CVE-2023-52893

Kernel panic via NULL attribute dereference

Published Aug 21, 2024 · Updated May 11, 2026

NULL pointer dereference in Linux 3.0 through 6.2-rc4 allows local users to crash the kernel through an EFI variable request. The gsmi_get_variable function unconditionally writes through its attr pointer even when the EFI pstore caller passes attr=NULL. Local low-privileged access is required, and the resulting NULL dereference panics the host rather than exposing or modifying data.

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

NULL pointer dereference in Linux 3.0 through 6.2-rc4 allows local users to crash the kernel through an EFI variable request. The gsmi_get_variable function unconditionally writes through its attr pointer even when the EFI pstore caller passes attr=NULL. Local low-privileged access is required, and the resulting NULL dereference panics the host rather than exposing or modifying data.

The record

CVE
CVE-2023-52893
Published
Aug 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. Aug 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

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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=3.0
  2. Affected versionversion=74c5b31c6618f01079212332b2e5f6c42f2d6307 <32313c11bdc8a02c577abaf865be3664ab30410a
  3. Affected versionversion=74c5b31c6618f01079212332b2e5f6c42f2d6307 <6646d769fdb0ce4318ef9afd127f8526d1ca8393
  4. Affected versionversion=74c5b31c6618f01079212332b2e5f6c42f2d6307 <a769b05eeed7accc4019a1ed9799dd72067f1ce8
  5. Affected versionversion=74c5b31c6618f01079212332b2e5f6c42f2d6307 <ae2a9dcc8caa60b1e14671294e5ec902ea5d1dfd
  6. Affected versionversion=74c5b31c6618f01079212332b2e5f6c42f2d6307 <eb0421d90f916dffe96b4c049ddf01c0c50620d2
  7. Affected versionversion=74c5b31c6618f01079212332b2e5f6c42f2d6307 <ee5763ef829bd923033510de6d1df7c73f085e4b
  8. Affected versionversion=74c5b31c6618f01079212332b2e5f6c42f2d6307 <ffef77794fb5f1245c3249b86342bad2299accb5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.0; version=74c5b31c6618f01079212332b2e5f6c42f2d6307 <32313c11bdc8a02c577abaf865be3664ab30410a; version=74c5b31c6618f01079212332b2e5f6c42f2d6307 <6646d769fdb0ce4318ef9afd127f8526d1ca8393; version=74c5b31c6618f01079212332b2e5f6c42f2d6307 <a769b05eeed7accc4019a1ed9799dd72067f1ce8; version=74c5b31c6618f01079212332b2e5f6c42f2d6307 <ae2a9dcc8caa60b1e14671294e5ec902ea5d1dfd; version=74c5b31c6618f01079212332b2e5f6c42f2d6307 <eb0421d90f916dffe96b4c049ddf01c0c50620d2; version=74c5b31c6618f01079212332b2e5f6c42f2d6307 <ee5763ef829bd923033510de6d1df7c73f085e4b; version=74c5b31c6618f01079212332b2e5f6c42f2d6307 <ffef77794fb5f1245c3249b86342bad2299accb5

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

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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.

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Technologies

Your stack

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Your stack

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