In FreeBSD 12.1-STABLE before r364644, 11.4-STABLE before r364651, 12.1-RELEASE before p9, 11.4-RELEASE before p3, and 11.3-RELEASE before p13, improper handling in the kernel causes a use-after-free bug by sending large user messages from multiple threads on the same SCTP socket. The use-after-free situation may result in unintended kernel behaviour including a kernel panic.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://security.FreeBSD.org/advisories/FreeBSD-SA-20:25.sctp.asc | vendor advisory |
| https://support.apple.com/kb/HT212317 | third party advisory |
| https://support.apple.com/kb/HT212319 | third party advisory |
| https://support.apple.com/kb/HT212325 | third party advisory |
| https://support.apple.com/kb/HT212323 | third party advisory |
| https://support.apple.com/kb/HT212324 | third party advisory |
| https://support.apple.com/kb/HT212321 | third party advisory |
| https://support.apple.com/kb/HT212318 | third party advisory |
| http://seclists.org/fulldisclosure/2021/Apr/49 | third party advisory mailing list |
| http://seclists.org/fulldisclosure/2021/Apr/50 | third party advisory mailing list |
| http://seclists.org/fulldisclosure/2021/Apr/59 | third party advisory mailing list |
| http://seclists.org/fulldisclosure/2021/Apr/58 | third party advisory mailing list |
| http://seclists.org/fulldisclosure/2021/Apr/57 | third party advisory mailing list |