Buffer overflow in Linux Kernel
CVE-2023-3812
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (25.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Linux Kernel
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8 — versions 0:4.18.0-513.9.1.rt7.311.el8_9, 0:4.18.0-513.9.1.el8_9
- Red Hat Enterprise Linux 8.1 Update Services For SAP Solutions — versions 0:4.18.0-147.94.1.el8_1
- Red Hat Enterprise Linux 8.2 Advanced Update Support — versions 0:4.18.0-193.133.1.el8_2
- Red Hat Enterprise Linux 8.2 Telecommunications Update Service — versions 0:4.18.0-193.133.1.rt13.184.el8_2, 0:4.18.0-193.133.1.el8_2
- Red Hat Enterprise Linux 8.2 Update Services For SAP Solutions — versions 0:4.18.0-193.133.1.el8_2
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support — versions 0:4.18.0-305.120.1.el8_4
- Red Hat Enterprise Linux 8.4 Telecommunications Update Service — versions 0:4.18.0-305.120.1.rt7.196.el8_4, 0:4.18.0-305.120.1.el8_4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/errata/RHSA-2023:6799 (vendor-advisory, VDB Entry, Third Party Advisory)
- access.redhat.com/errata/RHSA-2023:6813 (vendor-advisory, VDB Entry, Third Party Advisory)
- access.redhat.com/errata/RHSA-2023:7370 (vendor-advisory, VDB Entry, Third Party Advisory)
- access.redhat.com/errata/RHSA-2023:7379 (vendor-advisory, VDB Entry, Third Party Advisory)
- access.redhat.com/errata/RHSA-2023:7382 (vendor-advisory, VDB Entry, Third Party Advisory)
- access.redhat.com/errata/RHSA-2023:7389 (vendor-advisory, VDB Entry, Third Party Advisory)
- access.redhat.com/errata/RHSA-2023:7411 (vendor-advisory, VDB Entry, Third Party Advisory)
- access.redhat.com/errata/RHSA-2023:7418 (vendor-advisory, VDB Entry, Third Party Advisory)
- access.redhat.com/errata/RHSA-2023:7548 (vendor-advisory, VDB Entry, Third Party Advisory)
- access.redhat.com/errata/RHSA-2023:7549 (vendor-advisory, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-3812?
- CVE-2023-3812 is a high-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2023-07-24.
- How severe is CVE-2023-3812?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2023-3812 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.