CVE-2024-43868

Kernel crash via unaligned RISC-V kexec entry

Published Aug 20, 2024 · Updated May 11, 2026

An alignment flaw in the RISC-V kexec purgatory in Linux allows local users to crash the kernel during a kexec transition. The entry assembly fails to word-align riscv_kernel_entry, so firmware-delegated unaligned access reaches the kexec trap handler and terminates the kernel. Reachability requires RISC-V firmware that delegates unaligned-access exceptions, a kernel configured to handle them, and initiation of the privileged kexec path.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An alignment flaw in the RISC-V kexec purgatory in Linux allows local users to crash the kernel during a kexec transition. The entry assembly fails to word-align riscv_kernel_entry, so firmware-delegated unaligned access reaches the kexec trap handler and terminates the kernel. Reachability requires RISC-V firmware that delegates unaligned-access exceptions, a kernel configured to handle them, and initiation of the privileged kexec path.

The record

CVE
CVE-2024-43868
Published
Aug 20, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 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=5.19
  2. Affected versionversion=736e30af583fb6e0e2b8211b894ff99dea0f1ee7 <10ffafb456f293976c42f700578ef740467cb569
  3. Affected versionversion=736e30af583fb6e0e2b8211b894ff99dea0f1ee7 <5d4aaf16a8255f7c71790e211724ba029609c5ff
  4. Affected versionversion=736e30af583fb6e0e2b8211b894ff99dea0f1ee7 <6e62dab357eea12db0fc62dea94c7a892888e6e8
  5. Affected versionversion=736e30af583fb6e0e2b8211b894ff99dea0f1ee7 <fb197c5d2fd24b9af3d4697d0cf778645846d6d5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=736e30af583fb6e0e2b8211b894ff99dea0f1ee7 <10ffafb456f293976c42f700578ef740467cb569; version=736e30af583fb6e0e2b8211b894ff99dea0f1ee7 <5d4aaf16a8255f7c71790e211724ba029609c5ff; version=736e30af583fb6e0e2b8211b894ff99dea0f1ee7 <6e62dab357eea12db0fc62dea94c7a892888e6e8; version=736e30af583fb6e0e2b8211b894ff99dea0f1ee7 <fb197c5d2fd24b9af3d4697d0cf778645846d6d5

Published CVSS scores

5.5NVDCVSS: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

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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