CVE-2024-26763

Encrypted-device corruption via mutable O_DIRECT buffers

Published Apr 3, 2024 · Updated Aug 5, 2026

Data corruption in Linux dm-crypt allows local users to corrupt authenticated-encryption devices through concurrent O_DIRECT writes. dm-crypt encrypts caller-owned bio data in place, allowing userspace to change a buffer after tag computation and produce ciphertext with an invalid authentication tag. Exploitation requires local low-privilege access, dm-crypt authenticated encryption, and a concurrent write race; the bounded result is encrypted-device corruption.

CVSS severity7.1
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data corruption in Linux dm-crypt allows local users to corrupt authenticated-encryption devices through concurrent O_DIRECT writes. dm-crypt encrypts caller-owned bio data in place, allowing userspace to change a buffer after tag computation and produce ciphertext with an invalid authentication tag. Exploitation requires local low-privilege access, dm-crypt authenticated encryption, and a concurrent write race; the bounded result is encrypted-device corruption.

The record

CVE
CVE-2024-26763
Published
Apr 3, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1485
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4.12
  2. Affected versionversion=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <0dccbb93538fe89a86c6de31d4b1c8c560848eaa
  3. Affected versionversion=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <1a4371db68a31076afbe56ecce34fbbe6c80c529
  4. Affected versionversion=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <3c652f6fa1e1f9f02c3fbf359d260ad153ec5f90
  5. Affected versionversion=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <43a202bd552976497474ae144942e32cc5f34d7e
  6. Affected versionversion=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <50c70240097ce41fe6bce6478b80478281e4d0f7
  7. Affected versionversion=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <64ba01a365980755732972523600a961c4266b75
  8. Affected versionversion=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <d9e3763a505e50ba3bd22846f2a8db99429fb857
  9. Affected versionversion=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <e08c2a8d27e989f0f5b0888792643027d7e691e6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <0dccbb93538fe89a86c6de31d4b1c8c560848eaa; version=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <1a4371db68a31076afbe56ecce34fbbe6c80c529; version=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <3c652f6fa1e1f9f02c3fbf359d260ad153ec5f90; version=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <43a202bd552976497474ae144942e32cc5f34d7e; version=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <50c70240097ce41fe6bce6478b80478281e4d0f7; version=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <64ba01a365980755732972523600a961c4266b75; version=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <d9e3763a505e50ba3bd22846f2a8db99429fb857; version=ef43aa38063a6b2b3c6618e28ab35794f4f1fe29 <e08c2a8d27e989f0f5b0888792643027d7e691e6

Published CVSS scores

7.1NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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
T1485Data Destruction

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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