VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 7.8 highEPSS 1.9% probability of exploitation in 30 days
Linux

CVE-2023-31248: Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 1 public report, the first from .

How likely is exploitation in the next 30 days?
1.9%

EPSS score, percentile 79.5 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
7.8 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

  • v5.9-rc1

Versions by product

Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability

Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability; `nft_chain_lookup_byid()` failed to check whether a chain was active and CAP_NET_ADMIN is in any user or network namespace

Source: CVE List, as of . About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (1 product)
Linux Linux Kernel
StatusVersions
Affectedv5.9-rc1

Source: CVE List, as of . About the data.

Weakness

CWE-416

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

References

10

Known exploited Linux vulnerabilities

  • CVE-2026-46300: Linux Kernel Missing Initialization of a Variable Vulnerability (added )
  • CVE-2025-39682: Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability (added )
  • CVE-2025-39964: Linux Kernel Race Condition Vulnerability (added )
  • CVE-2026-53266: Linux Kernel Out-of-Bounds Write Vulnerability (added )
  • CVE-2026-53362: Linux Kernel Unspecified Vulnerability (added )