CVE-2023-31248
CVSS v3
7.8
HIGH
EPSS Score
2.1 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
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
Technical details
- Published
- 2023-07-05
Frequently asked questions
What is CVE-2023-31248?
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
Is CVE-2023-31248 actively exploited?
Active exploitation of CVE-2023-31248 has not been confirmed. Its EPSS score was 2.1% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2023-31248?
CVE-2023-31248 has a CVSS v3 base score of 7.8 (HIGH severity).
Is CVE-2023-31248 affecting your environment?
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