CVE-2024-38667

Kernel memory corruption via idle-stack overlap

Published Jun 24, 2024 · Updated May 11, 2026

Memory corruption in the RISC-V Linux kernel allows local users to corrupt secondary idle-thread register state during CPU hotplug. Secondary-hart startup fails to reserve the top of each idle-thread stack for pt_regs, so smp_callin overwrites registers and the status field. The observed path requires secondary harts and the V extension, and it causes invalid vector-context save or restore; no practical attack sequence is public.

CVSS severity7.8
High
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

Memory corruption in the RISC-V Linux kernel allows local users to corrupt secondary idle-thread register state during CPU hotplug. Secondary-hart startup fails to reserve the top of each idle-thread stack for pt_regs, so smp_callin overwrites registers and the status field. The observed path requires secondary harts and the V extension, and it causes invalid vector-context save or restore; no practical attack sequence is public.

The record

CVE
CVE-2024-38667
Published
Jun 24, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 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=2875fe0561569f82d0e63658ccf0d11ce7da8922 <0c1f28c32a194303da630fca89481334b9547b80
  2. Affected versionversion=2875fe0561569f82d0e63658ccf0d11ce7da8922 <3090c06d50eaa91317f84bf3eac4c265e6cb8d44
  3. Affected versionversion=2875fe0561569f82d0e63658ccf0d11ce7da8922 <a638b0461b58aa3205cd9d5f14d6f703d795b4af
  4. Affected versionversion=2875fe0561569f82d0e63658ccf0d11ce7da8922 <ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9e
  5. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2875fe0561569f82d0e63658ccf0d11ce7da8922 <0c1f28c32a194303da630fca89481334b9547b80; version=2875fe0561569f82d0e63658ccf0d11ce7da8922 <3090c06d50eaa91317f84bf3eac4c265e6cb8d44; version=2875fe0561569f82d0e63658ccf0d11ce7da8922 <a638b0461b58aa3205cd9d5f14d6f703d795b4af; version=2875fe0561569f82d0e63658ccf0d11ce7da8922 <ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9e; version=5.7

Published CVSS scores

7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NISTCVSS: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.

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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-787Out-of-bounds Write

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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