Kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags

Summary

CVE	CVE-2023-3812
State	PUBLISHED
Assigner	redhat
Source Priority	CVE Program / NVD first with legacy fallback
Published	2023-07-24 16:15:13 UTC
Updated	2026-11-07 14:16:55 UTC
Description	An out-of-bounds memory access flaw was found in the Linux kernel’s TUN/TAP device driver functionality in how a user generates a malicious (too big) networking packet when napi frags is enabled. This flaw allows a local user to crash or potentially escalate their privileges on the system.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-787 | CWE-416 | CWE-787 Out-of-bounds Write

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
3.1	[email protected]	Secondary	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
3.1	CNA	CVSS	7.8	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`

CVSS v3.1 Breakdown

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

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

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Linux	Linux Kernel	All	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Red Hat	Red Hat Enterprise Linux 8	unaffected 0:4.18.0-513.9.1.rt7.311.el8_9 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8	unaffected 0:4.18.0-513.9.1.el8_9 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.1 Update Services For SAP Solutions	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.1 Update Services For SAP Solutions	unaffected 0:4.18.0-147.94.1.el8_1 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.2 Advanced Update Support	unaffected 0:4.18.0-193.133.1.el8_2 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.2 Telecommunications Update Service	unaffected 0:4.18.0-193.133.1.rt13.184.el8_2 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.2 Telecommunications Update Service	unaffected 0:4.18.0-193.133.1.el8_2 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.2 Update Services For SAP Solutions	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.2 Update Services For SAP Solutions	unaffected 0:4.18.0-193.133.1.el8_2 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	unaffected 0:4.18.0-305.120.1.el8_4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.4 Telecommunications Update Service	unaffected 0:4.18.0-305.120.1.rt7.196.el8_4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.4 Telecommunications Update Service	unaffected 0:4.18.0-305.120.1.el8_4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.4 Update Services For SAP Solutions	unaffected 0:4.18.0-305.120.1.el8_4 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.4 Update Services For SAP Solutions	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support	Not specified	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	Not specified	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 0:5.14.0-362.18.1.el9_3 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9	unaffected 0:5.14.0-362.18.1.el9_3 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.0 Extended Update Support	unaffected 0:5.14.0-70.80.1.el9_0 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.0 Extended Update Support	unaffected 0:5.14.0-70.80.1.rt21.151.el9_0 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.0 Extended Update Support	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.2 Extended Update Support	unaffected 0:5.14.0-284.40.1.el9_2 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.2 Extended Update Support	unaffected 0:5.14.0-284.40.1.rt14.325.el9_2 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9.2 Extended Update Support	Not specified	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

Reference	Source	Link	Tags
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
access.redhat.com/errata/RHSA-2024:2008	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
access.redhat.com/errata/RHSA-2024:2006	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
cve-details	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory
access.redhat.com/errata/RHSA-2023:7548	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
kernel/git/torvalds/linux.git - Linux kernel source tree	af854a3a-2127-422b-91ae-364da2661108	git.kernel.org	Patch
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
access.redhat.com/errata/RHSA-2023:7549	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
2224048 – (CVE-2023-3812) CVE-2023-3812 kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags	af854a3a-2127-422b-91ae-364da2661108	bugzilla.redhat.com	Issue Tracking, Patch, Third Party Advisory
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
access.redhat.com/errata/RHSA-2023:7554	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
Red Hat	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com	Third Party Advisory, VDB Entry
access.redhat.com/errata/RHSA-2024:1961	af854a3a-2127-422b-91ae-364da2661108	access.redhat.com
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Source	Time	Event
CNA	2023-07-19T00:00:00.000Z	Reported to Red Hat.
CNA	2022-10-22T00:00:00.000Z	Made public.

Workarounds

CNA: To mitigate this issue, prevent the tun module from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.

Legacy QID Mappings

161208 Oracle Enterprise Linux Security Update for kernel (ELSA-2023-7549)
161318 Oracle Enterprise Linux Security Update for kernel (ELSA-2024-12094)
161404 Oracle Enterprise Linux Security Update for kernel (ELSA-2024-0461)
242340 Red Hat Update for kpatch-patch (RHSA-2023:6799)
242343 Red Hat Update for kernel (RHSA-2023:6813)
242481 Red Hat Update for kernel (RHSA-2023:7382)
242482 Red Hat Update for kernel-rt (RHSA-2023:7379)
242483 Red Hat Update for kernel-rt (RHSA-2023:7389)
242489 Red Hat Update for kpatch-patch (RHSA-2023:7411)
242497 Red Hat Update for kpatch-patch (RHSA-2023:7418)
242516 Red Hat Update for kernel (RHSA-2023:7549)
242522 Red Hat Update for kpatch-patch (RHSA-2023:7554)
242526 Red Hat Update for kernel-rt (RHSA-2023:7548)
242612 Red Hat Update for kernel security (RHSA-2023:7370)
242727 Red Hat Update for kpatch-patch (RHSA-2024:0340)
242728 Red Hat Update for kpatch-patch (RHSA-2024:0378)
242769 Red Hat Update for kpatch-patch (RHSA-2024:0554)
242785 Red Hat Update for kpatch-patch (RHSA-2024:0593)
242789 Red Hat Update for kernel (RHSA-2024:0575)
242830 Red Hat Update for kernel-rt (RHSA-2024:0563)
242831 Red Hat Update for kernel (RHSA-2024:0562)
242839 Red Hat Update for kernel (RHSA-2024:0461)
242855 Red Hat Update for kernel (RHSA-2024:0412)
378889 Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX2-SA-2023:0036)
378892 Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX3-SA-2023:0114)
379043 Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX3-SA-2023:0136)
754863 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:3680-1)
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)
754920 SUSE Enterprise Linux Security Update for the Linux Kernel RT (Live Patch 0 for SLE 15 SP5) (SUSE-SU-2023:3772-1)
754921 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 39 for SLE 15 SP1) (SUSE-SU-2023:3768-1)
754923 SUSE Enterprise Linux Security Update for the Linux Kernel RT (Live Patch 6 for SLE 15 SP4) (SUSE-SU-2023:3783-1)
754924 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 37 for SLE 15 SP1) (SUSE-SU-2023:3786-1)
754927 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 31 for SLE 15 SP2) (SUSE-SU-2023:3788-1)
754939 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 30 for SLE 15 SP2) (SUSE-SU-2023:3812-1)
754940 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 43 for SLE 15 SP1) (SUSE-SU-2023:3811-1)
754941 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 42 for SLE 15 SP1) (SUSE-SU-2023:3809-1)
754947 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 33 for SLE 15 SP2) (SUSE-SU-2023:3844-1)
754948 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 40 for SLE 15 SP1) (SUSE-SU-2023:3838-1)
754976 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 36 for SLE 15 SP2) (SUSE-SU-2023:3846-1)
754990 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 23 for SLE 15 SP3) (SUSE-SU-2023:3892-1)
754992 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 38 for SLE 15 SP2) (SUSE-SU-2023:3889-1)
754993 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 32 for SLE 15 SP2) (SUSE-SU-2023:3893-1)
755006 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 26 for SLE 15 SP3) (SUSE-SU-2023:3928-1)
941482 AlmaLinux Security Update for kernel (ALSA-2023:7549)
961087 Rocky Linux Security Update for kernel-rt (RLSA-2023:7548)
961089 Rocky Linux Security Update for kernel (RLSA-2023:7549)