CVE-2026-80710

Kernel memory corruption via truncated format buffer

Published Aug 28, 2026 · Updated Aug 28, 2026

Out-of-bounds write in Linux s390 DASD format checking allows local users to corrupt kernel memory through a crafted track range. dasd_eckd_check_device_format() computes a 64-bit track-count product but stores it in the 32-bit fmt_buffer_size, so kzalloc() reserves less memory than the channel-program builder writes. Access to the DASD format-check ioctl and an ECKD device are required, and the resulting out-of-bounds write corrupts kernel heap memory.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
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 write in Linux s390 DASD format checking allows local users to corrupt kernel memory through a crafted track range. dasd_eckd_check_device_format() computes a 64-bit track-count product but stores it in the 32-bit fmt_buffer_size, so kzalloc() reserves less memory than the channel-program builder writes. Access to the DASD format-check ioctl and an ECKD device are required, and the resulting out-of-bounds write corrupts kernel heap memory.

The record

CVE
CVE-2026-80710
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=4.7
  2. Affected versionversion=8fd575200db5b53f6ea6818dd017f1b43190db12 <7f40b346462f563a0d6e841a77b5163d2a882a04
  3. Affected versionversion=8fd575200db5b53f6ea6818dd017f1b43190db12 <87f3389cd3920714c53e704778f7ca7f1cf0c39c
  4. Affected versionversion=8fd575200db5b53f6ea6818dd017f1b43190db12 <9f88dda2f22927d22498801a92cab6a9424eaf86
  5. Affected versionversion=8fd575200db5b53f6ea6818dd017f1b43190db12 <aca18289c86f22d3fc2f3f6ff615286e7b1702f6
  6. Affected versionversion=8fd575200db5b53f6ea6818dd017f1b43190db12 <e16e0fc54120cee3c6f0362de95aab6792865857

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.7; version=8fd575200db5b53f6ea6818dd017f1b43190db12 <7f40b346462f563a0d6e841a77b5163d2a882a04; version=8fd575200db5b53f6ea6818dd017f1b43190db12 <87f3389cd3920714c53e704778f7ca7f1cf0c39c; version=8fd575200db5b53f6ea6818dd017f1b43190db12 <9f88dda2f22927d22498801a92cab6a9424eaf86; version=8fd575200db5b53f6ea6818dd017f1b43190db12 <aca18289c86f22d3fc2f3f6ff615286e7b1702f6; version=8fd575200db5b53f6ea6818dd017f1b43190db12 <e16e0fc54120cee3c6f0362de95aab6792865857

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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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