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CVE-2026-31389: spi: fix use-after-free on controller registration failure

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-10-19
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: spi: fix use-after-free on controller registration failure Make sure to deregister from driver core also in the unlikely event that per-cpu statistics allocation fails during controller registration to avoid use-after-free (of driver resources) and unclocked register accesses.

Affected products

• Linux kernel: from 6.0 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.20; from 6.19 before 6.19.10; 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4 — fixed in 6.1.167, 6.12.78, 6.18.20, 6.19.10, 6.6.130

How to fix

Upgrade to a fixed version: Linux kernel 6.1.167, 6.12.78, 6.18.20, 6.19.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0e23f50086da7d0b183dfeac26021acfcdee086b
• https://git.kernel.org/stable/c/23b51bad2eb8787aa74324cfccefb258515ae5ba
• https://git.kernel.org/stable/c/6bbd385b30c7fb6c7ee0669e9ada91490938c051
• https://git.kernel.org/stable/c/80f3e8cd2b4ad355b2ad2024cf423f6d183404f7
• https://git.kernel.org/stable/c/8634e05b08ead636e926022f4a98416e13440df9
• https://git.kernel.org/stable/c/afe27c1f43aa57530011f419be6ddf71306565d2
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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