CVE-2026-89786Public exploitHinoki check available

Kernel memory fault via ext4 inline directory

Published Sep 16, 2026 · Updated Sep 16, 2026

Out-of-bounds read in Linux ext4 directory iteration allows attackers to trigger a kernel memory fault via a crafted inline directory. ext4_read_inline_dir() calculates positions in a logical space larger than its allocated inline buffer and dereferences a directory-entry header before confirming that the header fits. Reaching the flaw requires the kernel to read a crafted or corrupted inline ext4 directory; the demonstrated consequence is a memory-safety fault during getdents64(), while data disclosure has not been established.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds read in Linux ext4 directory iteration allows attackers to trigger a kernel memory fault via a crafted inline directory. ext4_read_inline_dir() calculates positions in a logical space larger than its allocated inline buffer and dereferences a directory-entry header before confirming that the header fits. Reaching the flaw requires the kernel to read a crafted or corrupted inline ext4 directory; the demonstrated consequence is a memory-safety fault during getdents64(), while data disclosure has not been established.

The record

CVE
CVE-2026-89786
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=3.10
  2. Affected versionversion=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <1a1dea633b724a1c042dbcdb1fed27f410916688
  3. Affected versionversion=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <36bf17bb90cdf7a623499b624b05acde4d2feef5
  4. Affected versionversion=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <5fd20d4e50dd6e460b3ea8e4396f8553d4526f8f
  5. Affected versionversion=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <6702c7da86d8cdb88d0fc57166286e115ffeb8c0
  6. Affected versionversion=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <9333cc809f0a89e001b814155a6cb8903a6274df
  7. Affected versionversion=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <b060861f662d4826dc700a1c3584243bb3474cfe
  8. Affected versionversion=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <d1e7c186555ad65554fd2f2b02f5a539aa35ae48

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.10; version=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <1a1dea633b724a1c042dbcdb1fed27f410916688; version=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <36bf17bb90cdf7a623499b624b05acde4d2feef5; version=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <5fd20d4e50dd6e460b3ea8e4396f8553d4526f8f; version=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <6702c7da86d8cdb88d0fc57166286e115ffeb8c0; version=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <9333cc809f0a89e001b814155a6cb8903a6274df; version=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <b060861f662d4826dc700a1c3584243bb3474cfe; version=c4d8b0235aa98f8c26bf94d308be3fdd24154572 <d1e7c186555ad65554fd2f2b02f5a539aa35ae48

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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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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