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Fencer Vulns
medium 5.5

CVE-2024-50255 json

Bluetooth: hci: fix null-ptr-deref in hci_read_supported_codecs

published 2024-11-09 1 y ago modified 2026-06-17 4 mo ago also EUVD-2024-44757

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

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

Bluetooth: hci: fix null-ptr-deref in hci_read_supported_codecs

Fix __hci_cmd_sync_sk() to return not NULL for unknown opcodes.

__hci_cmd_sync_sk() returns NULL if a command returns a status event. However, it also returns NULL where an opcode doesn't exist in the hci_cc table because hci_cmd_complete_evt() assumes status = skb->data[0] for unknown opcodes. This leads to null-ptr-deref in cmd_sync for HCI_OP_READ_LOCAL_CODECS as there is no hci_cc for HCI_OP_READ_LOCAL_CODECS, which always assumes status = skb->data[0].

KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] CPU: 1 PID: 2000 Comm: kworker/u9:5 Not tainted 6.9.0-ga6bcb805883c-dirty #10 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: hci7 hci_power_on RIP: 0010:hci_read_supported_codecs+0xb9/0x870 net/bluetooth/hci_codec.c:138 Code: 08 48 89 ef e8 b8 c1 8f fd 48 8b 75 00 e9 96 00 00 00 49 89 c6 48 ba 00 00 00 00 00 fc ff df 4c 8d 60 70 4c 89 e3 48 c1 eb 03 <0f> b6 04 13 84 c0 0f 85 82 06 00 00 41 83 3c 24 02 77 0a e8 bf 78 RSP: 0018:ffff888120bafac8 EFLAGS: 00010212 RAX: 0000000000000000 RBX: 000000000000000e RCX: ffff8881173f0040 RDX: dffffc0000000000 RSI: ffffffffa58496c0 RDI: ffff88810b9ad1e4 RBP: ffff88810b9ac000 R08: ffffffffa77882a7 R09: 1ffffffff4ef1054 R10: dffffc0000000000 R11: fffffbfff4ef1055 R12: 0000000000000070 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810b9ac000 FS: 0000000000000000(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6ddaa3439e CR3: 0000000139764003 CR4: 0000000000770ef0 PKRU: 55555554 Call Trace: <TASK> hci_read_local_codecs_sync net/bluetooth/hci_sync.c:4546 [inline] hci_init_stage_sync net/bluetooth/hci_sync.c:3441 [inline] hci_init4_sync net/bluetooth/hci_sync.c:4706 [inline] hci_init_sync net/bluetooth/hci_sync.c:4742 [inline] hci_dev_init_sync net/bluetooth/hci_sync.c:4912 [inline] hci_dev_open_sync+0x19a9/0x2d30 net/bluetooth/hci_sync.c:4994 hci_dev_do_open net/bluetooth/hci_core.c:483 [inline] hci_power_on+0x11e/0x560 net/bluetooth/hci_core.c:1015 process_one_work kernel/workqueue.c:3267 [inline] process_scheduled_works+0x8ef/0x14f0 kernel/workqueue.c:3348 worker_thread+0x91f/0xe50 kernel/workqueue.c:3429 kthread+0x2cb/0x360 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Patch / fix

  • Linux Linux 6.1.116, 6.6.60, 6.11.7, 6.12
  • linux Debian 12 6.1.119-1
  • linux Debian 14, Debian 13 6.11.7-1

debian advisories DEBIAN-CVE-2024-50255

  • linux Ubuntu 24.04 LTS 6.8.0-58.60
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1027.29
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1028.30
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1023.27
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1024.24
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1027.32
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1010.12
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1028.32

ubuntu advisories UBUNTU-CVE-2024-50255

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 RHEL 9 5.14.0-503.19.1.el9_5
  • rv RHEL 9 5.14.0-503.19.1.el9_5
  • perf RHEL 9 5.14.0-503.19.1.el9_5
  • rtla RHEL 9 5.14.0-503.19.1.el9_5
  • bpftool RHEL 9 7.4.0-503.19.1.el9_5
  • libperf RHEL 9 5.14.0-503.19.1.el9_5
  • kernel-rt RHEL 9 5.14.0-503.19.1.el9_5
  • kernel-64k RHEL 9 5.14.0-503.19.1.el9_5

