CVE-2026-74399

Local system crash via unterminated EVM buffer

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds read in the Linux kernel EVM allows local users to crash the system by reading the evm_xattrs interface. The evm_read_xattrs() function leaves temp[0] uninitialized when its fill loop writes no attributes, then strlen() scans beyond initialized memory. Low-privileged local access is required, and the affected state requires that no configured EVM extended attributes are enabled.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel EVM allows local users to crash the system by reading the evm_xattrs interface. The evm_read_xattrs() function leaves temp[0] uninitialized when its fill loop writes no attributes, then strlen() scans beyond initialized memory. Low-privileged local access is required, and the affected state requires that no configured EVM extended attributes are enabled.

The record

CVE
CVE-2026-74399
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, CAPEC-540
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.18
  2. Affected versionversion=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <0b9f8282b40af4a99d6243d2cb939d14ff36b049
  3. Affected versionversion=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <11143a19f5b8dc8f414deab87571134f9f447313
  4. Affected versionversion=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <12ad52dc45a0c8c9d25e85b4a84201de4c5420ed
  5. Affected versionversion=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <38b7d63b23aa9d2ddde7688040e9426d32be4065
  6. Affected versionversion=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <8df81954d22a653a8b01d46692cd56f71137269b
  7. Affected versionversion=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d
  8. Affected versionversion=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <a36cbfb85f26e6c6fb6529b1a364331b94dc88f3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.18; version=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <0b9f8282b40af4a99d6243d2cb939d14ff36b049; version=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <11143a19f5b8dc8f414deab87571134f9f447313; version=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <12ad52dc45a0c8c9d25e85b4a84201de4c5420ed; version=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <38b7d63b23aa9d2ddde7688040e9426d32be4065; version=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <8df81954d22a653a8b01d46692cd56f71137269b; version=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d; version=fa516b66a1bfce1d72f1620c54bdfebc493000d1 <a36cbfb85f26e6c6fb6529b1a364331b94dc88f3

Published CVSS scores

1.9Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Oracle LinuxCVSS: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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers

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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