CVE-2026-80899Hinoki check available

Kernel hang or panic via repeated pseudo-bio completion

Published Sep 4, 2026 · Updated Sep 4, 2026

Use-after-free in Linux EROFS before 7.1.8 allows attackers to crash or hang the kernel via a crafted compressed fscache image. A split cached and uncached read issues several subreads on one unchained pseudo-bio, while erofs_fscache_bio_endio completes it for every subread, underflowing pending_bios and freeing the decompression queue early. Reachability requires EROFS fscache on-demand mode, a cachefiles daemon serving the image, and a compressed read crossing cached and uncached data.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux EROFS before 7.1.8 allows attackers to crash or hang the kernel via a crafted compressed fscache image. A split cached and uncached read issues several subreads on one unchained pseudo-bio, while erofs_fscache_bio_endio completes it for every subread, underflowing pending_bios and freeing the decompression queue early. Reachability requires EROFS fscache on-demand mode, a cachefiles daemon serving the image, and a compressed read crossing cached and uncached data.

The record

CVE
CVE-2026-80899
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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

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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=0 <7.1.8
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c37460cd9b2fcb61ec66b7eb4fde737e65ec2a56
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f6145794f17a27d25f8a84edb80731fb0e07c196

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=0 <7.1.8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c37460cd9b2fcb61ec66b7eb4fde737e65ec2a56; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f6145794f17a27d25f8a84edb80731fb0e07c196

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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