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Fencer Vulns
high 8.8

CVE-2022-49111 json

Bluetooth: Fix use after free in hci_send_acl

published 2025-02-26 20 mo ago modified 2026-08-05 3 mo ago also EUVD-2022-55101

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

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

Bluetooth: Fix use after free in hci_send_acl

This fixes the following trace caused by receiving HCI_EV_DISCONN_PHY_LINK_COMPLETE which does call hci_conn_del without first checking if conn->type is in fact AMP_LINK and in case it is do properly cleanup upper layers with hci_disconn_cfm:

================================================================== BUG: KASAN: use-after-free in hci_send_acl+0xaba/0xc50 Read of size 8 at addr ffff88800e404818 by task bluetoothd/142

CPU: 0 PID: 142 Comm: bluetoothd Not tainted 5.17.0-rc5-00006-gda4022eeac1a #7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x45/0x59 print_address_description.constprop.0+0x1f/0x150 kasan_report.cold+0x7f/0x11b hci_send_acl+0xaba/0xc50 l2cap_do_send+0x23f/0x3d0 l2cap_chan_send+0xc06/0x2cc0 l2cap_sock_sendmsg+0x201/0x2b0 sock_sendmsg+0xdc/0x110 sock_write_iter+0x20f/0x370 do_iter_readv_writev+0x343/0x690 do_iter_write+0x132/0x640 vfs_writev+0x198/0x570 do_writev+0x202/0x280 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RSP: 002b:00007ffce8a099b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 Code: 0f 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 14 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10 RDX: 0000000000000001 RSI: 00007ffce8a099e0 RDI: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffce8a099e0 RCX: 00007f788fc3cf77 R10: 00007ffce8af7080 R11: 0000000000000246 R12: 000055e4ccf75580 RBP: 0000000000000015 R08: 0000000000000002 R09: 0000000000000001 </TASK> R13: 000055e4ccf754a0 R14: 000055e4ccf75cd0 R15: 000055e4ccf4a6b0

Allocated by task 45: kasan_save_stack+0x1e/0x40 __kasan_kmalloc+0x81/0xa0 hci_chan_create+0x9a/0x2f0 l2cap_conn_add.part.0+0x1a/0xdc0 l2cap_connect_cfm+0x236/0x1000 le_conn_complete_evt+0x15a7/0x1db0 hci_le_conn_complete_evt+0x226/0x2c0 hci_le_meta_evt+0x247/0x450 hci_event_packet+0x61b/0xe90 hci_rx_work+0x4d5/0xc50 process_one_work+0x8fb/0x15a0 worker_thread+0x576/0x1240 kthread+0x29d/0x340 ret_from_fork+0x1f/0x30

Freed by task 45: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_set_free_info+0x20/0x30 __kasan_slab_free+0xfb/0x130 kfree+0xac/0x350 hci_conn_cleanup+0x101/0x6a0 hci_conn_del+0x27e/0x6c0 hci_disconn_phylink_complete_evt+0xe0/0x120 hci_event_packet+0x812/0xe90 hci_rx_work+0x4d5/0xc50 process_one_work+0x8fb/0x15a0 worker_thread+0x576/0x1240 kthread+0x29d/0x340 ret_from_fork+0x1f/0x30

The buggy address belongs to the object at ffff88800c0f0500 The buggy address is located 24 bytes inside of which belongs to the cache kmalloc-128 of size 128 The buggy address belongs to the page: 128-byte region [ffff88800c0f0500, ffff88800c0f0580) flags: 0x100000000000200(slab|node=0|zone=1) page:00000000fe45cd86 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc0f0 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 raw: 0100000000000200 ffffea00003a2c80 dead000000000004 ffff8880078418c0 page dumped because: kasan: bad access detected ffff88800c0f0400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc Memory state around the buggy address: >ffff88800c0f0500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88800c0f0480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88800c0f0580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc

