Strix
75.2K

CVE-2026-90336

UnknownEPSS 0.21%

Last modified

CVE-2026-90336 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: serial: core: clear freed pointers on uart_register_driver() failure uart_register_driver() leaves drv->state pointing to freed memory when tty_alloc_driver() fails. If tty_register_driver() fails, drv->tty_driver also retains a pointer after its reference is dropped. Drivers that use drv->state as an "already registered" flag can then skip registration on the next probe and pass the freed state to uart_add_one_port(). This issue was found with failslab on QEMU's raspi1ap board by failing registration and binding the PL011 port again. Clear both pointers on their failure paths, as uart_unregister_driver() already does.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: serial: core: clear freed pointers on uart_register_driver() failure uart_register_driver() leaves drv->state pointing to freed memory when tty_alloc_driver() fails. If tty_register_driver() fails, drv->tty_driver also retains a pointer after its reference is dropped. Drivers that use drv->state as an "already registered" flag can then skip registration on the next probe and pass the freed state to uart_add_one_port(). This issue was found with failslab on QEMU's raspi1ap board by failing registration and binding the PL011 port again. Clear both pointers on their failure paths, as uart_unregister_driver() already does.

Metrics

EPSS Probability
0.21%

11.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 5e260edd28eddc3b92c9f578df3026fd11c710cf; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a9c0ffe5930c97b352f32febfc59a6e6ae6772ee; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 802e2192a9d38027730c2869c67c9131b8c8fe9f; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ddf51d74ee9f9857c99477329d80408cedebda61; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 06b376432974fe5f25f2843a8e8438c6a1cf3d50; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 61a2fb25551be0375bc16ef2a70c987dfca26183
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90336?
In the Linux kernel, the following vulnerability has been resolved: serial: core: clear freed pointers on uart_register_driver() failure uart_register_driver() leaves drv->state pointing to freed memory when tty_alloc_driver() fails. If tty_register_driver() fails, drv->tty_driver also retains a pointer after its reference is dropped. Drivers that use drv->state as an "already registered" flag can then skip registration on the next probe and pass the freed state to uart_add_one_port(). This issue was found with failslab on QEMU's raspi1ap board by failing registration and binding the PL011 port again. Clear both pointers on their failure paths, as uart_unregister_driver() already does.
How severe is CVE-2026-90336?
Severity scoring for CVE-2026-90336 is pending analysis. The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-90336?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-90336?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST