Linux Kernel: NULLDeref via uninitialized perCPU spi statistics
CVE-2026-23475 Published on April 3, 2026
spi: fix statistics allocation
In the Linux kernel, the following vulnerability has been resolved:
spi: fix statistics allocation
The controller per-cpu statistics is not allocated until after the
controller has been registered with driver core, which leaves a window
where accessing the sysfs attributes can trigger a NULL-pointer
dereference.
Fix this by moving the statistics allocation to controller allocation
while tying its lifetime to that of the controller (rather than using
implicit devres).
Products Associated with CVE-2026-23475
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Affected Versions
Linux:- Version 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 and below 80c5bd0dca1cc5526ae0f4b273ccd163ed4caa4e is affected.
- Version 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 and below f13100b1f5f111989f0750540a795fdef47492af is affected.
- Version 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 and below df30056c78e8bead02d4be020199cabdbec0fef1 is affected.
- Version 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 and below 378b295f67102eef78cf2c28105f60ae1dab5cc1 is affected.
- Version 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 and below 118ce777d39f03cac99231196f820e4f998613a8 is affected.
- Version 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 and below dee0774bbb2abb172e9069ce5ffef579b12b3ae9 is affected.
- Version 6.0 is affected.
- Before 6.0 is unaffected.
- Version 6.1.167, <= 6.1.* is unaffected.
- Version 6.6.130, <= 6.6.* is unaffected.
- Version 6.12.78, <= 6.12.* is unaffected.
- Version 6.18.20, <= 6.18.* is unaffected.
- Version 6.19.10, <= 6.19.* is unaffected.
- Version 7.0-rc5, <= * is unaffected.