We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.

Please see our statement on Data Privacy.

Crisp.chat (Helpdesk and Chat)

Ok

THREATINT
PUBLISHED

CVE-2024-26998

serial: core: Clearing the circular buffer before NULLifying it



Description

In the Linux kernel, the following vulnerability has been resolved: serial: core: Clearing the circular buffer before NULLifying it The circular buffer is NULLified in uart_tty_port_shutdown() under the spin lock. However, the PM or other timer based callbacks may still trigger after this event without knowning that buffer pointer is not valid. Since the serial code is a bit inconsistent in checking the buffer state (some rely on the head-tail positions, some on the buffer pointer), it's better to have both aligned, i.e. buffer pointer to be NULL and head-tail possitions to be the same, meaning it's empty. This will prevent asynchronous calls to dereference NULL pointer as reported recently in 8250 case: BUG: kernel NULL pointer dereference, address: 00000cf5 Workqueue: pm pm_runtime_work EIP: serial8250_tx_chars (drivers/tty/serial/8250/8250_port.c:1809) ... ? serial8250_tx_chars (drivers/tty/serial/8250/8250_port.c:1809) __start_tx (drivers/tty/serial/8250/8250_port.c:1551) serial8250_start_tx (drivers/tty/serial/8250/8250_port.c:1654) serial_port_runtime_suspend (include/linux/serial_core.h:667 drivers/tty/serial/serial_port.c:63) __rpm_callback (drivers/base/power/runtime.c:393) ? serial_port_remove (drivers/tty/serial/serial_port.c:50) rpm_suspend (drivers/base/power/runtime.c:447) The proposed change will prevent ->start_tx() to be called during suspend on shut down port.

Reserved 2024-02-19 | Published 2024-05-01 | Updated 2024-12-19 | Assigner Linux

Product status

Default status
unaffected

434beb66368d4fb4d3119c2116b9398500adbf47 before 7ae7104d54342433a3a73975f6569beefdd86350
affected

43066e32227ecde674e8ae1fcdd4a1ede67680c2 before bb1118905e875c111d7ccef9aee86ac5e4e7f985
affected

43066e32227ecde674e8ae1fcdd4a1ede67680c2 before 9cf7ea2eeb745213dc2a04103e426b960e807940
affected

Default status
affected

6.8
affected

Any version before 6.8
unaffected

6.6.29
unaffected

6.8.8
unaffected

6.9
unaffected

References

git.kernel.org/...c/7ae7104d54342433a3a73975f6569beefdd86350

git.kernel.org/...c/bb1118905e875c111d7ccef9aee86ac5e4e7f985

git.kernel.org/...c/9cf7ea2eeb745213dc2a04103e426b960e807940

cve.org (CVE-2024-26998)

nvd.nist.gov (CVE-2024-26998)

Download JSON

Share this page
https://cve.threatint.eu/CVE/CVE-2024-26998

Support options

Helpdesk Chat, Email, Knowledgebase