GHSA-8Q8R-PQGC-3HJC

Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-11 09:30
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sync: Fix UAF in le_read_features_complete

This fixes the following backtrace caused by hci_conn being freed before le_read_features_complete but after hci_le_read_remote_features_sync so hci_conn_del -> hci_cmd_sync_dequeue is not able to prevent it:

================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1383 [inline] BUG: KASAN: slab-use-after-free in hci_conn_drop include/net/bluetooth/hci_core.h:1688 [inline] BUG: KASAN: slab-use-after-free in le_read_features_complete+0x5b/0x340 net/bluetooth/hci_sync.c:7344 Write of size 4 at addr ffff8880796b0010 by task kworker/u9:0/52

CPU: 0 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: hci0 hci_cmd_sync_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:194 [inline] kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:200 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1383 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1688 [inline] le_read_features_complete+0x5b/0x340 net/bluetooth/hci_sync.c:7344 hci_cmd_sync_work+0x1ff/0x430 net/bluetooth/hci_sync.c:334 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

Allocated by task 5932: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] __hci_conn_add+0xf8/0x1c70 net/bluetooth/hci_conn.c:963 hci_conn_add_unset+0x76/0x100 net/bluetooth/hci_conn.c:1084 le_conn_complete_evt+0x639/0x1f20 net/bluetooth/hci_event.c:5714 hci_le_enh_conn_complete_evt+0x23d/0x380 net/bluetooth/hci_event.c:5861 hci_le_meta_evt+0x357/0x5e0 net/bluetooth/hci_event.c:7408 hci_event_func net/bluetooth/hci_event.c:7716 [inline] hci_event_packet+0x685/0x11c0 net/bluetooth/hci_event.c:7773 hci_rx_work+0x2c9/0xeb0 net/bluetooth/hci_core.c:4076 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

Freed by task 5932: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 __kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6663 [inline] kfree+0x2f8/0x6e0 mm/slub.c:6871 device_release+0xa4/0x240 drivers/base/core.c:2565 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1e7/0x590 lib/kobject. ---truncated---

Severity ?
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43322"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-08T14:16:40Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Fix UAF in le_read_features_complete\n\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 -\u003e hci_cmd_sync_dequeue\nis not able to prevent it:\n\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\n\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 \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xcd/0x630 mm/kasan/report.c:482\n kasan_report+0xe0/0x110 mm/kasan/report.c:595\n check_region_inline mm/kasan/generic.c:194 [inline]\n kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:200\n instrument_atomic_read_write include/linux/instrumented.h:96 [inline]\n atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1383 [inline]\n hci_conn_drop include/net/bluetooth/hci_core.h:1688 [inline]\n le_read_features_complete+0x5b/0x340 net/bluetooth/hci_sync.c:7344\n hci_cmd_sync_work+0x1ff/0x430 net/bluetooth/hci_sync.c:334\n process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257\n process_scheduled_works kernel/workqueue.c:3340 [inline]\n worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421\n kthread+0x3c5/0x780 kernel/kthread.c:463\n ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\n \u003c/TASK\u003e\n\nAllocated by task 5932:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:56\n kasan_save_track+0x14/0x30 mm/kasan/common.c:77\n poison_kmalloc_redzone mm/kasan/common.c:400 [inline]\n __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417\n kmalloc_noprof include/linux/slab.h:957 [inline]\n kzalloc_noprof include/linux/slab.h:1094 [inline]\n __hci_conn_add+0xf8/0x1c70 net/bluetooth/hci_conn.c:963\n hci_conn_add_unset+0x76/0x100 net/bluetooth/hci_conn.c:1084\n le_conn_complete_evt+0x639/0x1f20 net/bluetooth/hci_event.c:5714\n hci_le_enh_conn_complete_evt+0x23d/0x380 net/bluetooth/hci_event.c:5861\n hci_le_meta_evt+0x357/0x5e0 net/bluetooth/hci_event.c:7408\n hci_event_func net/bluetooth/hci_event.c:7716 [inline]\n hci_event_packet+0x685/0x11c0 net/bluetooth/hci_event.c:7773\n hci_rx_work+0x2c9/0xeb0 net/bluetooth/hci_core.c:4076\n process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257\n process_scheduled_works kernel/workqueue.c:3340 [inline]\n worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421\n kthread+0x3c5/0x780 kernel/kthread.c:463\n ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\n\nFreed by task 5932:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:56\n kasan_save_track+0x14/0x30 mm/kasan/common.c:77\n __kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587\n kasan_save_free_info mm/kasan/kasan.h:406 [inline]\n poison_slab_object mm/kasan/common.c:252 [inline]\n __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284\n kasan_slab_free include/linux/kasan.h:234 [inline]\n slab_free_hook mm/slub.c:2540 [inline]\n slab_free mm/slub.c:6663 [inline]\n kfree+0x2f8/0x6e0 mm/slub.c:6871\n device_release+0xa4/0x240 drivers/base/core.c:2565\n kobject_cleanup lib/kobject.c:689 [inline]\n kobject_release lib/kobject.c:720 [inline]\n kref_put include/linux/kref.h:65 [inline]\n kobject_put+0x1e7/0x590 lib/kobject.\n---truncated---",
  "id": "GHSA-8q8r-pqgc-3hjc",
  "modified": "2026-05-11T09:30:29Z",
  "published": "2026-05-08T15:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43322"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/035c25007c9e698bef3826070ee34bb6d778020c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/260dc2be643b4a35b27008490c533613e3e53867"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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