EUVD-2026-83176
GHSA-2f43-vjp7-v3qj
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
ILP32-only plus admin-provisioned large-UID precondition make AC:H; low-priv authenticated (PR:L); only partial lastlog read/tamper (C:L/I:L, A:N); AV:L per vendor though AV:N is defensible for a web console.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
3DescriptionCVE.org
A flaw was found in Cockpit. An integer overflow vulnerability in the do_lastlog() function, specifically in the offset calculation for lastlog entries on ILP32 (Integer, Long, Pointer 32-bit) builds, can be exploited. A low-privileged authenticated user with a specially provisioned large User ID (UID) can cause the computed offset to wrap around. This allows the user to perform unauthorized reads and writes to other users' lastlog records, potentially disclosing or altering sensitive login accounting information.
AnalysisAI
An integer-wraparound in Cockpit's do_lastlog() login-accounting routine on ILP32 (32-bit) builds allows a low-privileged but authenticated local user holding an administrator-provisioned abnormally large UID to read and modify other users' lastlog records, producing low confidentiality and low integrity impact (CVSS 3.1 base 3.6, AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N). Exploitation requires a 32-bit build, a deliberately created large-UID account, and local access to the host; 64-bit LP64 builds do not overflow and are unaffected, and no public exploit code has been identified at time of analysis.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires all of the following: (1) an ILP32 / 32-bit build of Cockpit - 64-bit LP64 builds do not overflow and are unaffected; (2) a low-privileged but authenticated account that an administrator has provisioned with an abnormally large UID, so the 32-bit offset computation in do_lastlog() wraps; and (3) local-vector access to the affected host per the vendor's AV:L rating. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuinely low-priority issue despite being a memory-safety class (CWE-787) flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch or fixed package version is identified in the available advisory data at time of analysis; monitor https://access.redhat.com/security/cve/CVE-2026-91142 and https://bugzilla.redhat.com/show_bug.cgi?id=2479459 for the errata package version and apply it as soon as it is published. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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