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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.019 (79.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.019 · change: -0.002
Affected products
- Linux Kernel — versions v5.9-rc1
- Linux Kernel
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
- Debian Linux — versions 11.0
- Fedoraproject Fedora — versions 37, 38
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lore.kernel.org/netfilter-devel/20230705121627.GC19489@breakpoint.cc/T/ (issue-tracking, Patch)
- www.openwall.com/lists/oss-security/2023/07/05/2 (mailing-list, Mailing List)
- www.openwall.com/lists/oss-security/2023/07/05/2 (Mailing List, Third Party Advisory)
- www.debian.org/security/2023/dsa-5453 (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
- packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096… (VDB Entry, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/08/msg00001.html (VDB Entry, Third Party Advisory)
- packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097… (VDB Entry, Third Party Advisory)
- security.netapp.com/advisory/ntap-20240201-0001/
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.