Advisory [CVE-2026-64420] Delay dev_set_drvdata until probe success
This security Red Hat Linux advisory covers CVE-2026-64420.
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Summary
In the Linux kernel, the following vulnerability has been resolved: mfd: cros_ec: Delay dev_set_drvdata() until probe success If ec_device_probe() fails, cros_ec_class_release releases memory for the cros_ec_dev structure.
However, because the drvdata was already set, sub-drivers like cros_ec_typec can still retrieve the stale pointer via the platform device. This leads to a use-after-free when cros_ec_typec attempts to access &typec->ec->ec->dev on a device that has already been released.
Move dev_set_drvdata() to ensure that the pointer is only made available once all initialization steps have succeeded. sysfs: cannot create duplicate filename '/class/chromeos/cros_ec' Call trace: sysfs_do_create_link_sd+0x94/0xdc sysfs_create_link+0x30/0x44 device_add_class_symlinks+0x90/0x13c device_add+0xf0/0x50c ec_device_probe+0x150/0x4f0 platform_probe+0xa0/0xe0...
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 1 month ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 month ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 month ago·verify at source
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