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Vulnerability · Published Sep 18, 2026 · Assigned by redhat

CVE-2026-91142Cockpit: cockpit: unauthorized modification of login records via integer overflow

Low 3.6

In plain English

A low-severity integer overflow in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.6Low
Exploit odds (30 days)0.1%top 98.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in Cockpit. An authenticated local user with a large user identifier (UID) can cause unauthorized modification and disclosure of login records. On 32-bit systems, an integer overflow during session accounting allows the user's login process to read or overwrite the legacy log entries of other accounts.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12cockpitno fix listedDEBIAN-CVE-2026-91142
Debian:13cockpitno fix listedDEBIAN-CVE-2026-91142
Debian:14cockpit368-1DEBIAN-CVE-2026-91142
Ubuntu:22.04:LTScockpitno fix listedUBUNTU-CVE-2026-91142
Ubuntu:24.04:LTScockpitno fix listedUBUNTU-CVE-2026-91142
Ubuntu:26.04:LTScockpitno fix listedUBUNTU-CVE-2026-91142
Ubuntu:26.10cockpitno fix listedUBUNTU-CVE-2026-91142

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Dev Spaces see references
Red Hat Red Hat OpenShift Dev Spaces see references
Red Hat Red Hat OpenShift Dev Spaces see references

Weakness: CWE-190 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

References