Kernel: tap: tap_open(): correctly initialize socket uid next fix of i_uid to current_fsuid

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Summary

CVECVE-2023-4194
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-08-07 14:15:11 UTC
Updated2026-11-07 12:17:37 UTC
DescriptionA flaw was found in the Linux kernel's TUN/TAP functionality. This issue could allow a local user to bypass network filters and gain unauthorized access to some resources. The original patches fixing CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits - a096ccca6e50 ("tun: tun_chr_open(): correctly initialize socket uid"), - 66b2c338adce ("tap: tap_open(): correctly initialize socket uid"), pass "inode->i_uid" to sock_init_data_uid() as the last parameter and that turns out to not be accurate.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.002670000 probability, percentile 0.189810000 (date 2026-11-08)

Problem Types: CWE-843 | CWE-863 | CWE-843 Access of Resource Using Incompatible Type

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
3.1[email protected]Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
3.1CNACVSS5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 11.0 All All All
Operating System Debian Debian Linux 12.0 All All All
Operating System Fedoraproject Fedora 37 All All All
Operating System Fedoraproject Fedora 38 All All All
Operating System Linux Linux Kernel 6.5 rc1 All All
Operating System Linux Linux Kernel 6.5 rc2 All All
Operating System Linux Linux Kernel 6.5 rc3 All All
Operating System Linux Linux Kernel 6.5 rc4 All All
Operating System Linux Linux Kernel All All All All
Operating System Redhat Enterprise Linux 8.0 All All All
Operating System Redhat Enterprise Linux 9.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:5.14.0-362.8.1.el9_3 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:5.14.0-362.8.1.el9_3 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 9 Not specified Not specified
CNA Red Hat Red Hat Virtualization 4 Not specified Not specified

References

ReferenceSourceLinkTags
Debian -- Security Information -- DSA-5492-1 linux af854a3a-2127-422b-91ae-364da2661108 www.debian.org
August 2023 Linux Kernel 6.5-rc5 Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
[PATCH 2/2] net: tap_open(): set sk_uid from current_fsuid() - Laszlo Ersek af854a3a-2127-422b-91ae-364da2661108 lore.kernel.org Mailing List, Patch, Vendor Advisory
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
[SECURITY] [DLA 3623-1] linux-5.10 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
2229498 – (CVE-2023-4194) CVE-2023-4194 kernel: tap: tap_open(): correctly initialize socket uid next fix of i_uid to current_fsuid af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Third Party Advisory
Debian -- Security Information -- DSA-5480-1 linux af854a3a-2127-422b-91ae-364da2661108 www.debian.org
[SECURITY] Fedora 37 Update: kernel-6.4.10-100.fc37 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[SECURITY] Fedora 38 Update: kernel-6.4.10-200.fc38 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[PATCH 1/2] net: tun_chr_open(): set sk_uid from current_fsuid() - Laszlo Ersek af854a3a-2127-422b-91ae-364da2661108 lore.kernel.org Mailing List, Patch, Vendor Advisory
[PATCH 0/2] tun/tap: set sk_uid from current_fsuid() - Laszlo Ersek af854a3a-2127-422b-91ae-364da2661108 lore.kernel.org Mailing List, Patch, Vendor Advisory
cve-details af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: This issue was discovered by Laszlo Ersek (Red Hat). (en)

Additional Advisory Data

SourceTimeEvent
CNA2023-08-06T00:00:00.000ZReported to Red Hat.
CNA2023-08-03T00:00:00.000ZMade public.

Legacy QID Mappings

  • 161066 Oracle Enterprise Linux Security Update for kernel (ELSA-2023-6583)
  • 199764 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-6385-1)
  • 199804 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6417-1)
  • 199809 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6416-1)
  • 199810 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6412-1)
  • 199814 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6416-2)
  • 199840 Ubuntu Security Notification for Linux kernel (Raspberry Pi) Vulnerabilities (USN-6416-3)
  • 199844 Ubuntu Security Notification for Linux kernel (Intel IoTG) Vulnerabilities (USN-6445-1)
  • 199858 Ubuntu Security Notification for Linux kernel (Intel IoTG) Vulnerabilities (USN-6445-2)
  • 199883 Ubuntu Security Notification for Linux kernel (NVIDIA) Vulnerabilities (USN-6466-1)
  • 242399 Red Hat Update for kernel security (RHSA-2023:6583)
  • 284396 Fedora Security Update for kernel (FEDORA-2023-d9509be489)
  • 284399 Fedora Security Update for kernel (FEDORA-2023-ee241dcf80)
  • 355864 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2023-051
  • 356578 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2023-054
  • 6000212 Debian Security Update for linux (DSA 5480-1)
  • 6000220 Debian Security Update for linux (DSA 5492-1)
  • 6000265 Debian Security Update for linux-5.10 (DLA 3623-1)
  • 673406 EulerOS Security Update for kernel (EulerOS-SA-2023-3182)
  • 673449 EulerOS Security Update for kernel (EulerOS-SA-2023-2898)
  • 673484 EulerOS Security Update for kernel (EulerOS-SA-2023-3033)
  • 673498 EulerOS Security Update for kernel (EulerOS-SA-2023-3132)
  • 673732 EulerOS Security Update for kernel (EulerOS-SA-2023-3010)
  • 673848 EulerOS Security Update for kernel (EulerOS-SA-2023-3217)
  • 673970 EulerOS Security Update for kernel (EulerOS-SA-2023-2879)
  • 754832 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3600-1)
  • 754833 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3599-1)
  • 754855 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3656-1)
  • 754866 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3684-1)
  • 754867 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3683-1)
  • 754868 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3682-1)
  • 754869 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3681-1)
  • 754883 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3705-1)
  • 754884 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3704-1)
  • 754899 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3599-2)
  • 754900 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3600-2)
  • 754901 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3704-2)
  • 754903 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3683-2)
  • 755026 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3964-1)
  • 755037 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3971-1)
  • 755038 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3969-1)
  • 755043 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3988-1)

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