CVE-2025-38315

System crash via oversized DSBR EFI variable

Published Jul 10, 2025 · Updated May 11, 2026

Stack buffer overflow in btintel in Linux kernel 6.11 through 6.12.33 and 6.13 through 6.15.2 allows local users to crash the system. btintel_uefi_get_dsbr first queries the EFI variable length, then passes that untrusted length to efi.get_variable while writing into a smaller fixed-size stack structure. Reachability requires EFI runtime services, the btintel driver, and a DSBR EFI variable larger than that structure; the reported consequence is an availability-only system crash.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in btintel in Linux kernel 6.11 through 6.12.33 and 6.13 through 6.15.2 allows local users to crash the system. btintel_uefi_get_dsbr first queries the EFI variable length, then passes that untrusted length to efi.get_variable while writing into a smaller fixed-size stack structure. Reachability requires EFI runtime services, the btintel driver, and a DSBR EFI variable larger than that structure; the reported consequence is an availability-only system crash.

The record

CVE
CVE-2025-38315
Published
Jul 10, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-674, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2025CVE 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

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=6.11
  2. Affected versionversion=eb9e749c0182affafadfbe5ded4503c4b5a9b57c <3aa1dc3c9060e335e82e9c182bf3d1db29220b1b
  3. Affected versionversion=eb9e749c0182affafadfbe5ded4503c4b5a9b57c <7b8526bb489780ccc0caffc446ecabec83cfe568
  4. Affected versionversion=eb9e749c0182affafadfbe5ded4503c4b5a9b57c <9427f6081f37c795a8bd29d0ee72a4da3bd64af8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=eb9e749c0182affafadfbe5ded4503c4b5a9b57c <3aa1dc3c9060e335e82e9c182bf3d1db29220b1b; version=eb9e749c0182affafadfbe5ded4503c4b5a9b57c <7b8526bb489780ccc0caffc446ecabec83cfe568; version=eb9e749c0182affafadfbe5ded4503c4b5a9b57c <9427f6081f37c795a8bd29d0ee72a4da3bd64af8

Published CVSS scores

6.4Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS: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

CWE-674Uncontrolled Recursion
T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

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