A NULL pointer dereference flaw was found in the Linux kernel’s X.25 set of standardized network protocols functionality in the way a user terminates their session using a simulated Ethernet card and continued usage of this connection. This flaw allows a local user to crash the system.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
The product dereferences a pointer that it expects to be valid but is NULL.
| Link | Tags |
|---|---|
| https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=7781607938c8 | patch vendor advisory mailing list |
| http://www.openwall.com/lists/oss-security/2022/06/19/1 | mailing list |
| https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html | third party advisory mailing list |
| https://www.debian.org/security/2022/dsa-5173 | third party advisory vendor advisory |