{
  "threat_severity" : "Moderate",
  "public_date" : "2026-05-08T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: Bluetooth: hci_sync: Fix UAF in le_read_features_complete",
    "id" : "2468131",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2468131"
  },
  "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:\nBluetooth: hci_sync: Fix UAF in le_read_features_complete\nThis fixes the following backtrace caused by hci_conn being freed\nbefore le_read_features_complete but after\nhci_le_read_remote_features_sync so hci_conn_del -> hci_cmd_sync_dequeue\nis not able to prevent it:\n==================================================================\nBUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline]\nBUG: KASAN: slab-use-after-free in atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1383 [inline]\nBUG: KASAN: slab-use-after-free in hci_conn_drop include/net/bluetooth/hci_core.h:1688 [inline]\nBUG: KASAN: slab-use-after-free in le_read_features_complete+0x5b/0x340 net/bluetooth/hci_sync.c:7344\nWrite of size 4 at addr ffff8880796b0010 by task kworker/u9:0/52\nCPU: 0 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\nWorkqueue: hci0 hci_cmd_sync_work\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:94 [inline]\ndump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\nprint_address_description mm/kasan/report.c:378 [inline]\nprint_report+0xcd/0x630 mm/kasan/report.c:482\nkasan_report+0xe0/0x110 mm/kasan/report.c:595\ncheck_region_inline mm/kasan/generic.c:194 [inline]\nkasan_check_range+0x100/0x1b0 mm/kasan/generic.c:200\ninstrument_atomic_read_write include/linux/instrumented.h:96 [inline]\natomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1383 [inline]\nhci_conn_drop include/net/bluetooth/hci_core.h:1688 [inline]\nle_read_features_complete+0x5b/0x340 net/bluetooth/hci_sync.c:7344\nhci_cmd_sync_work+0x1ff/0x430 net/bluetooth/hci_sync.c:334\nprocess_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257\nprocess_scheduled_works kernel/workqueue.c:3340 [inline]\nworker_thread+0x6c8/0xf10 kernel/workqueue.c:3421\nkthread+0x3c5/0x780 kernel/kthread.c:463\nret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158\nret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\n</TASK>\nAllocated by task 5932:\nkasan_save_stack+0x33/0x60 mm/kasan/common.c:56\nkasan_save_track+0x14/0x30 mm/kasan/common.c:77\npoison_kmalloc_redzone mm/kasan/common.c:400 [inline]\n__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417\nkmalloc_noprof include/linux/slab.h:957 [inline]\nkzalloc_noprof include/linux/slab.h:1094 [inline]\n__hci_conn_add+0xf8/0x1c70 net/bluetooth/hci_conn.c:963\nhci_conn_add_unset+0x76/0x100 net/bluetooth/hci_conn.c:1084\nle_conn_complete_evt+0x639/0x1f20 net/bluetooth/hci_event.c:5714\nhci_le_enh_conn_complete_evt+0x23d/0x380 net/bluetooth/hci_event.c:5861\nhci_le_meta_evt+0x357/0x5e0 net/bluetooth/hci_event.c:7408\nhci_event_func net/bluetooth/hci_event.c:7716 [inline]\nhci_event_packet+0x685/0x11c0 net/bluetooth/hci_event.c:7773\nhci_rx_work+0x2c9/0xeb0 net/bluetooth/hci_core.c:4076\nprocess_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257\nprocess_scheduled_works kernel/workqueue.c:3340 [inline]\nworker_thread+0x6c8/0xf10 kernel/workqueue.c:3421\nkthread+0x3c5/0x780 kernel/kthread.c:463\nret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158\nret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\nFreed by task 5932:\nkasan_save_stack+0x33/0x60 mm/kasan/common.c:56\nkasan_save_track+0x14/0x30 mm/kasan/common.c:77\n__kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587\nkasan_save_free_info mm/kasan/kasan.h:406 [inline]\npoison_slab_object mm/kasan/common.c:252 [inline]\n__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284\nkasan_slab_free include/linux/kasan.h:234 [inline]\nslab_free_hook mm/slub.c:2540 [inline]\nslab_free mm/slub.c:6663 [inline]\nkfree+0x2f8/0x6e0 mm/slub.c:6871\ndevice_release+0xa4/0x240 drivers/base/core.c:2565\nkobject_cleanup lib/kobject.c:689 [inline]\nkobject_release lib/kobject.c:720 [inline]\nkref_put include/linux/kref.h:65 [inline]\nkobject_put+0x1e7/0x590 lib/kobject.\n---truncated---", "A flaw was found in the Bluetooth Host Controller Interface (HCI) synchronization module (`hci_sync`) of the Linux kernel. A use-after-free (UAF) vulnerability exists in the `le_read_features_complete` function, where a freed `hci_conn` object is accessed. This can allow an attacker to cause a system crash, leading to a denial of service." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-06-04T00:00:00Z",
    "advisory" : "RHSA-2026:23329",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "kernel-0:6.12.0-211.20.1.el10_2"
  } ],
  "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" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-43322\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43322\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-43322.mbox" ],
  "name" : "CVE-2026-43322",
  "csaw" : false
}