Kernel: use after free in vcs_read in drivers/tty/vt/vc_screen.c due to race

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Summary

CVECVE-2023-3567
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-07-24 16:15:12 UTC
Updated2026-11-07 12:17:31 UTC
DescriptionA use-after-free flaw was found in vcs_read in drivers/tty/vt/vc_screen.c in vc_screen in the Linux Kernel. This issue may allow an attacker with local user access to cause a system crash or leak internal kernel information.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

EPSS: 0.004190000 probability, percentile 0.364960000 (date 2026-11-08)

Problem Types: CWE-416 | CWE-416 Use After Free

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1CNACVSS7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Canonical Ubuntu Linux 14.04 All All All
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Canonical Ubuntu Linux 18.04 All All All
Operating System Canonical Ubuntu Linux 20.04 All All All
Operating System Canonical Ubuntu Linux 22.04 All All All
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel 6.2.0 rc1 All All
Operating System Linux Linux Kernel 6.2.0 rc2 All All
Operating System Linux Linux Kernel 6.2.0 rc3 All All
Operating System Linux Linux Kernel 6.2.0 rc4 All All
Operating System Linux Linux Kernel 6.2.0 rc5 All All
Operating System Linux Linux Kernel 6.2.0 rc6 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 8 unaffected 0:4.18.0-553.rt7.342.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:4.18.0-553.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support unaffected 0:4.18.0-372.87.1.el8_6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support unaffected 0:4.18.0-477.43.1.el8_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:5.14.0-427.13.1.el9_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:5.14.0-427.13.1.el9_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support unaffected 0:5.14.0-70.85.1.el9_0 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support unaffected 0:5.14.0-70.85.1.rt21.156.el9_0 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support unaffected 0:5.14.0-284.48.1.el9_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support unaffected 0:5.14.0-284.48.1.rt14.333.el9_2 * rpm Not specified
CNA Red Hat Red Hat Virtualization 4 For Red Hat Enterprise Linux 8 unaffected 0:4.18.0-372.87.1.el8_6 * 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 9 Not specified Not specified

References

ReferenceSourceLinkTags
Kernel Live Patch Security Notice LSN-0098-1 ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
2221463 – (CVE-2023-3567) CVE-2023-3567 kernel: use after free in vcs_read in drivers/tty/vt/vc_screen.c due to race af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Third Party Advisory
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
cve-details af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Patch "vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF" has been added to the 6.1-stable tree — Linux Stable Commits af854a3a-2127-422b-91ae-364da2661108 www.spinics.net Mailing List, Patch
access.redhat.com/errata/RHSA-2024:3138 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:2950 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:2394 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Kernel Live Patch Security Notice LSN-0099-1 ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2023-04-13T00:00:00.000ZReported to Red Hat.
CNA2023-01-14T00:00:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Legacy QID Mappings

  • 199775 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6341-1)
  • 242759 Red Hat Update for kernel (RHSA-2024:0432)
  • 242789 Red Hat Update for kernel (RHSA-2024:0575)
  • 242845 Red Hat Update for kernel (RHSA-2024:0448)
  • 242846 Red Hat Update for kernel-rt (RHSA-2024:0439)
  • 242847 Red Hat Update for kernel-rt (RHSA-2024:0431)
  • 242855 Red Hat Update for kernel (RHSA-2024:0412)
  • 356753 Amazon Linux Security Advisory for kernel : ALAS2-2023-2359
  • 356782 Amazon Linux Security Advisory for kernel : ALAS-2023-1897
  • 379043 Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX3-SA-2023:0136)
  • 379435 Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX2-SA-2024:0012)
  • 673354 EulerOS Security Update for kernel (EulerOS-SA-2023-2843)
  • 673496 EulerOS Security Update for kernel (EulerOS-SA-2023-2860)
  • 754275 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3309-1)
  • 754281 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3349-1)
  • 754829 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 24 for SLE 15 SP3) (SUSE-SU-2023:3594-1)
  • 754830 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 36 for SLE 15 SP1) (SUSE-SU-2023:3596-1)
  • 754831 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 27 for SLE 15 SP3) (SUSE-SU-2023:3595-1)
  • 754834 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 25 for SLE 15 SP3) (SUSE-SU-2023:3607-1)
  • 754835 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 37 for SLE 15 SP1) (SUSE-SU-2023:3603-1)
  • 754838 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 38 for SLE 15 SP2) (SUSE-SU-2023:3622-1)
  • 754839 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 37 for SLE 15 SP2) (SUSE-SU-2023:3621-1)
  • 754840 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 36 for SLE 15 SP2) (SUSE-SU-2023:3620-1)
  • 754841 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 29 for SLE 15 SP3) (SUSE-SU-2023:3623-1)
  • 754842 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 35 for SLE 15 SP2) (SUSE-SU-2023:3612-1)
  • 754844 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 32 for SLE 15 SP3) (SUSE-SU-2023:3628-1)
  • 754845 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 30 for SLE 15 SP3) (SUSE-SU-2023:3627-1)
  • 754846 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 34 for SLE 15 SP3) (SUSE-SU-2023:3632-1)
  • 754847 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 33 for SLE 15 SP3) (SUSE-SU-2023:3631-1)
  • 754848 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 0 for SLE 15 SP5) (SUSE-SU-2023:3630-1)
  • 754854 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 8 for SLE 15 SP4) (SUSE-SU-2023:3644-1)
  • 754873 SUSE Enterprise Linux Security Update for the Linux Kernel RT (Live Patch 0 for SLE 15 SP5) (SUSE-SU-2023:3671-1)

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