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RHEL 9 : gvisor-tap-vsock (RHSA-2026:28038)

medium Nessus Plugin ID 322148

Synopsis

The remote Red Hat host is missing one or more security updates for gvisor-tap-vsock.

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:28038 advisory.

 A replacement for libslirp and VPNKit, written in pure Go. It is based on the network stack of gVisor.
 Compared to libslirp, gvisor-tap-vsock brings a configurable DNS server and dynamic port forwarding.

 Security Fix(es):

 * crypto/x509: Incorrect enforcement of email constraints in crypto/x509 (CVE-2026-27137)

 * golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282)

 * crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283)

 * crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)

 For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL gvisor-tap-vsock package based on the guidance in RHSA-2026:28038.

See Also

https://access.redhat.com/errata/RHSA-2026:28038

https://access.redhat.com/security/updates/classification/#important

https://bugzilla.redhat.com/show_bug.cgi?id=2445345

https://bugzilla.redhat.com/show_bug.cgi?id=2456336

https://bugzilla.redhat.com/show_bug.cgi?id=2456338

https://bugzilla.redhat.com/show_bug.cgi?id=2456339

http://www.nessus.org/u?b0c2ea02

Plugin Details

Severity: Medium

ID: 322148

File Name: redhat-RHSA-2026-28038.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/23/2026

Updated: 6/23/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 4.4

Vector: CVSS2#AV:L/AC:H/Au:M/C:C/I:C/A:C

CVSS Score Source: CVE-2026-32282

CVSS v3

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.6

Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:gvisor-tap-vsock-gvforwarder, p-cpe:/a:redhat:enterprise_linux:gvisor-tap-vsock, cpe:/o:redhat:rhel_eus:9.6

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 6/22/2026

Vulnerability Publication Date: 3/5/2026

Reference Information

CVE: CVE-2026-27137, CVE-2026-32280, CVE-2026-32282, CVE-2026-32283

CWE: 295, 367, 764, 770

RHSA: 2026:28038