CVE-2026-80555
Description
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.
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Affected products
2Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/152fcb74a26804b70909381c6acc90595a0ae1c1nvd
- git.kernel.org/stable/c/17e01e342af74de12899c206dcc9ec90684703aanvd
- git.kernel.org/stable/c/276bd7ed34d56c48c65c43c0b08f2ee77029b2fanvd
- git.kernel.org/stable/c/32e3d364a7b8295120d37e6a6bd433d2de26f748nvd
- git.kernel.org/stable/c/4699b54fada156534cbb39834d47fc9374d7a1f5nvd
- git.kernel.org/stable/c/6a917199aaf97904f5619afe3dfdacb155b03e8cnvd
- git.kernel.org/stable/c/74186c2968f8f756ac3226b545b598457c910c75nvd
- git.kernel.org/stable/c/f9bcff265556796834122f95de16d52a8375206cnvd
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