CVE-2026-80679

Kernel fault via inverted is_ese callback guard

Published Aug 28, 2026 · Updated Aug 28, 2026

NULL pointer dereference in the s390 DASD driver in Linux beginning with 5.3 allows attackers to trigger a kernel fault via an ioctl. The dasd_release_space() guard uses logical AND, so it calls the is_ese discipline callback when that function pointer is NULL. Reachability requires CAP_SYS_ADMIN, a DASD device, and a discipline with no is_ese callback; the disclosed effect is a kernel fault.

CVSS severityUnavailable
Unscored
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

NULL pointer dereference in the s390 DASD driver in Linux beginning with 5.3 allows attackers to trigger a kernel fault via an ioctl. The dasd_release_space() guard uses logical AND, so it calls the is_ese discipline callback when that function pointer is NULL. Reachability requires CAP_SYS_ADMIN, a DASD device, and a discipline with no is_ese callback; the disclosed effect is a kernel fault.

The record

CVE
CVE-2026-80679
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

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=5.3
  2. Affected versionversion=91dc4a197569230683ca8bad551e655a4bf14c30 <3000367a512b1283ca52230bf21f8c91dfbec45b
  3. Affected versionversion=91dc4a197569230683ca8bad551e655a4bf14c30 <3453a993a3f14c1684560ecf26585046976f6ac6
  4. Affected versionversion=91dc4a197569230683ca8bad551e655a4bf14c30 <86cdfd061509bcde84f3145f7221ba64e3e53b1f
  5. Affected versionversion=91dc4a197569230683ca8bad551e655a4bf14c30 <96b8e09b09539f252a5eeea6baebd93c2e3779bd
  6. Affected versionversion=91dc4a197569230683ca8bad551e655a4bf14c30 <9973026f572db6b67570cadc30942f3014e41079
  7. Affected versionversion=91dc4a197569230683ca8bad551e655a4bf14c30 <cdc7b73d0c5a9cd6360b4f8c36eae23b02097e4c
  8. Affected versionversion=91dc4a197569230683ca8bad551e655a4bf14c30 <dbf2ae34d2f1390a9fc1abf3dce7f809e022caae
  9. Affected versionversion=91dc4a197569230683ca8bad551e655a4bf14c30 <e156c70c505c6c9adce3b7be5a82025f00544709

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=91dc4a197569230683ca8bad551e655a4bf14c30 <3000367a512b1283ca52230bf21f8c91dfbec45b; version=91dc4a197569230683ca8bad551e655a4bf14c30 <3453a993a3f14c1684560ecf26585046976f6ac6; version=91dc4a197569230683ca8bad551e655a4bf14c30 <86cdfd061509bcde84f3145f7221ba64e3e53b1f; version=91dc4a197569230683ca8bad551e655a4bf14c30 <96b8e09b09539f252a5eeea6baebd93c2e3779bd; version=91dc4a197569230683ca8bad551e655a4bf14c30 <9973026f572db6b67570cadc30942f3014e41079; version=91dc4a197569230683ca8bad551e655a4bf14c30 <cdc7b73d0c5a9cd6360b4f8c36eae23b02097e4c; version=91dc4a197569230683ca8bad551e655a4bf14c30 <dbf2ae34d2f1390a9fc1abf3dce7f809e022caae; version=91dc4a197569230683ca8bad551e655a4bf14c30 <e156c70c505c6c9adce3b7be5a82025f00544709

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
Privilegesadmin
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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