---truncated---

Patch / fix

  • Linux Linux 4.9.311, 4.14.276, 4.19.238, 5.4.189, 5.10.111, 5.15.34, 5.16.20, 5.17.3, 5.18
  • linux Debian 14, Debian 13, Debian 12 5.17.3-1

debian advisories DEBIAN-CVE-2022-49111

  • linux Ubuntu 18.04 LTS 4.15.0-189.200
  • linux Ubuntu 20.04 LTS 5.4.0-117.132
  • linux Ubuntu 22.04 LTS 5.15.0-37.39
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1137.148
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1078.84
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1011.14
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1078.84
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1008.12

ubuntu advisories UBUNTU-CVE-2022-49111

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt RHEL 8 4.18.0-553.60.1.rt7.401.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.60.1.rt7.401.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.60.1.rt7.401.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.60.1.rt7.401.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.60.1.rt7.401.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.60.1.rt7.401.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.60.1.rt7.401.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.60.1.rt7.401.el8_10

red hat advisories RHSA-2025:10673RHSA-2025:10670RHSA-2025:10669RHSA-2025:10211RHSA-2025:10193RHSA-2025:10179

  • kernel-64kb SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS, Enterprise Storage 7.1 5.3.18-150300.59.204.1
  • kernel-syms SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.204.1
  • kernel-source SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.204.1
  • kernel-default SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +5 more 5.3.18-150300.59.204.1
  • kernel-preempt SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.204.1
  • kernel-obs-build SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.204.1
  • kernel-default-base SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +3 more 5.3.18-150300.59.204.1.150300.18.122.1
  • kernel-rt SLE Micro 5.2, SLE Micro 5.1 5.3.18-150300.208.1

suse advisories SUSE-SU-2025:01633-1SUSE-SU-2025:01600-1SUSE-SU-2025:1574-1SUSE-SU-2025:1263-1SUSE-SU-2025:1241-1SUSE-SU-2025:1194-1

  • kernel AlmaLinux 8 4.18.0-553.60.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.60.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.60.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.60.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.60.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.60.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.60.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.60.1.el8_10

