CVE-2026-80805Hinoki check available

Kernel out-of-bounds read via malformed XFS metadata

Published Sep 4, 2026 · Updated Sep 4, 2026

Out-of-bounds read in the XFS attribute verifier in Linux allows attackers to trigger a kernel memory read via crafted metadata. xfs_attr3_leaf_verify_entry accesses lentry or rentry length fields before confirming that a nameidx-derived entry pointer and its flexible-array start remain inside the buffer. Triggering requires a malformed XFS attribute leaf to be processed; published records establish neither memory disclosure nor a crash.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in the XFS attribute verifier in Linux allows attackers to trigger a kernel memory read via crafted metadata. xfs_attr3_leaf_verify_entry accesses lentry or rentry length fields before confirming that a nameidx-derived entry pointer and its flexible-array start remain inside the buffer. Triggering requires a malformed XFS attribute leaf to be processed; published records establish neither memory disclosure nor a crash.

The record

CVE
CVE-2026-80805
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.5
  2. Affected versionversion=c84760659dcf237902d4cc997cd5f55cb3b2807f <03a12253dd2a036545bdb0110a4e0b8dc70f8e7c
  3. Affected versionversion=c84760659dcf237902d4cc997cd5f55cb3b2807f <0f82586741e39926542f621bafa424e237a04fa4
  4. Affected versionversion=c84760659dcf237902d4cc997cd5f55cb3b2807f <134d82a2b5e3eba3ebf58753a1387b22f26ca1de
  5. Affected versionversion=c84760659dcf237902d4cc997cd5f55cb3b2807f <184c1a80421a5b5ddcd262e47980ce2e67fee211
  6. Affected versionversion=c84760659dcf237902d4cc997cd5f55cb3b2807f <98a42bb9d60d42898c3494de351a1bf508348cde
  7. Affected versionversion=c84760659dcf237902d4cc997cd5f55cb3b2807f <9f92e749fc08b7ff3d9da190c4d1b2273745b282
  8. Affected versionversion=c84760659dcf237902d4cc997cd5f55cb3b2807f <b7eea80be25f3334f131d52982b3131aba77b97d
  9. Affected versionversion=c84760659dcf237902d4cc997cd5f55cb3b2807f <c35da2bac6f7cb9a9be73f188b4fcc324615c327
  10. Affected versionversion=c84760659dcf237902d4cc997cd5f55cb3b2807f <e99120b5944a16d0bc27e52b33de78bcdaaabf5c

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=c84760659dcf237902d4cc997cd5f55cb3b2807f <03a12253dd2a036545bdb0110a4e0b8dc70f8e7c; version=c84760659dcf237902d4cc997cd5f55cb3b2807f <0f82586741e39926542f621bafa424e237a04fa4; version=c84760659dcf237902d4cc997cd5f55cb3b2807f <134d82a2b5e3eba3ebf58753a1387b22f26ca1de; version=c84760659dcf237902d4cc997cd5f55cb3b2807f <184c1a80421a5b5ddcd262e47980ce2e67fee211; version=c84760659dcf237902d4cc997cd5f55cb3b2807f <98a42bb9d60d42898c3494de351a1bf508348cde; version=c84760659dcf237902d4cc997cd5f55cb3b2807f <9f92e749fc08b7ff3d9da190c4d1b2273745b282; version=c84760659dcf237902d4cc997cd5f55cb3b2807f <b7eea80be25f3334f131d52982b3131aba77b97d; version=c84760659dcf237902d4cc997cd5f55cb3b2807f <c35da2bac6f7cb9a9be73f188b4fcc324615c327; version=c84760659dcf237902d4cc997cd5f55cb3b2807f <e99120b5944a16d0bc27e52b33de78bcdaaabf5c

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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo