7.8

CVE-2023-4004: Kernel: netfilter: use-after-free due to improper element removal in nft_pipapo_remove()

Modified
AliasesUBUNTU-CVE-2023-4004DEBIAN-CVE-2023-4004
Published 31-07-2023Last modified 14-10-2026

Vulnerability summary

CVE-2023-4004 is a high (CVSS 7.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 60.2% 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
0.92%
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 53 · Related 29
DLA-3623-1DSA-5480-1DSA-5492-1LSN-0098-1LSN-0099-1MGASA-2023-0250

Timeline

  1. 31-07-2023
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

A use-after-free flaw was found in the Linux kernel's netfilter in the way a user triggers the nft_pipapo_remove function with the element, without a NFT_SET_EXT_KEY_END. This issue could allow a local user to crash the system or potentially escalate their privileges on the system.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.92%

Chance of exploitation in the next 30 days

Percentile

60%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.92% 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.

Ubuntu89 products
  • linux< 5.15.0-82.91
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1043.48
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Netapp4 products
Debian2 products
  • linux< 6.1.52-1 | < 6.4.11-1
  • debian_linuxEOL10.0 | 11.0 | 12.0
Fedoraproject1 product
Linux1 product
  • linux_kernel≥ 5.6, < 5.10.188 | ≥ 5.11, < 5.15.123 | ≥ 5.16, < 6.1.42 | ≥ 6.2, < 6.4.7
Redhat1 product

6 vendors · 98 products

References

44 links
Show all 44 references