red hat advisories RHSA-2024:11486

  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-default-base Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1.21.4
  • kernel-livepatch-MICRO-6-0_Update_4 Linux Micro 6.1, Linux Micro 6.0 1-1.2
  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-22.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-22.1
  • kernel-livepatch-MICRO-6-0-RT_Update_4 Linux Micro 6.1, Linux Micro 6.0 1-1.1

suse advisories SUSE-SU-2025:20164-1SUSE-SU-2025:20247-1SUSE-SU-2025:20163-1SUSE-SU-2025:20246-1SUSE-SU-2024:4387-1SUSE-SU-2024:4376-1

  • kernel-source-longterm openSUSE Tumbleweed 6.12.11-1.1
  • kernel-source openSUSE Tumbleweed 6.11.8-1.1

opensuse advisories openSUSE-SU-2025:14705-1openSUSE-SU-2024:14500-1

  • kernel AlmaLinux 9 5.14.0-503.19.1.el9_5
  • rv AlmaLinux 9 5.14.0-503.19.1.el9_5
  • perf AlmaLinux 9 5.14.0-503.19.1.el9_5
  • rtla AlmaLinux 9 5.14.0-503.19.1.el9_5
  • bpftool AlmaLinux 9 7.4.0-503.19.1.el9_5
  • libperf AlmaLinux 9 5.14.0-503.19.1.el9_5
  • kernel-rt AlmaLinux 9 5.14.0-503.19.1.el9_5
  • kernel-64k AlmaLinux 9 5.14.0-503.19.1.el9_5

almalinux advisories ALSA-2024:11486

  • kernel Azure Linux 3.0 6.6.64.2-1

azure linux advisories AZL-53298

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2024-50255 updated cvss 5.5

kernel: Bluetooth: hci: fix null-ptr-deref in hci_read_supported_codecs

  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 9) libperf 5.14.0-503.19.1.el9_5, kernel-debuginfo-common-s390x 5.14.0-503.19.1.el9_5, kernel-debuginfo-common-x86_64 5.14.0-503.19.1.el9_5, kernel-debuginfo-common-aarch64 5.14.0-503.19.1.el9_5, kernel-debuginfo-common-ppc64le 5.14.0-503.19.1.el9_5 Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-503.19.1.el9_5, perf 5.14.0-503.19.1.el9_5, rtla 5.14.0-503.19.1.el9_5, kernel-devel-matched 5.14.0-503.19.1.el9_5, kernel-64k-devel-matched 5.14.0-503.19.1.el9_5, kernel-debug-devel-matched 5.14.0-503.19.1.el9_5, +6 more Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.4.0-503.19.1.el9_5, kernel 5.14.0-503.19.1.el9_5, kernel-64k 5.14.0-503.19.1.el9_5, kernel-core 5.14.0-503.19.1.el9_5, kernel-tools 5.14.0-503.19.1.el9_5, python3-perf 5.14.0-503.19.1.el9_5, +29 more Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-503.19.1.el9_5, kernel-rt-core 5.14.0-503.19.1.el9_5, kernel-rt-modules 5.14.0-503.19.1.el9_5, kernel-rt-debug-core 5.14.0-503.19.1.el9_5, kernel-rt-modules-core 5.14.0-503.19.1.el9_5, kernel-rt-debug-modules 5.14.0-503.19.1.el9_5, +4 more Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-503.19.1.el9_5, kernel-rt-kvm 5.14.0-503.19.1.el9_5, kernel-rt-core 5.14.0-503.19.1.el9_5, kernel-rt-modules 5.14.0-503.19.1.el9_5, kernel-rt-debug-kvm 5.14.0-503.19.1.el9_5, kernel-rt-debug-core 5.14.0-503.19.1.el9_5, +6 more
    fixed: vendor fix RHSA-2024:11486
  • 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
    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
partial
Assessed
13 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.