CVE-2026-90334

Summary

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

tty: clear cdev pointer after cdev_add() failure

tty_cdev_add() drops the cdev reference when cdev_add() fails, but leaves driver->cdevs[index] pointing to freed memory. tty_unregister_device() later passes that stale pointer to cdev_del(), causing a use-after-free.

Clear the slot after dropping the reference.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc1a752ba2d6b8a52879c7ab637cff38359ea9827 < fb1de260033c215dba438973d82b48562bdc86bbaffected
LinuxLinuxc1a752ba2d6b8a52879c7ab637cff38359ea9827 < e9e64dd02fd68776afda00777591eca0c3984285affected
LinuxLinuxc1a752ba2d6b8a52879c7ab637cff38359ea9827 < 33a44333a9dfda044b0e233399b12ead7f8a90aeaffected
LinuxLinuxc1a752ba2d6b8a52879c7ab637cff38359ea9827 < d331c63570af61ef7aaf516b64a8d6f47518a3a4affected
LinuxLinuxc1a752ba2d6b8a52879c7ab637cff38359ea9827 < a83fcddf3c75d004f12aa13555bb73da19fb75a9affected
LinuxLinuxc1a752ba2d6b8a52879c7ab637cff38359ea9827 < 4f6bd79bb7e55095f09bec9b4eb6c09df1306116affected
LinuxLinuxc1a752ba2d6b8a52879c7ab637cff38359ea9827 < 5c5a795bf6248fe96f96dd9fd79d66bbb4a92077affected
LinuxLinuxc1a752ba2d6b8a52879c7ab637cff38359ea9827 < 6645856f0df3aeecd45519cb611415b4b89c2223affected
LinuxLinux4.3affected
LinuxLinux0 < 4.3unaffected
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
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References