CVE-2026-89823

Summary

In the Linux kernel, the following vulnerability has been resolved:

drm: fix race between partial drm_dev_register() failure and ioctl

If drm_dev_register() fails after registering a minor (e.g. render minor registered, primary minor fails), userspace could have opened the first minor and entered a drm_dev_enter() critical section. Since the unplugged flag was never set, the ioctl proceeds while the error path tears down device resources.

Fix this by introducing drm_dev_synchronize_unplug(), which sets the unplugged flag and waits for the SRCU barrier, ensuring all in-flight drm_dev_enter() critical sections complete before cleanup proceeds; call it on the error path of drm_dev_register().

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbee330f3d67273a68dcb99f59480d59553c008b2 < 26d9162213952927cd59c0d94b7e0e992b347becaffected
LinuxLinuxbee330f3d67273a68dcb99f59480d59553c008b2 < 24d28d15c0f7f7d4a1c229f8730314f0f8758810affected
LinuxLinuxbee330f3d67273a68dcb99f59480d59553c008b2 < 6729990df9e70623bf53f855b521ae71ca9cb278affected
LinuxLinuxbee330f3d67273a68dcb99f59480d59553c008b2 < a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22caffected
LinuxLinuxbee330f3d67273a68dcb99f59480d59553c008b2 < 19dbfe4d586aecfed121cb3fa62281761d9d341faffected
LinuxLinuxbee330f3d67273a68dcb99f59480d59553c008b2 < 79d09cfe90304ff4f195e47d569800f5e0f8b854affected
LinuxLinuxbee330f3d67273a68dcb99f59480d59553c008b2 < 2d1215a72159d00001e08dee162e27718934bee9affected
LinuxLinuxbee330f3d67273a68dcb99f59480d59553c008b2 < eb197f7d60f00d0f5b1b3505dfc86a7e36045a3eaffected
LinuxLinux4.18affected
LinuxLinux0 < 4.18unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References