CVE-2026-80555

Summary

In the Linux kernel, the following vulnerability has been resolved:

s390/vfio_ccw: Free all memory if cp_init() fails

The routine cp_free() is called to unpin/free any memory once an I/O is completed successfully, or if cp_prefetch() fails. But if cp_init() fails, and cp->initialized is not enabled, the same routine cannot be used to free all the memory.

An attempt to address this exists in ccwchain_handle_ccw(), where a single call to ccwchain_free() is made for the currently-processed CCW segment. But this will leak other segments (created as a result of a Transfer in Channel) that had been allocated as part of the same channel program.

Address this by performing the cleanup outside of the recursive ccwchain_handle_ccw()/ccwchain_loop_tic() logic.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8b515be512a2435bb8aedc6390cbe140167f9eb9 < 276bd7ed34d56c48c65c43c0b08f2ee77029b2faaffected
LinuxLinux8b515be512a2435bb8aedc6390cbe140167f9eb9 < f9bcff265556796834122f95de16d52a8375206caffected
LinuxLinux8b515be512a2435bb8aedc6390cbe140167f9eb9 < 17e01e342af74de12899c206dcc9ec90684703aaaffected
LinuxLinux8b515be512a2435bb8aedc6390cbe140167f9eb9 < 152fcb74a26804b70909381c6acc90595a0ae1c1affected
LinuxLinux8b515be512a2435bb8aedc6390cbe140167f9eb9 < 6a917199aaf97904f5619afe3dfdacb155b03e8caffected
LinuxLinux8b515be512a2435bb8aedc6390cbe140167f9eb9 < 32e3d364a7b8295120d37e6a6bd433d2de26f748affected
LinuxLinux8b515be512a2435bb8aedc6390cbe140167f9eb9 < 4699b54fada156534cbb39834d47fc9374d7a1f5affected
LinuxLinux8b515be512a2435bb8aedc6390cbe140167f9eb9 < 74186c2968f8f756ac3226b545b598457c910c75affected
LinuxLinux5.3affected
LinuxLinux0 < 5.3unaffected
LinuxLinux5.10.267 <= 5.10.*unaffected
LinuxLinux5.15.218 <= 5.15.*unaffected
LinuxLinux6.1.185 <= 6.1.*unaffected
LinuxLinux6.6.154 <= 6.6.*unaffected
LinuxLinux6.12.105 <= 6.12.*unaffected
LinuxLinux6.18.46 <= 6.18.*unaffected
LinuxLinux7.1.10 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References