What’s Vulnerable › Vulnerabilities

CVE-2026-80555: s390/vfio_ccw: Free all memory if cp_init() fails

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-08-27

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.

Affected products

• Linux kernel: 5.3 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/152fcb74a26804b70909381c6acc90595a0ae1c1
• https://git.kernel.org/stable/c/17e01e342af74de12899c206dcc9ec90684703aa
• https://git.kernel.org/stable/c/276bd7ed34d56c48c65c43c0b08f2ee77029b2fa
• https://git.kernel.org/stable/c/32e3d364a7b8295120d37e6a6bd433d2de26f748
• https://git.kernel.org/stable/c/4699b54fada156534cbb39834d47fc9374d7a1f5
• https://git.kernel.org/stable/c/6a917199aaf97904f5619afe3dfdacb155b03e8c
• https://git.kernel.org/stable/c/74186c2968f8f756ac3226b545b598457c910c75
• https://git.kernel.org/stable/c/f9bcff265556796834122f95de16d52a8375206c

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