7.8

CVE-2023-42753: Kernel: netfilter: potential slab-out-of-bound access due to integer underflow

Modified
AliasesRHSA-2024:0346RHSA-2024:0347RHSA-2024:0371
Published 25-09-2023Last modified 14-10-2026

Vulnerability summary

CVE-2023-42753 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 43.3% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.51%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 82 · Related 57
DLA-3623-1DLA-3710-1LSN-0099-1OPENSUSE-SU-2024:13305-1OPENSUSE-SU-2024:13704-1RHSA-2023:7370

Timeline

  1. 25-09-2023
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

An array indexing vulnerability was found in the netfilter subsystem of the Linux kernel. A missing macro could lead to a miscalculation of the `h->nets` array offset, providing attackers with the primitive to arbitrarily increment/decrement a memory buffer out-of-bound. This issue may allow a local user to crash the system or potentially escalate their privileges on the system.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.51% 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

1 found
  • referenceUnverified

    Exploit Reference (seclists.org)

    Maturity: unknown

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.

Ubuntu107 products
  • linux< 4.4.0-246.280 | < 4.15.0-219.230 | < 5.4.0-165.182 | < 5.15.0-87.97
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1124.130 | < 4.4.0-1162.177 | < 4.15.0-1162.175 | < 5.4.0-1112.121 | < 5.15.0-1048.53
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Redhat52 products
  • enterprise_linuxEOL7.0 | 8.0 | 9.0
  • bpftool< 0:3.10.0-1160.108.1.el7
  • bpftool-debuginfo< 0:3.10.0-1160.108.1.el7
  • kernel< 0:3.10.0-1160.108.1.el7
  • kernel-abi-whitelists< 0:3.10.0-1160.108.1.el7
Debian2 products
Linux1 product
  • linux_kernel≥ 4.4.165, < 4.5 | ≥ 4.9.141, < 4.10 | ≥ 4.14.84, < 4.15 | ≥ 4.19.5, < 4.19.295 | ≥ 4.20, < 5.4.257 | ≥ 5.5, < 5.10.195 | ≥ 5.11, < 5.15.132 | ≥ 5.16, < 6.1.53 | ≥ 6.2, < 6.4.16 | ≥ 6.5, < 6.5.3

4 vendors · 162 products

References

60 links
Show all 60 references