CVE-2026-72033

Kernel crash via truncated directory entry size

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds read in OrangeFS in affected Linux kernels allows local users to crash the kernel via a crafted directory entry. The fill_from_part() function truncates a size_t entry length into __u32, letting a value near U32_MAX wrap and pass a bounds check before indexing beyond the directory part. Reachability requires a malicious OrangeFS userspace client to supply the trailer; successful triggering causes a kernel oops and interrupts the host.

CVSS severity9.8
Critical
EPSS probability0.74%
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 OrangeFS in affected Linux kernels allows local users to crash the kernel via a crafted directory entry. The fill_from_part() function truncates a size_t entry length into __u32, letting a value near U32_MAX wrap and pass a bounds check before indexing beyond the directory part. Reachability requires a malicious OrangeFS userspace client to supply the trailer; successful triggering causes a kernel oops and interrupts the host.

The record

CVE
CVE-2026-72033
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
Unavailable

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=4.12
  2. Affected versionversion=480e3e532e31666a18520a7964bb4095d7a16b9a <07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9
  3. Affected versionversion=480e3e532e31666a18520a7964bb4095d7a16b9a <1679780f482feeb82acb5995587d4fb1d1fe82fd
  4. Affected versionversion=480e3e532e31666a18520a7964bb4095d7a16b9a <18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc
  5. Affected versionversion=480e3e532e31666a18520a7964bb4095d7a16b9a <36723b28e3293047f087f4501f1ef4ead418dd84
  6. Affected versionversion=480e3e532e31666a18520a7964bb4095d7a16b9a <82fc886e244c76fadf05ef1958aaf8815478ccde
  7. Affected versionversion=480e3e532e31666a18520a7964bb4095d7a16b9a <a72bbb43689591c9d36e3bb45c2d4e688cf92682
  8. Affected versionversion=480e3e532e31666a18520a7964bb4095d7a16b9a <e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729
  9. Affected versionversion=480e3e532e31666a18520a7964bb4095d7a16b9a <fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=480e3e532e31666a18520a7964bb4095d7a16b9a <07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9; version=480e3e532e31666a18520a7964bb4095d7a16b9a <1679780f482feeb82acb5995587d4fb1d1fe82fd; version=480e3e532e31666a18520a7964bb4095d7a16b9a <18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc; version=480e3e532e31666a18520a7964bb4095d7a16b9a <36723b28e3293047f087f4501f1ef4ead418dd84; version=480e3e532e31666a18520a7964bb4095d7a16b9a <82fc886e244c76fadf05ef1958aaf8815478ccde; version=480e3e532e31666a18520a7964bb4095d7a16b9a <a72bbb43689591c9d36e3bb45c2d4e688cf92682; version=480e3e532e31666a18520a7964bb4095d7a16b9a <e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729; version=480e3e532e31666a18520a7964bb4095d7a16b9a <fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1

Published CVSS scores

9.8Linux Kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS: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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application 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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