---
id: CVE-2024-36916
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  blk-iocost: avoid out of bounds shift

  UBSAN catches undefined behavior in blk-iocost, where sometimes
  iocg->delay is shifted right by a number that is too large,
  resul…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  blk-iocost: avoid out of bounds shift

  UBSAN catches undefined behavior in blk-iocost, where sometimes
  iocg->delay is shifted right by a number that is too large,
  resul…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'
cwe:
  - CWE-125
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.10, < 5.10.217'
  - 'linux_kernel >= 5.11, < 5.15.159'
  - 'linux_kernel >= 5.16, < 6.1.91'
  - 'linux_kernel >= 6.2, < 6.6.31'
  - 'linux_kernel >= 6.7, < 6.8.10'
  - linux_kernel = 6.9
  - debian_linux = 10.0
patched:
  - linux_kernel 6.8.10
published: '2024-05-30'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:18:25.030'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-36916'
references:
  - url: 'https://git.kernel.org/stable/c/488dc6808cb8369685f18cee81e88e7052ac153b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/62accf6c1d7b433752cb3591bba8967b7a801ad5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/844fc023e9f14a4fb1de5ae1eaefafd6d69c5fa1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/beaa51b36012fad5a4d3c18b88a617aea7a9b96d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ce0e99cae00e3131872936713b7f55eefd53ab86'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f6add0a6f78dc6360b822ca4b6f9f2f14174c8ca'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/488dc6808cb8369685f18cee81e88e7052ac153b'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/62accf6c1d7b433752cb3591bba8967b7a801ad5'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/844fc023e9f14a4fb1de5ae1eaefafd6d69c5fa1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/beaa51b36012fad5a4d3c18b88a617aea7a9b96d'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/ce0e99cae00e3131872936713b7f55eefd53ab86'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/f6add0a6f78dc6360b822ca4b6f9f2f14174c8ca'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20240905-0006/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-613116.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00733
epssPercentile: 0.54159
ingestedAt: '2026-10-15T03:30:12.701Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-06-12T19:19:24.548838Z'
scores:
  nvd: 7.1
  adp: 6.5
---

## Overview

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

blk-iocost: avoid out of bounds shift

UBSAN catches undefined behavior in blk-iocost, where sometimes
iocg->delay is shifted right by a number that is too large,
resulting in undefined behavior on some architectures.

[  186.556576] ------------[ cut here ]------------
UBSAN: shift-out-of-bounds in block/blk-iocost.c:1366:23
shift exponent 64 is too large for 64-bit type 'u64' (aka 'unsigned long long')
CPU: 16 PID: 0 Comm: swapper/16 Tainted: G S          E    N 6.9.0-0_fbk700_debug_rc2_kbuilder_0_gc85af715cac0 #1
Hardware name: Quanta Twin Lakes MP/Twin Lakes Passive MP, BIOS F09_3A23 12/08/2020
Call Trace:
 <IRQ>
 dump_stack_lvl+0x8f/0xe0
 __ubsan_handle_shift_out_of_bounds+0x22c/0x280
 iocg_kick_delay+0x30b/0x310
 ioc_timer_fn+0x2fb/0x1f80
 __run_timer_base+0x1b6/0x250
...

Avoid that undefined behavior by simply taking the
"delay = 0" branch if the shift is too large.

I am not sure what the symptoms of an undefined value
delay will be, but I suspect it could be more than a
little annoying to debug.

## Affected

- `linux_kernel >= 5.10, < 5.10.217`
- `linux_kernel >= 5.11, < 5.15.159`
- `linux_kernel >= 5.16, < 6.1.91`
- `linux_kernel >= 6.2, < 6.6.31`
- `linux_kernel >= 6.7, < 6.8.10`
- `linux_kernel = 6.9`
- `debian_linux = 10.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.8.10`