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CVE-2026-80548

s390/vfio_ccw: Selectively expand io_mutex

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.218, 6.1.185, 6.6.153, 6.12.105, 6.18.46, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Selectively expand io_mutex The io_mutex was defined to serialize the io_regions, but then has also sort of been associated with the I/O themselves because of the close relationship they share. With the handful of races that are possible, the choices are either to: A) expand the scope of io_mutex to close these remaining windows, or B) reduce the scope of io_mutex to just io_region, and introduce a new lock mechanism for the remaining I/O resources This patch implements A, since B brings with it a lot more interactions that would need to be tracked and kept in a correct hierarchy. It also takes advantage of the workqueue element for cp_free() that now gets called out of fsm_notoper(), which could be invoked out of an interrupt context and thus cannot acquire a mutex itself.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 4f76617378ee97c557b526cb58d3c61eb0a9c963 · fixed in dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0; From 4f76617378ee97c557b526cb58d3c61eb0a9c963 · fixed in 56d7488533ceac4e986e96e15c9e487a2245bc01; From 4f76617378ee97c557b526cb58d3c61eb0a9c963 · fixed in f72a51810d49411bd8cad0c2df8592320a2fe5cc; From 4f76617378ee97c557b526cb58d3c61eb0a9c963 · fixed in 2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd; From 4f76617378ee97c557b526cb58d3c61eb0a9c963 · fixed in b6aecea4b2b246f9fbd98a5712daa1193a60818e; From 4f76617378ee97c557b526cb58d3c61eb0a9c963 · fixed in 2a5ac0c0f1f7da33929211a2e41911bf72ee35d8; From 4f76617378ee97c557b526cb58d3c61eb0a9c963 · fixed in 34f4feff3e90bd09308fad0974e97113b23b812a

  • Linux Linux

    5.2

  • KernelLinux

    From 5.2.0 · fixed in 5.15.218; From 5.16.0 · fixed in 6.1.185; From 6.2.0 · fixed in 6.6.153; From 6.7.0 · fixed in 6.12.105; From 6.13.0 · fixed in 6.18.46; From 6.19.0 · fixed in 7.1.10

References 7

git.kernel.org