CVE-2022-34918 — An issue was discovered in the Linux kernel through 5

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

01What is this vulnerability?

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…

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2022-07-04T21:15:07.730
• Last modified: 2026-10-14T17:17:40.583

09References

• packetstormsecurity.com — http://packetstormsecurity.com/files/168191/Kernel-Live-Patch-Security-Notice-LS…
• packetstormsecurity.com — http://packetstormsecurity.com/files/168543/Netfilter-nft_set_elem_init-Heap-Ove…
• www.openwall.com — http://www.openwall.com/lists/oss-security/2022/07/05/1
• www.openwall.com — http://www.openwall.com/lists/oss-security/2022/08/06/5
• git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=7e6bc1…
• lore.kernel.org — https://lore.kernel.org/netfilter-devel/cd9428b6-7ffb-dd22-d949-d86f4869f452%40r…
• security.netapp.com — https://security.netapp.com/advisory/ntap-20220826-0004/
• www.debian.org — https://www.debian.org/security/2022/dsa-5191
• www.openwall.com — https://www.openwall.com/lists/oss-security/2022/07/02/3
• www.randorisec.fr — https://www.randorisec.fr/crack-linux-firewall/