CVE-2026-80533

System crash via null AGI buffer dereference

Published Aug 26, 2026 · Updated Aug 26, 2026

NULL pointer dereference in Linux kernel XFS AGI repair from 6.10 allows local users to crash the system when buffer verification fails. The xrep_iunlink_walk_ondisk_bucket function dereferences sc->sa.agi_bp while rebuilding unlinked inode lists even though the verifier can leave that buffer pointer null. Triggering the fault requires a failed AGI buffer verification during XFS online repair; the bounded result is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.17%
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 Linux kernel XFS AGI repair from 6.10 allows local users to crash the system when buffer verification fails. The xrep_iunlink_walk_ondisk_bucket function dereferences sc->sa.agi_bp while rebuilding unlinked inode lists even though the verifier can leave that buffer pointer null. Triggering the fault requires a failed AGI buffer verification during XFS online repair; the bounded result is a kernel crash.

The record

CVE
CVE-2026-80533
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=6.10
  2. Affected versionversion=ab97f4b1c030750f2475bf4da8a9554d02206640 <1e96a00e0d3a00be6e4f368b2f18e2d345f813ce
  3. Affected versionversion=ab97f4b1c030750f2475bf4da8a9554d02206640 <43b4ecbc948a2e441804c9d7b772deb6b2e44e3d
  4. Affected versionversion=ab97f4b1c030750f2475bf4da8a9554d02206640 <a6cfd0e4bb1e5f4dd2a67fa99eab36bda47cf081
  5. Affected versionversion=ab97f4b1c030750f2475bf4da8a9554d02206640 <c36d7f68f1c2e7e528ad11044a0bd6a3016a6a03

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=ab97f4b1c030750f2475bf4da8a9554d02206640 <1e96a00e0d3a00be6e4f368b2f18e2d345f813ce; version=ab97f4b1c030750f2475bf4da8a9554d02206640 <43b4ecbc948a2e441804c9d7b772deb6b2e44e3d; version=ab97f4b1c030750f2475bf4da8a9554d02206640 <a6cfd0e4bb1e5f4dd2a67fa99eab36bda47cf081; version=ab97f4b1c030750f2475bf4da8a9554d02206640 <c36d7f68f1c2e7e528ad11044a0bd6a3016a6a03

Published CVSS scores

5.5Red HatCVSS: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 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

CWE-476NULL Pointer Dereference
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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