In the Linux kernel, the following vulnerability has been resolved:
tty: xilinx_uartps: split sysrq handling
lockdep detects the following circular locking dependency:
CPU 0 CPU 1
========================== ============================
cdns_uart_isr() printk()
uart_port_lock(port) console_lock()
cdns_uart_console_write()
if (!port->sysrq)
uart_port_lock(port)
uart_handle_break()
port->sysrq = ...
uart_handle_sysrq_char()
printk()
console_lock()
The fixed commit attempts to avoid this situation by only taking the
port lock in cdns_uart_console_write if port->sysrq unset. However, if
(as shown above) cdns_uart_console_write runs before port->sysrq is set,
then it will try to take the port lock anyway. This may result in a
deadlock.
Fix this by splitting sysrq handling into two parts. We use the prepare
helper under the port lock and defer handling until we release the lock.
References
Configurations
Configuration 1 (hide)
|
History
13 Mar 2025, 13:15
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
05 Mar 2025, 14:05
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux linux Kernel
Linux |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| References | () https://git.kernel.org/stable/c/9b88a7c4584ba67267a051069b8abe44fc9595b2 - Patch | |
| References | () https://git.kernel.org/stable/c/4410dba9807a17a93f649a9f5870ceaf30a675a3 - Patch | |
| References | () https://git.kernel.org/stable/c/b06f388994500297bb91be60ffaf6825ecfd2afe - Patch | |
| References | () https://git.kernel.org/stable/c/de5bd24197bd9ee37ec1e379a3d882bbd15c5065 - Patch | |
| References | () https://git.kernel.org/stable/c/8ea0e7b3d7b8f2f0fc9db491ff22a0abe120801c - Patch |
27 Feb 2025, 20:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-02-27 20:16
Updated : 2025-03-13 13:15
NVD link : CVE-2025-21820
Mitre link : CVE-2025-21820
JSON object : View
Products Affected
linux
- linux_kernel
CWE
No CWE.