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

Weaknesses

References

• https://git.kernel.org/stable/c/6a917199aaf97904f5619afe3dfdacb155b03e8c
• https://git.kernel.org/stable/c/32e3d364a7b8295120d37e6a6bd433d2de26f748
• https://git.kernel.org/stable/c/4699b54fada156534cbb39834d47fc9374d7a1f5
• https://git.kernel.org/stable/c/74186c2968f8f756ac3226b545b598457c910c75

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