CVE-2022-36946
Published: 27 July 2022
Summary
CVE-2022-36946 is a high-severity an unspecified weakness vulnerability in Linux Linux Kernel. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 10.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
The vulnerability is a denial-of-service flaw in the nfqnl_mangle function within net/netfilter/nfnetlink_queue.c of the Linux kernel through version 5.18.14. When an nf_queue verdict supplies a one-byte nfta_payload attribute, an skb_pull operation can produce a negative skb->len value, triggering a kernel panic. The issue carries a CVSS 3.1 score of 7.5 and affects the netfilter subsystem used for packet queuing and mangling.
Remote attackers with network access can send specially crafted packets that reach the netfilter queue, causing the kernel to panic and resulting in a complete loss of availability on the affected system. No authentication or user interaction is required, and the attack can be mounted over the network without any special privileges.
Kernel developers addressed the flaw in commit 99a63d36cb3ed5ca3aa6fcb64cffbeaf3b0fb164. Debian issued LTS updates in September and October 2022, while NetApp published advisory ntap-20220901-0007 recommending that customers apply the corresponding kernel patches or upgrade to a fixed release.
The EPSS score has remained flat at 0.0508 with no material increase after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-39603
Vulnerability details
nfqnl_mangle in net/netfilter/nfnetlink_queue.c in the Linux kernel through 5.18.14 allows remote attackers to cause a denial of service (panic) because, in the case of an nf_queue verdict with a one-byte nfta_payload attribute, an skb_pull can encounter a negative skb->len.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.