CVE-2024-26856

Invalid kernel access via freed MAC entry

Published Apr 17, 2024 · Updated Aug 5, 2026

Use-after-free in the Sparx5 switch driver in Linux allows attackers to trigger an invalid kernel-memory access during MAC-table removal. The sparx5_del_mact_entry function frees mac_entry with devm_kfree and then reads its vid member to remove the corresponding hardware entry. The path is limited to systems using Sparx5 switching hardware, and the public record documents no demonstrated consequence beyond the invalid post-free access.

CVSS severity7.8
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Sparx5 switch driver in Linux allows attackers to trigger an invalid kernel-memory access during MAC-table removal. The sparx5_del_mact_entry function frees mac_entry with devm_kfree and then reads its vid member to remove the corresponding hardware entry. The path is limited to systems using Sparx5 switching hardware, and the public record documents no demonstrated consequence beyond the invalid post-free access.

The record

CVE
CVE-2024-26856
Published
Apr 17, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=5.14
  2. Affected versionversion=b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2 <0de693d68b0a18d5e256556c7c62d92cca35ad52
  3. Affected versionversion=b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2 <71809805b95052ff551922f11660008fb3666025
  4. Affected versionversion=b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2 <89d72d4125e94aa3c2140fedd97ce07ba9e37674
  5. Affected versionversion=b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2 <e46274df1100fb0c06704195bfff5bfbd418bf64
  6. Affected versionversion=b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2 <e83bebb718fd1f42549358730e1206164e0861d6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2 <0de693d68b0a18d5e256556c7c62d92cca35ad52; version=b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2 <71809805b95052ff551922f11660008fb3666025; version=b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2 <89d72d4125e94aa3c2140fedd97ce07ba9e37674; version=b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2 <e46274df1100fb0c06704195bfff5bfbd418bf64; version=b37a1bae742f92cc9b1f777d54e04ee3d86bbfc2 <e83bebb718fd1f42549358730e1206164e0861d6

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-416Use After Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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