CVE-2026-98793
Received
Received - Intake
BPF NAT Manipulation Type Validation Flaw in Linux Kernel
Vulnerability report for CVE-2026-98793, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-18
Last updated on: 2026-10-18
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: bpf: reject invalid NAT manipulation types
As bpf_ct_set_nat_info() is not validating the NAT manipulation type a
wrong value can be passed directly to nf_nat_setup_info(). This triggers
the WARN_ON() at nf_nat_setup_info() and if panic_on_warn isn't set,
then IPS_SRC_NAT_DONE is set without adding nat_bysource and conntrack
cleanup tries to unlink an uninitialized hlist node.
Fix this by checking that NAT manipulation type is correct before
calling nf_nat_setup_info(). In addition, if the WARN_ON is hit, return
NF_DROP instead of continuing with the processing to avoid similar
situations in the future.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 |
| Linux | Linux | 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 |
| Linux | Linux | 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 |
| Linux | Linux | 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 |
| Linux | Linux | 6.1 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
