7.8

CVE-2023-3812: Kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags

Modified
AliasesRHSA-2024:1961UBUNTU-CVE-2023-3812DEBIAN-CVE-2023-3812
Published 24-07-2023Last modified 26-02-2026

Vulnerability summary

CVE-2023-3812 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux linux_kernel. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 27.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.34%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 52 · Related 30
RHSA-2023:6799RHSA-2023:6813RHSA-2023:7370RHSA-2023:7379RHSA-2023:7382RHSA-2023:7389

Timeline

  1. 24-07-2023
    PublishedVulnerability first disclosed.
  2. 26-02-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

28%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.34% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu90 products
  • linux< 4.15.0-206.217 | < 5.4.0-139.156 | < 5.15.0-60.66
  • linux-aws< 4.15.0-1151.164 | < 5.4.0-1096.104 | < 5.15.0-1030.34
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
  • linux-aws-5.13All versions (No fix recorded)
Redhat10 products
  • enterprise_linux8.0 | 9.0
  • kpatch-patch-4_18_0-193_116_1< 0:1-4.el8_2
  • kpatch-patch-4_18_0-193_116_1-debuginfo< 0:1-4.el8_2
  • kpatch-patch-4_18_0-193_116_1-debugsource< 0:1-4.el8_2
  • kpatch-patch-4_18_0-193_119_1< 0:1-3.el8_2
Debian1 product
  • linux< 6.0.8-1
Linux1 product
  • linux_kernel≥ 4.15, < 4.19.265 | ≥ 4.20, < 5.4.224 | ≥ 5.5, < 5.10.154 | ≥ 5.11, < 5.15.78 | ≥ 5.16, < 6.0.8

4 vendors · 102 products

References

33 links
Show all 33 references