CVE-2026-80531

Kernel memory corruption via dangling XFS tempfile pointer

Published Aug 26, 2026 · Updated Aug 27, 2026

Use-after-free in XFS online repair in affected Linux kernels starting with 6.10 allows local users to corrupt kernel memory via a scrub ioctl. On a late xrep_tempfile_create failure, the code releases the temporary inode but leaves sc->tempip pointing to it, and xchk_teardown dereferences that freed inode. Reachability requires CAP_SYS_ADMIN, an XFS filesystem with online repair enabled, and an induced failure such as ENOSPC or EIO; consequences include a kernel panic or arbitrary kernel read, write, and control flow.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in XFS online repair in affected Linux kernels starting with 6.10 allows local users to corrupt kernel memory via a scrub ioctl. On a late xrep_tempfile_create failure, the code releases the temporary inode but leaves sc->tempip pointing to it, and xchk_teardown dereferences that freed inode. Reachability requires CAP_SYS_ADMIN, an XFS filesystem with online repair enabled, and an induced failure such as ENOSPC or EIO; consequences include a kernel panic or arbitrary kernel read, write, and control flow.

The record

CVE
CVE-2026-80531
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499.004, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=84c14ee39dd388d73054181c70b3f42af7ddc238 <08a20776ce33a2a52d856911e447c59424f0465a
  3. Affected versionversion=84c14ee39dd388d73054181c70b3f42af7ddc238 <0c88e10d12de9ca7cbed1467bb1b52310101bff8
  4. Affected versionversion=84c14ee39dd388d73054181c70b3f42af7ddc238 <96246a3200d32a43766152e56bc7ae2d93604d74
  5. Affected versionversion=84c14ee39dd388d73054181c70b3f42af7ddc238 <cd1f876d1bc2e94f271e07c606cacd85b109108a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=84c14ee39dd388d73054181c70b3f42af7ddc238 <08a20776ce33a2a52d856911e447c59424f0465a; version=84c14ee39dd388d73054181c70b3f42af7ddc238 <0c88e10d12de9ca7cbed1467bb1b52310101bff8; version=84c14ee39dd388d73054181c70b3f42af7ddc238 <96246a3200d32a43766152e56bc7ae2d93604d74; version=84c14ee39dd388d73054181c70b3f42af7ddc238 <cd1f876d1bc2e94f271e07c606cacd85b109108a

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-825Expired Pointer Dereference
T1499.004Application or System Exploitation
T1068Exploitation for Privilege Escalation

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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