CVE-2025-38261

Privilege escalation or panic via stale SR_SUM state

Published Jul 9, 2025 · Updated Aug 5, 2026

Context-state corruption in Linux 4.15 through 6.15.4 allows local users to gain kernel privileges or crash RISC-V systems. The RISC-V switch_to path fails to save and restore SR_SUM, so a task can resume with access to user memory unexpectedly enabled or disabled. Unprivileged code can drive uaccess-heavy system calls and context switches; stale enabled state permits kernel memory corruption, while cleared state causes an oops or panic.

CVSS severity7.8
High
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

Context-state corruption in Linux 4.15 through 6.15.4 allows local users to gain kernel privileges or crash RISC-V systems. The RISC-V switch_to path fails to save and restore SR_SUM, so a task can resume with access to user memory unexpectedly enabled or disabled. Unprivileged code can drive uaccess-heavy system calls and context switches; stale enabled state permits kernel memory corruption, while cleared state causes an oops or panic.

The record

CVE
CVE-2025-38261
Published
Jul 9, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 9, 2025CVE 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=4.15
  2. Affected versionversion=76d2a0493a17d4c8ecc781366850c3c4f8e1a446 <69ea599a8dab93a620c92c255be4239a06290a77
  3. Affected versionversion=76d2a0493a17d4c8ecc781366850c3c4f8e1a446 <788aa64c01f1262310b4c1fb827a36df170d86ea

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=76d2a0493a17d4c8ecc781366850c3c4f8e1a446 <69ea599a8dab93a620c92c255be4239a06290a77; version=76d2a0493a17d4c8ecc781366850c3c4f8e1a446 <788aa64c01f1262310b4c1fb827a36df170d86ea

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8LinuxCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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