CVE-2026-80546

Kernel code execution via unchecked CPRB lengths

Published Aug 26, 2026 · Updated Aug 27, 2026

Integer overflow in Linux kernel 7.1 through 7.1.9 allows local users to corrupt kernel memory through crafted zcrypt ioctls. xcrb_msg_to_type6cprb_msgx aligns signed lengths, sums control and data sizes without overflow checks, and reads CPRBX fields before confirming the userspace buffer is large enough. Access to the s390 zcrypt character device is required; successful corruption enables kernel-level code execution or data disclosure and can crash the system.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux kernel 7.1 through 7.1.9 allows local users to corrupt kernel memory through crafted zcrypt ioctls. xcrb_msg_to_type6cprb_msgx aligns signed lengths, sums control and data sizes without overflow checks, and reads CPRBX fields before confirming the userspace buffer is large enough. Access to the s390 zcrypt character device is required; successful corruption enables kernel-level code execution or data disclosure and can crash the system.

The record

CVE
CVE-2026-80546
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=7.1
  2. Affected versionversion=e2c6d91eb8b1533753755f07803e47eceed263d0 <35ac6754ba6da45fd193f5ce3f665f7490b830d5
  3. Affected versionversion=e2c6d91eb8b1533753755f07803e47eceed263d0 <50fe5133dcb46449daf2435fa705264364411129

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=7.1; version=e2c6d91eb8b1533753755f07803e47eceed263d0 <35ac6754ba6da45fd193f5ce3f665f7490b830d5; version=e2c6d91eb8b1533753755f07803e47eceed263d0 <50fe5133dcb46449daf2435fa705264364411129

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.1Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1068Exploitation for Privilege Escalation

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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