CVE-2026-72215

Kernel hang via 64-bit prom_printf stack

Published Aug 15, 2026 · Updated Aug 15, 2026

Incorrect numeric conversion in Linux kernel MIPS DEC builds allows local users to hang the kernel via an o32 prom_printf() call. The o32 wrapper passes an XKPHYS 64-bit stack pointer to 32-bit firmware, whose 32-bit ALU operations produce an invalid stack address and divert control. Reachability requires a 64-bit DEC configuration where the initial console remains active after other kernel threads start; the result is a boot hang.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect numeric conversion in Linux kernel MIPS DEC builds allows local users to hang the kernel via an o32 prom_printf() call. The o32 wrapper passes an XKPHYS 64-bit stack pointer to 32-bit firmware, whose 32-bit ALU operations produce an invalid stack address and divert control. Reachability requires a 64-bit DEC configuration where the initial console remains active after other kernel threads start; the result is a boot hang.

The record

CVE
CVE-2026-72215
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-681, T1499.004
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1ed18b5c3be9657fe288fa4dae0bef2470598683
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <27857db30c98583e12dd8d939ba2370bce08a5be
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3394757c5d3970ab36d2aafa6dd40952b43f0d16
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3ae86630b94f72bf4012c6322f81f622dc4fdf24
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ff79e8bdc75db51e30298a75939e2308e7658e0
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9cd4a8ed12d2a6313592e43c14cca5eca6717bee
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3fd2d358df0ca712183509cbbed6a16bde1d17e
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d828bca84311e278093e60b2864a54f4bbb0c2ad
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1ed18b5c3be9657fe288fa4dae0bef2470598683; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <27857db30c98583e12dd8d939ba2370bce08a5be; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3394757c5d3970ab36d2aafa6dd40952b43f0d16; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3ae86630b94f72bf4012c6322f81f622dc4fdf24; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ff79e8bdc75db51e30298a75939e2308e7658e0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9cd4a8ed12d2a6313592e43c14cca5eca6717bee; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3fd2d358df0ca712183509cbbed6a16bde1d17e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d828bca84311e278093e60b2864a54f4bbb0c2ad; version=2.6.12

Published CVSS scores

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-681Incorrect Conversion between Numeric Types
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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