CVE-2024-35800

Kdump kernel panic via unchecked EFI callback

Published May 17, 2024 · Updated May 23, 2026

NULL pointer dereference in Linux kernel EFI code allows local users to crash a kdump kernel during kexec-based crash recovery. The generic_ops_supported() function in drivers/firmware/efi/efi.c calls efi.get_next_variable without first checking whether the callback is NULL. The fault is reachable when a kexec-loaded dump kernel lacks that EFI method, causing the secondary kernel to panic during boot and preventing crash-dump collection.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux kernel EFI code allows local users to crash a kdump kernel during kexec-based crash recovery. The generic_ops_supported() function in drivers/firmware/efi/efi.c calls efi.get_next_variable without first checking whether the callback is NULL. The fault is reachable when a kexec-loaded dump kernel lacks that EFI method, causing the secondary kernel to panic during boot and preventing crash-dump collection.

The record

CVE
CVE-2024-35800
Published
May 17, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 17, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=6.1.81 <6.1.84
  2. Affected versionversion=6.3
  3. Affected versionversion=a8901f331b8b7f95a7315d033a22bc84c8365f35 <b9d103aca85f082a343b222493f3cab1219aaaf4
  4. Affected versionversion=bad267f9e18f8e9e628abd1811d2899b1735a4e1 <090d2b4515ade379cd592fbc8931344945978210
  5. Affected versionversion=bad267f9e18f8e9e628abd1811d2899b1735a4e1 <62b71cd73d41ddac6b1760402bbe8c4932e23531
  6. Affected versionversion=bad267f9e18f8e9e628abd1811d2899b1735a4e1 <7784135f134c13af17d9ffb39a57db8500bc60ff
  7. Affected versionversion=bad267f9e18f8e9e628abd1811d2899b1735a4e1 <9114ba9987506bcfbb454f6e68558d68cb1abbde

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1.81 <6.1.84; version=6.3; version=a8901f331b8b7f95a7315d033a22bc84c8365f35 <b9d103aca85f082a343b222493f3cab1219aaaf4; version=bad267f9e18f8e9e628abd1811d2899b1735a4e1 <090d2b4515ade379cd592fbc8931344945978210; version=bad267f9e18f8e9e628abd1811d2899b1735a4e1 <62b71cd73d41ddac6b1760402bbe8c4932e23531; version=bad267f9e18f8e9e628abd1811d2899b1735a4e1 <7784135f134c13af17d9ffb39a57db8500bc60ff; version=bad267f9e18f8e9e628abd1811d2899b1735a4e1 <9114ba9987506bcfbb454f6e68558d68cb1abbde

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

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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