Use After Free in Linux Kernel
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
Vulnerability class: Use-After-Free
EPSS: 0.021 (79.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux Kernel — versions v5.9-rc1
- Linux Linux_kernel
- Canonical Ubuntu_linux — versions 14.04, 16.04, 18.04
- Debian Debian_linux — versions 11.0
- Fedoraproject Fedora — versions 37, 38
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@ubuntu.com (issue-tracking, Patch)
- security@ubuntu.com (mailing-list, Mailing List)
- security@ubuntu.com (Mailing List, Third Party Advisory)
- security@ubuntu.com (Third Party Advisory)
- security@ubuntu.com (Mailing List)
- security@ubuntu.com (Mailing List)
- security@ubuntu.com (VDB Entry, Third Party Advisory)
- security@ubuntu.com (VDB Entry, Third Party Advisory)
- security@ubuntu.com (VDB Entry, Third Party Advisory)
- security@ubuntu.com
Frequently asked questions
- What is CVE-2023-31248?
- CVE-2023-31248 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2023-07-05.
- How severe is CVE-2023-31248?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2023-31248 known to be exploited?
- 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.