CVE-2023-3812

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

State: Published
Severity: 7.8 High
Published: Jul 24, 2023
Updated: Feb 26, 2026
Reserved: Jul 20, 2023

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	redhat

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
Red Hat Enterprise Linux 8Red Hat	0:4.18.0-513.9.1.rt7.311.el8_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:4.18.0-513.9.1.el8_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 8.1 Update Services for SAP SolutionsRed Hat
Red Hat Enterprise Linux 8.1 Update Services for SAP SolutionsRed Hat	0:4.18.0-147.94.1.el8_1 and laterNot affected
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	0:4.18.0-193.133.1.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceRed Hat	0:4.18.0-193.133.1.rt13.184.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceRed Hat	0:4.18.0-193.133.1.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsRed Hat
Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsRed Hat	0:4.18.0-193.133.1.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:4.18.0-305.120.1.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRed Hat	0:4.18.0-305.120.1.rt7.196.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRed Hat	0:4.18.0-305.120.1.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRed Hat	0:4.18.0-305.120.1.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRed Hat
Red Hat Enterprise Linux 8.6 Extended Update SupportRed Hat
Red Hat Enterprise Linux 8.6 Extended Update SupportRed Hat	0:4.18.0-372.87.1.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat	0:4.18.0-477.43.1.el8_8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:5.14.0-362.18.1.el9_3 and laterNot affected
Red Hat Enterprise Linux 9Red Hat
Red Hat Enterprise Linux 9Red Hat	0:5.14.0-362.18.1.el9_3 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	0:5.14.0-70.80.1.el9_0 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	0:5.14.0-70.80.1.rt21.151.el9_0 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat	0:5.14.0-284.40.1.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat	0:5.14.0-284.40.1.rt14.325.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8Red Hat	0:4.18.0-372.87.1.el8_6 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 9Red Hat

References

RHSA-2023:6799vendor-advisory
RHSA-2023:6813vendor-advisory
RHSA-2023:7370vendor-advisory
RHSA-2023:7379vendor-advisory
RHSA-2023:7382vendor-advisory
RHSA-2023:7389vendor-advisory
RHSA-2023:7411vendor-advisory
RHSA-2023:7418vendor-advisory
RHSA-2023:7548vendor-advisory
RHSA-2023:7549vendor-advisory
RHSA-2023:7554vendor-advisory
RHSA-2024:0340vendor-advisory
RHSA-2024:0378vendor-advisory
RHSA-2024:0412vendor-advisory
RHSA-2024:0461vendor-advisory
RHSA-2024:0554vendor-advisory
RHSA-2024:0562vendor-advisory
RHSA-2024:0563vendor-advisory
RHSA-2024:0575vendor-advisory
RHSA-2024:0593vendor-advisory
RHSA-2024:1961vendor-advisory
RHSA-2024:2006vendor-advisory
RHSA-2024:2008vendor-advisory
https://access.redhat.com/security/cve/CVE-2023-3812vdb-entry
RHBZ#2224048issue-tracking
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=363a5328f4b0

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