---
id: CVE-2024-26883
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix stackmap overflow check on 32-bit arches

  The stackmap code relies on roundup_pow_of_two() to compute the number
  of hash buckets, and contains an overflow chec…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix stackmap overflow check on 32-bit arches

  The stackmap code relies on roundup_pow_of_two() to compute the number
  of hash buckets, and contains an overflow chec…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-119
vendor: debian
product: debian_linux
affected:
  - debian_linux = 10.0
  - 'linux_kernel >= 4.9.258, < 4.10'
  - 'linux_kernel >= 4.14.222, < 4.15'
  - 'linux_kernel >= 4.19.177, < 4.19.311'
  - 'linux_kernel >= 5.4.99, < 5.4.273'
  - 'linux_kernel >= 5.10.17, < 5.10.214'
  - 'linux_kernel >= 5.11, < 5.15.153'
  - 'linux_kernel >= 5.16, < 6.1.83'
  - 'linux_kernel >= 6.2, < 6.6.23'
  - 'linux_kernel >= 6.7, < 6.7.11'
  - 'linux_kernel >= 6.8, < 6.8.2'
patched:
  - linux_kernel 6.8.2
published: '2024-04-17'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:17:28.667'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-26883'
references:
  - url: 'https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00253
epssPercentile: 0.15597
ingestedAt: '2026-10-15T03:30:12.656Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-09-10T15:48:22.381696Z'
---

## Overview

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

bpf: Fix stackmap overflow check on 32-bit arches

The stackmap code relies on roundup_pow_of_two() to compute the number
of hash buckets, and contains an overflow check by checking if the
resulting value is 0. However, on 32-bit arches, the roundup code itself
can overflow by doing a 32-bit left-shift of an unsigned long value,
which is undefined behaviour, so it is not guaranteed to truncate
neatly. This was triggered by syzbot on the DEVMAP_HASH type, which
contains the same check, copied from the hashtab code.

The commit in the fixes tag actually attempted to fix this, but the fix
did not account for the UB, so the fix only works on CPUs where an
overflow does result in a neat truncation to zero, which is not
guaranteed. Checking the value before rounding does not have this
problem.

## Affected

- `debian_linux = 10.0`
- `linux_kernel >= 4.9.258, < 4.10`
- `linux_kernel >= 4.14.222, < 4.15`
- `linux_kernel >= 4.19.177, < 4.19.311`
- `linux_kernel >= 5.4.99, < 5.4.273`
- `linux_kernel >= 5.10.17, < 5.10.214`
- `linux_kernel >= 5.11, < 5.15.153`
- `linux_kernel >= 5.16, < 6.1.83`
- `linux_kernel >= 6.2, < 6.6.23`
- `linux_kernel >= 6.7, < 6.7.11`
- `linux_kernel >= 6.8, < 6.8.2`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.8.2`