CVE-2025-21650

Kernel memory disclosure or crash via BAR overrun

Published Jan 19, 2025 · Updated Aug 5, 2026

Out-of-bounds BAR access in affected Linux hns3 drivers allows local users to disclose memory or crash the kernel through an ethtool register dump. hclge_fetch_pf_reg reuses one BAR mapping across both TQP segments instead of each queue's initialized io_base, so queues above index 1023 access unmapped space. The path requires CAP_NET_ADMIN and an HNS3 PF with at least 1,024 TQPs; triggering it can expose kernel memory and halt the host.

CVSS severity7.1
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds BAR access in affected Linux hns3 drivers allows local users to disclose memory or crash the kernel through an ethtool register dump. hclge_fetch_pf_reg reuses one BAR mapping across both TQP segments instead of each queue's initialized io_base, so queues above index 1023 access unmapped space. The path requires CAP_NET_ADMIN and an HNS3 PF with at least 1,024 TQPs; triggering it can expose kernel memory and halt the host.

The record

CVE
CVE-2025-21650
Published
Jan 19, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 19, 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=2b1fff96a297034f03466cfecda9824adafe16ed
  2. Affected versionversion=6.4.16 <6.5
  3. Affected versionversion=6.5.3 <6.6
  4. Affected versionversion=6.6
  5. Affected versionversion=939ccd107ffcade20c9c7055a2e7ae0fd724fb72 <0575baa733fc4219f230aef22d5bc35d922f1e9a
  6. Affected versionversion=939ccd107ffcade20c9c7055a2e7ae0fd724fb72 <7997ddd46c54408bcba5e37fe18b4d832e45d4d4
  7. Affected versionversion=df34972a33d268a7113c119fe4e4b07a6819aa0c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2b1fff96a297034f03466cfecda9824adafe16ed; version=6.4.16 <6.5; version=6.5.3 <6.6; version=6.6; version=939ccd107ffcade20c9c7055a2e7ae0fd724fb72 <0575baa733fc4219f230aef22d5bc35d922f1e9a; version=939ccd107ffcade20c9c7055a2e7ae0fd724fb72 <7997ddd46c54408bcba5e37fe18b4d832e45d4d4; version=df34972a33d268a7113c119fe4e4b07a6819aa0c

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1LinuxCVSS: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

CWE-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application 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

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Your stack

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