CVE-2026-74350

Kernel crash via malformed OCFS2 fast symlink

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds read in Linux 3.5 through 7.1.4 allows local users to crash the kernel through a malformed OCFS2 fast symlink. ocfs2_fast_symlink_read_folio() uses strnlen() on an unchecked inline payload, then copies len + 1 bytes beyond the inode block buffer when i_size exceeds capacity or lacks a NUL at that offset. Triggering requires access to place a corrupt symlink dinode on a mounted OCFS2 volume and read the link; the confirmed consequence is a kernel memory fault and service crash.

CVSS severity9.8
Critical
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux 3.5 through 7.1.4 allows local users to crash the kernel through a malformed OCFS2 fast symlink. ocfs2_fast_symlink_read_folio() uses strnlen() on an unchecked inline payload, then copies len + 1 bytes beyond the inode block buffer when i_size exceeds capacity or lacks a NUL at that offset. Triggering requires access to place a corrupt symlink dinode on a mounted OCFS2 volume and read the link; the confirmed consequence is a kernel memory fault and service crash.

The record

CVE
CVE-2026-74350
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=3.5
  2. Affected versionversion=ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1 <e234973f286ed2e8961a24561ec91594ec3e3ff8
  3. Affected versionversion=ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1 <f9e2cb692b77a679b1f4cc2b7b277fa908586533

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1 <e234973f286ed2e8961a24561ec91594ec3e3ff8; version=ea022dfb3c2a4680483b00eb2fecc9fc4f6091d1 <f9e2cb692b77a679b1f4cc2b7b277fa908586533

Published CVSS scores

9.8Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-125Out-of-bounds Read

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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