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🛡️ CVE-2024-49933 — kernel

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

Description

blk_iocost: fix more out of bound shifts

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

blk_iocost: fix more out of bound shifts

Recently running UBSAN caught few out of bound shifts in the

ioc_forgive_debts() function:

UBSAN: shift-out-of-bounds in block/blk-iocost.c:2142:38

shift exponent 80 is too large for 64-bit type 'u64' (aka 'unsigned long

long')

...

UBSAN: shift-out-of-bounds in block/blk-iocost.c:2144:30

shift exponent 80 is too large for 64-bit type 'u64' (aka 'unsigned long

long')

...

Call Trace:

<IRQ>

dump_stack_lvl+0xca/0x130

__ubsan_handle_shift_out_of_bounds+0x22c/0x280

? __lock_acquire+0x6441/0x7c10

ioc_timer_fn+0x6cec/0x7750

? blk_iocost_init+0x720/0x720

? call_timer_fn+0x5d/0x470

call_timer_fn+0xfa/0x470

? blk_iocost_init+0x720/0x720

__run_timer_base+0x519/0x700

...

Actual impact of this issue was not identified but I propose to fix the

undefined behaviour.

The proposed fix to prevent those out of bound shifts consist of

precalculating exponent before using it the shift operations by taking

min value from the actual exponent and maximum possible number of bits.

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-2024-49933 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

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
lists.debian.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-2024-49933 on other distributions

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

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

References

Similar Threats

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