CVE-2022-34918 — An issue was discovered in the Linux kernel through 5.18.9. A type confusion bug in...
An issue was discovered in the Linux kernel through 5.18.9. A type confusion bug in nft_set_elem_init (leading to a buffer overflow) could be used by a local attacker to escalate privileges, a different vulnerability than CVE-2022-32250. (The attacker can obtain root access, but must start with an unprivileged user namespace to obtain CAP_NET_ADMIN access.) This can be fixed in nft_setelem_parse_data in net/netfilter/nf_tables_api.c.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Public exploit/PoC (metasploit)+12
- EPSS 5.5% (30-day exploitation probability)+14
- Technical severity (high)+6
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — git.kernel.org (NIST National Vulnerability Database)
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Canonical Ubuntu Linux, Debian Debian Linux, Linux Linux Kernel…).
- Apply the fixed version or the patch documented under Remediation.
- EPSS ahead of 93% of scored CVEs: prioritize it in the patch queue.
- Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Canonical | Ubuntu Linux | version 14.04version 16.04version 18.04version 20.04version 22.04 | Vulnerable | NIST National Vulnerability Database |
| Debian | Debian Linux | version 11.0 | Vulnerable | NIST National Vulnerability Database |
| Linux | Linux Kernel | ≥ 4.20 and < 5.4.244≥ 5.16 and < 5.18.11≥ 5.11 and < 5.15.54≥ 5.5 and < 5.10.130≥ 4.15 and < 4.19.284≥ 4.1 and < 4.14.316 | Vulnerable | NIST National Vulnerability Database |
| Netapp | H300s Firmware | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Netapp | H410c Firmware | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Netapp | H410s Firmware | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Netapp | H500s Firmware | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Netapp | H700s Firmware | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 7.8 | CVSS 3.1 | High | 1.8 | 5.9 | nvd@nist.gov via NIST National Vulnerability Database |
| 7.8 | CVSS 3.1 | High | — | — | GitHub, Inc. via GitHub Security Advisories |
| 7.2 | CVSS 2.0 | High | 3.9 | 10.0 | nvd@nist.gov via NIST National Vulnerability Database |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
Public exploits, PoCs and detection templates
Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.
- Netfilter nft_set_elem_init Heap Overflow Privilege Escalation average Feb 7, 2022
Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
- Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
Timeline
What happened to this CVE, newest first.
- 2026
- Record published
- Fix documented
- Affected products added · linux/linux kernel, debian/debian linux, canonical/ubuntu linux, netapp/h300s firmware, netapp/h500s firmware, netapp/h7
- CVSS changed · 7.8
- Source status changed · → Modified
- Record created in this database
- 2022
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 2× References added · Oct 14, 2026 – Oct 14, 2026
- 1× Official description updated · Oct 14, 2026 – Oct 14, 2026
References
15 on the record
- git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/
- packetstormsecurity.com/files/168191/Kernel-Live-Patch-Security-Notice-LSN-0089-1.html
- cert-portal.siemens.com/productcert/html/ssa-806742.html
- security.netapp.com/advisory/ntap-20220826-0004/
- www.randorisec.fr/crack-linux-firewall/
- www.openwall.com/lists/oss-security/2022/07/05/1
- www.openwall.com/lists/oss-security/2022/07/02/3
- packetstormsecurity.com/files/168543/Netfilter-nft_set_elem_init-Heap-Overflow-Privilege-Esca
- github.com/advisories/GHSA-9v26-h3ph-p8v7
- nvd.nist.gov/vuln/detail/CVE-2022-34918
- www.openwall.com/lists/oss-security/2022/08/06/5
- cert-portal.siemens.com/productcert/html/ssa-794697.html
- lore.kernel.org/netfilter-devel/cd9428b6-7ffb-dd22-d949-d86f4869f452@randorisec.fr/T/
- www.debian.org/security/2022/dsa-5191
- lore.kernel.org/netfilter-devel/cd9428b6-7ffb-dd22-d949-d86f4869f452%40randorisec.fr/
Elsewhere on this site
Related CVEs (same products)
- Medium CVE-2026-98164 KVM: x86/mmu: Check write tracking in all address spaces 16d
- High CVE-2026-98163 cgroup: Avoid iteration of dying tasks with zero refcount 19d
- Medium CVE-2026-98162 smb/server: fix tree connection leak in smb2_tree_connect() 20d
- Medium CVE-2026-98160 In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs… 20d
- Medium CVE-2026-98161 Improper Check for Unusual or Exceptional Conditions in Linux Linux Kernel 20d
- Medium CVE-2026-100079 Missing Release of Resource after Effective Lifetime in Linux Linux Kernel 20d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No CISA SSVC assessment.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2022-34918 is "An issue was discovered in the Linux kernel through 5.18.9. A type confusion bug in...", rated High. It affects Ubuntu Linux (Canonical); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.8 describes technical severity. EPSS 5.45% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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