CVE-2024-49987

Local bpftool disruption via null qsort input

Published Oct 21, 2024 · Updated May 11, 2026

Undefined behavior in bpftool's netfilter display path in Linux allows local users to disrupt the utility via an empty listing. The net.c display routine calls qsort with nf_link_info set to NULL and a zero element count instead of returning before sorting. The caller needs local access to run bpftool; the consequence is confined to bpftool availability, with no reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Undefined behavior in bpftool's netfilter display path in Linux allows local users to disrupt the utility via an empty listing. The net.c display routine calls qsort with nf_link_info set to NULL and a zero element count instead of returning before sorting. The caller needs local access to run bpftool; the consequence is confined to bpftool availability, with no reported data disclosure or modification.

The record

CVE
CVE-2024-49987
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.4
  2. Affected versionversion=d0fe92fb5e3df6991c640fb9205d880b68603259 <2e0f6f33f2aa87493b365a38a8fd87b8854b7734
  3. Affected versionversion=d0fe92fb5e3df6991c640fb9205d880b68603259 <c208b02827eb642758cef65641995fd3f38c89af
  4. Affected versionversion=d0fe92fb5e3df6991c640fb9205d880b68603259 <c2d9f9a7837ab29ccae0c42252f17d436bf0a501
  5. Affected versionversion=d0fe92fb5e3df6991c640fb9205d880b68603259 <f04e2ad394e2755d0bb2d858ecb5598718bf00d5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=d0fe92fb5e3df6991c640fb9205d880b68603259 <2e0f6f33f2aa87493b365a38a8fd87b8854b7734; version=d0fe92fb5e3df6991c640fb9205d880b68603259 <c208b02827eb642758cef65641995fd3f38c89af; version=d0fe92fb5e3df6991c640fb9205d880b68603259 <c2d9f9a7837ab29ccae0c42252f17d436bf0a501; version=d0fe92fb5e3df6991c640fb9205d880b68603259 <f04e2ad394e2755d0bb2d858ecb5598718bf00d5

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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