CVE-2024-26753

Kernel stack over-read via oversized session memcpy

Published Apr 3, 2024 · Updated May 23, 2026

Stack-buffer over-read in the Linux kernel virtio akcipher driver allows local users to copy excess kernel stack data during session setup. The session initializer copies the full control-request union from a smaller stack-resident parameter instead of limiting the copy to that parameter's size. Reachability requires a virtio-crypto device and asymmetric-key session creation; public sources document no working exploit or consequence beyond the invalid stack read.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-buffer over-read in the Linux kernel virtio akcipher driver allows local users to copy excess kernel stack data during session setup. The session initializer copies the full control-request union from a smaller stack-resident parameter instead of limiting the copy to that parameter's size. Reachability requires a virtio-crypto device and asymmetric-key session creation; public sources document no working exploit or consequence beyond the invalid stack read.

The record

CVE
CVE-2024-26753
Published
Apr 3, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 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

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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=1ff57428894fc4f5001d3df0762c1820295d6c4f <37077ed16c7793e21b005979d33f8a61565b7e86
  2. Affected versionversion=5.10.209 <5.10.212
  3. Affected versionversion=5.18
  4. Affected versionversion=59ca6c93387d325e96577d8bd4c23c78c1491c11 <62f361bfea60c6afc3df09c1ad4152e6507f6f47
  5. Affected versionversion=59ca6c93387d325e96577d8bd4c23c78c1491c11 <b0365460e945e1117b47cf7329d86de752daff63
  6. Affected versionversion=59ca6c93387d325e96577d8bd4c23c78c1491c11 <c0ec2a712daf133d9996a8a1b7ee2d4996080363
  7. Affected versionversion=59ca6c93387d325e96577d8bd4c23c78c1491c11 <ef1e47d50324e232d2da484fe55a54274eeb9bc1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1ff57428894fc4f5001d3df0762c1820295d6c4f <37077ed16c7793e21b005979d33f8a61565b7e86; version=5.10.209 <5.10.212; version=5.18; version=59ca6c93387d325e96577d8bd4c23c78c1491c11 <62f361bfea60c6afc3df09c1ad4152e6507f6f47; version=59ca6c93387d325e96577d8bd4c23c78c1491c11 <b0365460e945e1117b47cf7329d86de752daff63; version=59ca6c93387d325e96577d8bd4c23c78c1491c11 <c0ec2a712daf133d9996a8a1b7ee2d4996080363; version=59ca6c93387d325e96577d8bd4c23c78c1491c11 <ef1e47d50324e232d2da484fe55a54274eeb9bc1

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS: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-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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