CVE-2026-90141

Description

In the Linux kernel, the following vulnerability has been resolved: ipvs: fix integer overflow in ftp helper port/address parsing ip_vs_ftp_get_addrport() accumulates decimal digits into a __u16 (hport) and into unsigned char (p[]) without checking for overflow. A crafted FTP PASV/EPSV response with an over-long port or address octet wraps the value, so the helper configures the data connection with a truncated port/address. The netfilter conntrack FTP helper had the same defect, fixed in commit 2b413fc689ba ("netfilter: nf_conntrack_ftp: avoid u16 overflows"). Apply the equivalent fix here: widen the port accumulator to u32 and reject values above 65535, and reject address octets above 255.

References

• https://git.kernel.org/stable/c/00bcc6d679262ea42688fba1d7819ea6e56f12ef
• https://git.kernel.org/stable/c/4aed450adaee3a021db27be94c61fe025b0d05ff
• https://git.kernel.org/stable/c/50cb9b7263a2ed01f7d2f97818a800c2ee05f661
• https://git.kernel.org/stable/c/b1908bff0faaa94d55be72da65879cad632e8236
• https://git.kernel.org/stable/c/d02de9a7a7e2484da0cf37e50614840623b98a62