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🛡️ CVE-2024-50077 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Bluetooth: ISO: Fix multiple init when debugfs is disabled

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

Bluetooth: ISO: Fix multiple init when debugfs is disabled

If bt_debugfs is not created successfully, which happens if either

CONFIG_DEBUG_FS or CONFIG_DEBUG_FS_ALLOW_ALL is unset, then iso_init()

returns early and does not set iso_inited to true. This means that a

subsequent call to iso_init() will result in duplicate calls to

proto_register(), bt_sock_register(), etc.

With CONFIG_LIST_HARDENED and CONFIG_BUG_ON_DATA_CORRUPTION enabled, the

duplicate call to proto_register() triggers this BUG():

list_add double add: new=ffffffffc0b280d0, prev=ffffffffbab56250,

next=ffffffffc0b280d0.

------------[ cut here ]------------

kernel BUG at lib/list_debug.c:35!

Oops: invalid opcode: 0000 [#1] PREEMPT SMP PTI

CPU: 2 PID: 887 Comm: bluetoothd Not tainted 6.10.11-1-ao-desktop #1

RIP: 0010:__list_add_valid_or_report+0x9a/0xa0

...

__list_add_valid_or_report+0x9a/0xa0

proto_register+0x2b5/0x340

iso_init+0x23/0x150 [bluetooth]

set_iso_socket_func+0x68/0x1b0 [bluetooth]

kmem_cache_free+0x308/0x330

hci_sock_sendmsg+0x990/0x9e0 [bluetooth]

__sock_sendmsg+0x7b/0x80

sock_write_iter+0x9a/0x110

do_iter_readv_writev+0x11d/0x220

vfs_writev+0x180/0x3e0

do_writev+0xca/0x100

...

This change removes the early return. The check for iso_debugfs being

NULL was unnecessary, it is always NULL when iso_inited is false.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2024-50077 is recorded against 2 packages.

  • kernel (from 6.7.0 up to 6.11.5)
  • linux-kernel

Timeline and source

Published on 29 October 2024 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
lists.debian.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2024-50077 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-10-29
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.11.5
linux-kernel — —

Similar Threats

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