crypto QAT (QuickAssist Technology) module. A race condition exists during the teardown of Virtual Function to Physical Function (VF2PF) work in the `adf_disable_sriov()` function. This allows a concurrently scheduled or already queued worker to attempt to access memory that has already been freed, leading to a use-after-free vulnerability. This can result in a null-pointer dereference, potentially causing system instability or crashes." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-09-01T00:00:00Z",
    "advisory" : "RHSA-2026:61887",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "kernel-0:6.12.0-211.50.1.el10_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-09-04T00:00:00Z",
    "advisory" : "RHSA-2026:63129",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.44.1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-09-04T00:00:00Z",
    "advisory" : "RHSA-2026:63129",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.44.1.el9_8"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "erlang27",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "impact" : "moderate"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-64438\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64438\nhttps://lore.kernel.org/linux-cve-announce/2026072538-CVE-2026-64438-13b5@gregkh/T" ],
  "name" : "CVE-2026-64438",
  "csaw" : false
}