What’s Vulnerable › Vulnerabilities

CVE-2022-49711: bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove() In fsl_mc_bus_remove(), mc->root_mc_bus_dev->mc_io is passed to fsl_destroy_mc_io(). However, mc->root_mc_bus_dev is already freed in fsl_mc_device_remove(). Then reference to mc->root_mc_bus_dev->mc_io triggers KASAN use-after-free. To avoid the use-after-free, keep the reference to mc->root_mc_bus_dev->mc_io in a local variable and pass to fsl_destroy_mc_io(). This patch needs rework to apply to kernels older than v5.15.

Affected products

• Linux kernel: from 4.8 before 5.10.248; from 5.11 before 5.15.49; from 5.16 before 5.18.6; 5.19-rc1, 5.19-rc2 — fixed in 5.10.248, 5.15.49, 5.18.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.248, 5.15.49, 5.18.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/161b68b0a728377aaa10a8e14c70e7734f3c9ff7
• https://git.kernel.org/stable/c/720ab105df7bf3eee62d2bddd41526b29d07d045
• https://git.kernel.org/stable/c/928ea98252ad75118950941683893cf904541da9
• https://git.kernel.org/stable/c/ccd1751092341ac120a961835211f9f2e3735963

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