CVE-2022-49013

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

sctp: fix memory leak in sctp_stream_outq_migrate()

When sctp_stream_outq_migrate() is called to release stream out resources, the memory pointed to by prio_head in stream out is not released.

The memory leak information is as follows: unreferenced object 0xffff88801fe79f80 (size 64): comm sctp_repo, pid 7957, jiffies 4294951704 (age 36.480s) hex dump (first 32 bytes): 80 9f e7 1f 80 88 ff ff 80 9f e7 1f 80 88 ff ff ……………. 90 9f e7 1f 80 88 ff ff 90 9f e7 1f 80 88 ff ff ……………. backtrace: [] kmalloc_trace+0x26/0x60 [] sctp_sched_prio_set+0x4cc/0x770 [] sctp_stream_init_ext+0xd2/0x1b0 [] sctp_sendmsg_to_asoc+0x1614/0x1a30 [] sctp_sendmsg+0xda1/0x1ef0 [] inet_sendmsg+0x9d/0xe0 [] sock_sendmsg+0xd3/0x120 [] __sys_sendto+0x23a/0x340 [] __x64_sys_sendto+0xe1/0x1b0 [] do_syscall_64+0x39/0xb0 [] entry_SYSCALL_64_after_hwframe+0x63/0xcd

Weakness

The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.

Affected Software

Potential Mitigations

• Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
• For example, glibc in Linux provides protection against free of invalid pointers.
• When using Xcode to target OS X or iOS, enable automatic reference counting (ARC) [REF-391].
• To help correctly and consistently manage memory when programming in C++, consider using a smart pointer class such as std::auto_ptr (defined by ISO/IEC ISO/IEC 14882:2003), std::shared_ptr and std::unique_ptr (specified by an upcoming revision of the C++ standard, informally referred to as C++ 1x), or equivalent solutions such as Boost.

References

• https://git.kernel.org/stable/c/0dfb9a566327182387c90100ea54d8426cee8c67
• https://git.kernel.org/stable/c/176ee6c673ccd118e9392fd2dbb165423bdb99ca
• https://git.kernel.org/stable/c/9ed7bfc79542119ac0a9e1ce8a2a5285e43433e9
• https://git.kernel.org/stable/c/a7555681e50bdebed2c40ff7404ee73c2e932993
• https://git.kernel.org/stable/c/fa20f88271259d42ebe66f0a8c4c20199e888c99