CVE-2024-40903

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

usb: typec: tcpm: fix use-after-free case in tcpm_register_source_caps

There could be a potential use-after-free case in tcpm_register_source_caps(). This could happen when:

• new (say invalid) source caps are advertised
• the existing source caps are unregistered
• tcpm_register_source_caps() returns with an error as usb_power_delivery_register_capabilities() fails

This causes port->partner_source_caps to hold on to the now freed source caps.

Reset port->partner_source_caps value to NULL after unregistering existing source caps.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/04c05d50fa79a41582f7bde8a1fd4377ae4a39e5
• https://git.kernel.org/stable/c/4053696594d7235f3638d49a00cf0f289e4b36a3
• https://git.kernel.org/stable/c/6b67b652849faf108a09647c7fde9b179ef24e2b
• https://git.kernel.org/stable/c/e7e921918d905544500ca7a95889f898121ba886
• https://git.kernel.org/stable/c/04c05d50fa79a41582f7bde8a1fd4377ae4a39e5
• https://git.kernel.org/stable/c/4053696594d7235f3638d49a00cf0f289e4b36a3
• https://git.kernel.org/stable/c/6b67b652849faf108a09647c7fde9b179ef24e2b
• https://git.kernel.org/stable/c/e7e921918d905544500ca7a95889f898121ba886