CVE-2023-53669

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains a flaw in the skb copy ubufs() function related to TCP handling and large TCP segments (BIG TCP). A crash can occur when using TCP zerocopy with hugepages and skb lengths exceeding approximately 68 KB. The issue arises because skb copy ubufs() incorrectly assumes the ability to copy all payload data using a limited number of order-0 pages, which fails when BIG TCP allows up to 512 KB per skb. The problem was not observed in some environments due to configuration limits on the maximum segment size and the number of SKB fragments. The fix involves using higher-order pages when necessary.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.