Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: rpmsg: core: fix race in driver_override_show() and use core helper The driver_override_show function reads the driver_override string without holding the device_lock. However, the store function modifies and frees the string while holding the device_lock. This creates a race condition where the string can be freed by the store function while being read by the show function, leading to a use-after-free. To fix this, replace the rpmsg_string_attr macro with explicit show and store functions. The new driver_override_store uses the standard driver_set_override helper. Since the introduction of driver_set_override, the comments in include/linux/rpmsg.h have stated that this helper must be used to set or clear driver_override, but the implementation was not updated until now. Because driver_set_override modifies and frees the string while holding the device_lock, the new driver_override_show now correctly holds the device_lock during the read operation to prevent the race. Additionally, since rpmsg_string_attr has only ever been used for driver_override, removing the macro simplifies the code.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 39e47767ec9b22f844c2a07c9d329256960d4021 before 392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d; affected 39e47767ec9b22f844c2a07c9d329256960d4021 before d66b8074c555e8abb0ae19eea1c9f3635498bdde; affected 39e47767ec9b22f844c2a07c9d329256960d4021 before 47615557447185917afa432b7958f87583c417cb; affected 39e47767ec9b22f844c2a07c9d329256960d4021 before 90c8353f471821d7ccd4fe573a2402e056192494; affected 39e47767ec9b22f844c2a07c9d329256960d4021 before 7654e6e3cd6bdee9602f6063b3c670bd556d7e61; affected 39e47767ec9b22f844c2a07c9d329256960d4021 before 2e4a70f3c30910427e5ea848b799066d67b963d5; affected 39e47767ec9b22f844c2a07c9d329256960d4021 before 954557957177c3c13d7c655976665b1170da5e50; affected 39e47767ec9b22f844c2a07c9d329256960d4021 before 42023d4b6d2661a40ee2dcf7e1a3528a35c638ca |
| Linux / Linux | affected 4.18; unaffected 0 before 4.18; unaffected 5.10.252 through 5.10.*; unaffected 5.15.202 through 5.15.*; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.16 through 6.18.*; unaffected 6.19.6 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d
- https://git.kernel.org/stable/c/d66b8074c555e8abb0ae19eea1c9f3635498bdde
- https://git.kernel.org/stable/c/47615557447185917afa432b7958f87583c417cb
- https://git.kernel.org/stable/c/90c8353f471821d7ccd4fe573a2402e056192494
- https://git.kernel.org/stable/c/7654e6e3cd6bdee9602f6063b3c670bd556d7e61
- https://git.kernel.org/stable/c/2e4a70f3c30910427e5ea848b799066d67b963d5
- https://git.kernel.org/stable/c/954557957177c3c13d7c655976665b1170da5e50
- https://git.kernel.org/stable/c/42023d4b6d2661a40ee2dcf7e1a3528a35c638ca
ADP enrichment
No English description supplied.
No references supplied.