CVE-2024-50251: netfilter: nft_payload: sanitize offset and length before calling skb_checksum()

Severity: medium (CVSS 6.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-09 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_payload: sanitize offset and length before calling skb_checksum() If access to offset + length is larger than the skbuff length, then skb_checksum() triggers BUG_ON(). skb_checksum() internally subtracts the length parameter while iterating over skbuff, BUG_ON(len) at the end of it checks that the expected length to be included in the checksum calculation is fully consumed.

Affected products

Linux kernel: from 4.5 before 4.19.323; from 4.20 before 5.4.285; from 5.5 before 5.10.229; from 5.11 before 5.15.171; from 5.16 before 6.1.116; from 6.2 before 6.6.60 — fixed in 4.19.323, 5.10.229, 5.15.171, 5.4.285, 6.1.116, 6.11.7

How to fix

Upgrade to a fixed version: Linux kernel 4.19.323, 5.10.229, 5.15.171, 5.4.285. Check the vendor advisory for mitigations.

References

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