Public Date:
1640596: CVE-2018-18445 kernel: Faulty computation of numberic bounds in the BPF verifier
A security flaw was found in the Linux kernel in the adjust_scalar_min_max_vals() function in kernel/bpf/verifier.c. A faulty computation of numeric bounds in the BPF verifier permits out-of-bounds memory accesses because this function mishandles 32-bit right shifts. A local unprivileged user cannot leverage this flaw, but as a privileged user ("root") this can lead to a system panic and a denial of service or other unspecified impact. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.

Find out more about CVE-2018-18445 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v3 metrics

CVSS3 Base Score 4.7
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
Attack Vector Local
Attack Complexity High
Privileges Required High
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Impact Low
Availability Impact High

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (kernel) RHSA-2019:0512 2019-03-13
Red Hat Enterprise Linux for Real Time for NFV (v. 7) (kernel-rt) RHSA-2019:0514 2019-03-13

Affected Packages State

Platform Package State
Red Hat Enterprise MRG 2 kernel-rt Not affected
Red Hat Enterprise Linux 8 kernel Affected
Red Hat Enterprise Linux 8 kernel-rt Affected
Red Hat Enterprise Linux 7 kernel-alt Not affected
Red Hat Enterprise Linux 6 kernel Not affected
Red Hat Enterprise Linux 5 kernel Not affected
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.
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