almalinux advisories ALSA-2025:10669ALSA-2025:10670

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-49111 updated cvss 7.0

kernel: Bluetooth: Fix use after free in hci_send_acl

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) perf 5.14.0-284.11.1.el9_2, rtla 5.14.0-284.11.1.el9_2, kernel-devel-matched 5.14.0-284.11.1.el9_2, kernel-64k-devel-matched 5.14.0-284.11.1.el9_2, kernel-debug-devel-matched 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.11.1.el9_2, +5 more
    fixed: vendor fix RHSA-2023:2458
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.136.1.el9_0, kernel-devel-matched 5.14.0-70.136.1.el9_0, kernel-debug-devel-matched 5.14.0-70.136.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.136.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.136.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.136.1.el9_0, +2 more
    fixed: vendor fix RHSA-2025:10174
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.60.1.el8_10, kernel 4.18.0-553.60.1.el8_10, bpftool 4.18.0-553.60.1.el8_10, kernel-core 4.18.0-553.60.1.el8_10, kernel-tools 4.18.0-553.60.1.el8_10, python3-perf 4.18.0-553.60.1.el8_10, +15 more
    fixed: vendor fix RHSA-2025:10669
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.0.0-284.11.1.el9_2, kernel 5.14.0-284.11.1.el9_2, kernel-64k 5.14.0-284.11.1.el9_2, kernel-core 5.14.0-284.11.1.el9_2, kernel-tools 5.14.0-284.11.1.el9_2, python3-perf 5.14.0-284.11.1.el9_2, +28 more
    fixed: vendor fix RHSA-2023:2458
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.156.1.el8_2, kernel 4.18.0-193.156.1.el8_2, bpftool 4.18.0-193.156.1.el8_2, kernel-core 4.18.0-193.156.1.el8_2, kernel-tools 4.18.0-193.156.1.el8_2, python3-perf 4.18.0-193.156.1.el8_2, +8 more
    fixed: vendor fix RHSA-2025:10179
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.161.1.el8_4, kernel 4.18.0-305.161.1.el8_4, bpftool 4.18.0-305.161.1.el8_4, kernel-core 4.18.0-305.161.1.el8_4, kernel-tools 4.18.0-305.161.1.el8_4, python3-perf 4.18.0-305.161.1.el8_4, +8 more
    fixed: vendor fix RHSA-2025:10005
show 11 more
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.151.1.el8_6, kernel 4.18.0-372.151.1.el8_6, bpftool 4.18.0-372.151.1.el8_6, kernel-core 4.18.0-372.151.1.el8_6, kernel-tools 4.18.0-372.151.1.el8_6, python3-perf 4.18.0-372.151.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.151.1.el8_6, kernel 4.18.0-372.151.1.el8_6, bpftool 4.18.0-372.151.1.el8_6, kernel-core 4.18.0-372.151.1.el8_6, kernel-tools 4.18.0-372.151.1.el8_6, python3-perf 4.18.0-372.151.1.el8_6, +15 more
    fixed: vendor fix RHSA-2025:10673
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.100.1.el8_8, kernel 4.18.0-477.100.1.el8_8, bpftool 4.18.0-477.100.1.el8_8, kernel-core 4.18.0-477.100.1.el8_8, kernel-tools 4.18.0-477.100.1.el8_8, python3-perf 4.18.0-477.100.1.el8_8, +9 more
    fixed: vendor fix RHSA-2025:10211
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.136.1.el9_0, bpftool 5.14.0-70.136.1.el9_0, kernel-core 5.14.0-70.136.1.el9_0, kernel-tools 5.14.0-70.136.1.el9_0, python3-perf 5.14.0-70.136.1.el9_0, kernel-modules 5.14.0-70.136.1.el9_0, +14 more
    fixed: vendor fix RHSA-2025:10174
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.151.1.el8_6, kernel 4.18.0-372.151.1.el8_6, bpftool 4.18.0-372.151.1.el8_6, kernel-core 4.18.0-372.151.1.el8_6, kernel-tools 4.18.0-372.151.1.el8_6, python3-perf 4.18.0-372.151.1.el8_6, +8 more
    fixed: vendor fix RHSA-2025:10673
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.100.1.el8_8, kernel 4.18.0-477.100.1.el8_8, bpftool 4.18.0-477.100.1.el8_8, kernel-core 4.18.0-477.100.1.el8_8, kernel-tools 4.18.0-477.100.1.el8_8, python3-perf 4.18.0-477.100.1.el8_8, +8 more
    fixed: vendor fix RHSA-2025:10211
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.60.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.60.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.60.1.el8_10
    fixed: vendor fix RHSA-2025:10669
  • Red Hat Enterprise Linux CRB (v. 9) kernel-debuginfo-common-s390x 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.11.1.el9_2
    fixed: vendor fix RHSA-2023:2458
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.60.1.rt7.401.el8_10, kernel-rt-kvm 4.18.0-553.60.1.rt7.401.el8_10, kernel-rt-core 4.18.0-553.60.1.rt7.401.el8_10, kernel-rt-modules 4.18.0-553.60.1.rt7.401.el8_10, kernel-rt-debug-kvm 4.18.0-553.60.1.rt7.401.el8_10, kernel-rt-debug-core 4.18.0-553.60.1.rt7.401.el8_10, +4 more
    fixed: vendor fix RHSA-2025:10670
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-kvm 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-core 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-modules 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-debug-kvm 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-debug-core 5.14.0-70.136.1.rt21.208.el9_0, +4 more Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-core 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-modules 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-debug-core 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-debug-modules 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-modules-extra 5.14.0-70.136.1.rt21.208.el9_0, +2 more
    fixed: vendor fix RHSA-2025:10193
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.60.1.rt7.401.el8_10, kernel-rt-core 4.18.0-553.60.1.rt7.401.el8_10, kernel-rt-modules 4.18.0-553.60.1.rt7.401.el8_10, kernel-rt-debug-core 4.18.0-553.60.1.rt7.401.el8_10, kernel-rt-debug-modules 4.18.0-553.60.1.rt7.401.el8_10, kernel-rt-modules-extra 4.18.0-553.60.1.rt7.401.el8_10, +2 more
    fixed: vendor fix RHSA-2025:10670
  • Red Hat Enterprise Linux 10 kernel
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
20 mo ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.