7.8

CVE-2023-6817: Use-after-free in Linux kernel's netfilter: nf_tables component

Modified
AliasesUBUNTU-CVE-2023-6817DEBIAN-CVE-2023-6817
Published 18-12-2023Last modified 14-10-2026

Vulnerability summary

CVE-2023-6817 is a high (CVSS 7.8) Use After Free vulnerability in linux kernel. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 26.7% 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
0.33%
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 37 · Related 18
DLA-3711-1DSA-5593-1DSA-5594-1LSN-0100-1LSN-0101-1LSN-0103-1

Timeline

  1. 18-12-2023
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The function nft_pipapo_walk did not skip inactive elements during set walk which could lead double deactivations of PIPAPO (Pile Packet Policies) elements, leading to use-after-free. We recommend upgrading past commit 317eb9685095678f2c9f5a8189de698c5354316a.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.33% 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.

Ubuntu102 products
  • linux< 5.15.0-92.102
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1052.57
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • kernel≥ 5.6, < 6.7
  • linux_kernel≥ 5.6, < 5.10.204 | ≥ 5.11, < 5.15.143 | ≥ 5.16, < 6.1.68 | ≥ 6.2, < 6.6.7 | 6.7:rc1 | 6.7:rc2 | 6.7:rc3 | 6.7:rc4
Debian1 product
  • linux< 6.1.69-1 | < 6.6.8-1

3 vendors · 105 products

References

24 links
Show all 24 references