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🛡️ CVE-2024-50014 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

ext4: fix access to uninitialised lock in fc replay path

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

ext4: fix access to uninitialised lock in fc replay path

The following kernel trace can be triggered with fstest generic/629 when

executed against a filesystem with fast-commit feature enabled:

INFO: trying to register non-static key.

The code is fine but needs lockdep annotation, or maybe

you didn't initialize this object before use?

turning off the locking correctness validator.

CPU: 0 PID: 866 Comm: mount Not tainted 6.10.0+ #11

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-prebuilt.qemu.org 04/01/2014

Call Trace:

<TASK>

dump_stack_lvl+0x66/0x90

register_lock_class+0x759/0x7d0

__lock_acquire+0x85/0x2630

? __find_get_block+0xb4/0x380

lock_acquire+0xd1/0x2d0

? __ext4_journal_get_write_access+0xd5/0x160

_raw_spin_lock+0x33/0x40

? __ext4_journal_get_write_access+0xd5/0x160

__ext4_journal_get_write_access+0xd5/0x160

ext4_reserve_inode_write+0x61/0xb0

__ext4_mark_inode_dirty+0x79/0x270

? ext4_ext_replay_set_iblocks+0x2f8/0x450

ext4_ext_replay_set_iblocks+0x330/0x450

ext4_fc_replay+0x14c8/0x1540

? jread+0x88/0x2e0

? rcu_is_watching+0x11/0x40

do_one_pass+0x447/0xd00

jbd2_journal_recover+0x139/0x1b0

jbd2_journal_load+0x96/0x390

ext4_load_and_init_journal+0x253/0xd40

ext4_fill_super+0x2cc6/0x3180

...

In the replay path there's an attempt to lock sbi->s_bdev_wb_lock in

function ext4_check_bdev_write_error(). Unfortunately, at this point this

spinlock has not been initialized yet. Moving it's initialization to an

earlier point in __ext4_fill_super() fixes this splat.

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 none, integrity none, 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:N/I:N/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: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2024-50014 is recorded against 2 packages.

  • kernel (from 6.11.0 up to 6.11.3)
  • linux-kernel (from 6.11 up to 6.11.3)

Timeline and source

Published on 21 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

cert-portal.siemens.com (Web)
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:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-10-21
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.11.0 6.11.3
linux-kernel 6.11 6.11.3

Similar Threats

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