CVE-2025-38320

Kernel-memory disclosure and crash via ptrace stack read

Published Jul 10, 2025 · Updated May 11, 2026

Stack out-of-bounds read in affected Linux arm64 kernels allows local users to disclose kernel memory or crash the system via ptrace. regs_get_kernel_stack_nth() confirms addr is on the task stack but dereferences it normally, allowing compiler-inserted KASAN instrumentation to treat the permitted access as outside the active frame. Reachability requires local low-privileged access on arm64 and affected compiler behavior; the reported effects are kernel-memory disclosure and a host crash.

CVSS severity7.1
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack out-of-bounds read in affected Linux arm64 kernels allows local users to disclose kernel memory or crash the system via ptrace. regs_get_kernel_stack_nth() confirms addr is on the task stack but dereferences it normally, allowing compiler-inserted KASAN instrumentation to treat the permitted access as outside the active frame. Reachability requires local low-privileged access on arm64 and affected compiler behavior; the reported effects are kernel-memory disclosure and a host crash.

The record

CVE
CVE-2025-38320
Published
Jul 10, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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

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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=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <01f91d415a8375d85e0c7d3615cd4a168308bb7c
  2. Affected versionversion=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <21da6d3561f373898349ca7167c9811c020da695
  3. Affected versionversion=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <22f935bc86bdfbde04009f05eee191d220cd8c89
  4. Affected versionversion=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <39dfc971e42d886e7df01371cd1bef505076d84c
  5. Affected versionversion=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <422e565b7889ebfd9c8705a3fc786642afe61fca
  6. Affected versionversion=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <64773b3ea09235168a549a195cba43bb867c4a17
  7. Affected versionversion=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <67abac27d806e8f9d4226ec1528540cf73af673a
  8. Affected versionversion=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <92750bfe7b0d8dbcaf578c091a65eda1c5f9ad38
  9. Affected versionversion=4.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <01f91d415a8375d85e0c7d3615cd4a168308bb7c; version=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <21da6d3561f373898349ca7167c9811c020da695; version=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <22f935bc86bdfbde04009f05eee191d220cd8c89; version=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <39dfc971e42d886e7df01371cd1bef505076d84c; version=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <422e565b7889ebfd9c8705a3fc786642afe61fca; version=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <64773b3ea09235168a549a195cba43bb867c4a17; version=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <67abac27d806e8f9d4226ec1528540cf73af673a; version=0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 <92750bfe7b0d8dbcaf578c091a65eda1c5f9ad38; version=4.8

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

No sourced classifications are available.

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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