CVE-2026-80734Network attack vectorHinoki check available

Kernel crash via stale cached-inode mapping order

Published Sep 3, 2026 · Updated Sep 3, 2026

Denial of service in the btrfs inode cache in Linux allows remote authenticated users to crash the kernel through file I/O on affected volumes. The cached-inode path in btrfs_fill_inode skips btrfs_set_inode_mapping_order, leaving a 4K folio order for an 8K block size. The documented reproducer requires an 8K btrfs block size, a 4K page size, writable files, and eviction and reload of a cached inode; the resulting assertion aborts kernel execution.

CVSS severity8.8
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in the btrfs inode cache in Linux allows remote authenticated users to crash the kernel through file I/O on affected volumes. The cached-inode path in btrfs_fill_inode skips btrfs_set_inode_mapping_order, leaving a 4K folio order for an 8K block size. The documented reproducer requires an 8K btrfs block size, a 4K page size, writable files, and eviction and reload of a cached inode; the resulting assertion aborts kernel execution.

The record

CVE
CVE-2026-80734
Published
Sep 3, 2026
Updated
Sep 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 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=6.14.6 <6.15
  2. Affected versionversion=6.15
  3. Affected versionversion=ae584726e6eddf6cfbe49b3f4a78b3197716b6f8
  4. Affected versionversion=ecde48a1a6b3256bd49db8780bf37556b157783c <0d26249671171ab759cb4fdce673554a690fa655
  5. Affected versionversion=ecde48a1a6b3256bd49db8780bf37556b157783c <0ef349734a93227b45f65fc50a3311d1cc5f03e9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.14.6 <6.15; version=6.15; version=ae584726e6eddf6cfbe49b3f4a78b3197716b6f8; version=ecde48a1a6b3256bd49db8780bf37556b157783c <0d26249671171ab759cb4fdce673554a690fa655; version=ecde48a1a6b3256bd49db8780bf37556b157783c <0ef349734a93227b45f65fc50a3311d1cc5f03e9

Published CVSS scores

8.8LinuxCVSS:3.1/AV:N/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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