CVE-2025-38719

Local system crash via zero-length queue calculation

Published Sep 4, 2025 · Updated May 11, 2026

Divide-by-zero in Linux kernel 6.13 through 6.15.10, 6.16 through 6.16.1, and 6.17-rc1 allows local users to crash systems. When a down port releases its queue and sets ring->len to zero, hbg_get_queue_used_num() divides queue indices by that zero length during a debugfs read. Reachability requires the hibmcge driver and access to its debugfs queue entry while the associated port is down; the published impact is limited to availability.

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

Divide-by-zero in Linux kernel 6.13 through 6.15.10, 6.16 through 6.16.1, and 6.17-rc1 allows local users to crash systems. When a down port releases its queue and sets ring->len to zero, hbg_get_queue_used_num() divides queue indices by that zero length during a debugfs read. Reachability requires the hibmcge driver and access to its debugfs queue entry while the associated port is down; the published impact is limited to availability.

The record

CVE
CVE-2025-38719
Published
Sep 4, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 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=40735e7543f94fc88f58d94fd5f88daa4a2f2c6e <475e06113c615dafd44262d6d6bd37786f7f4206
  2. Affected versionversion=40735e7543f94fc88f58d94fd5f88daa4a2f2c6e <7004b26f0b64331143eb0b312e77a357a11427ce
  3. Affected versionversion=40735e7543f94fc88f58d94fd5f88daa4a2f2c6e <c945e1ad4f3b77166a3215dabc0c6c980d4a9c73
  4. Affected versionversion=6.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=40735e7543f94fc88f58d94fd5f88daa4a2f2c6e <475e06113c615dafd44262d6d6bd37786f7f4206; version=40735e7543f94fc88f58d94fd5f88daa4a2f2c6e <7004b26f0b64331143eb0b312e77a357a11427ce; version=40735e7543f94fc88f58d94fd5f88daa4a2f2c6e <c945e1ad4f3b77166a3215dabc0c6c980d4a9c73; version=6.13

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS: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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-369Divide By Zero
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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