Integer Overflow Vulnerability in Cockpit Affects User Login Records
CVE-2026-91142

3.6LOW

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Vendor
CVE Published:
18 September 2026

What is CVE-2026-91142?

A flaw in Cockpit's do_lastlog() function allows a low-privileged authenticated user to exploit an integer overflow in the offset calculation for lastlog entries. When executed on ILP32 (Integer, Long, Pointer 32-bit) environments, this vulnerability can be triggered with a specially crafted large User ID (UID). As a result, the calculated offset may wrap around, enabling unauthorized access to read and write operations on other users' lastlog records. This flaw poses a risk of disclosing or altering sensitive login accounting information, potentially impacting user privacy and security.

References

https://access.redhat.com/security/cve/CVE-2026-91142
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2479459
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
3.6
Severity:
LOW
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Found by AISLE in partnership with Red Hat.
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