CVE-2026-80532

Repair hang via cyclic next_unlinked pointers

Published Aug 26, 2026 · Updated Aug 26, 2026

Denial of service in XFS online fsck in Linux allows local users to hang filesystem repair via cyclic next_unlinked pointers. xrep_iunlink_resolve_bucket follows on-disk next_unlinked inode pointers without tracking visited inodes, so a cycle prevents the reconstruction loop from terminating. Triggering the defect requires local access and an XFS online filesystem check; the resulting repair operation remains unresponsive and consumes processing time.

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

Denial of service in XFS online fsck in Linux allows local users to hang filesystem repair via cyclic next_unlinked pointers. xrep_iunlink_resolve_bucket follows on-disk next_unlinked inode pointers without tracking visited inodes, so a cycle prevents the reconstruction loop from terminating. Triggering the defect requires local access and an XFS online filesystem check; the resulting repair operation remains unresponsive and consumes processing time.

The record

CVE
CVE-2026-80532
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-835, T1499.004
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 <23690064f235a88a00c04f2e49f36bfb54ae560d
  3. Affected versionversion=ab97f4b1c030750f2475bf4da8a9554d02206640 <24aec8c88539a382355761a9b924046885b6be40
  4. Affected versionversion=ab97f4b1c030750f2475bf4da8a9554d02206640 <6d67c6b99f1fc07c64b97fcbc974c6f1ada7f622
  5. Affected versionversion=ab97f4b1c030750f2475bf4da8a9554d02206640 <b6baf0db357fb84f3f3cfd33383a00de71a5a1c3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=ab97f4b1c030750f2475bf4da8a9554d02206640 <23690064f235a88a00c04f2e49f36bfb54ae560d; version=ab97f4b1c030750f2475bf4da8a9554d02206640 <24aec8c88539a382355761a9b924046885b6be40; version=ab97f4b1c030750f2475bf4da8a9554d02206640 <6d67c6b99f1fc07c64b97fcbc974c6f1ada7f622; version=ab97f4b1c030750f2475bf4da8a9554d02206640 <b6baf0db357fb84f3f3cfd33383a00de71a5a1c3

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application 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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