CVE-2024-27393

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

xen-netfront: Add missing skb_mark_for_recycle

Notice that skb_mark_for_recycle() is introduced later than fixes tag in commit 6a5bcd84e886 (page_pool: Allow drivers to hint on SKB recycling).

It is believed that fixes tag were missing a call to page_pool_release_page() between v5.9 to v5.14, after which is should have used skb_mark_for_recycle(). Since v6.6 the call page_pool_release_page() were removed (in commit 535b9c61bdef (net: page_pool: hide page_pool_release_page()) and remaining callers converted (in commit 6bfef2ec0172 (Merge branch net-page_pool-remove-page_pool_release_page)).

This leak became visible in v6.8 via commit dba1b8a7ab68 (mm/page_pool: catch page_pool memory leaks).

Weakness

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

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/037965402a010898d34f4e35327d22c0a95cd51f
• https://git.kernel.org/stable/c/27aa3e4b3088426b7e34584274ad45b5afaf7629
• https://git.kernel.org/stable/c/4143b9479caa29bb2380f3620dcbe16ea84eb3b1
• https://git.kernel.org/stable/c/7c1250796b6c262b505a46192f4716b8c6a6a8c6
• https://git.kernel.org/stable/c/c8b7b2f158d9d4fb89cd2f68244af154f7549bb4
• http://www.openwall.com/lists/oss-security/2024/05/08/4
• http://xenbits.xen.org/xsa/advisory-457.html
• https://git.kernel.org/stable/c/037965402a010898d34f4e35327d22c0a95cd51f
• https://git.kernel.org/stable/c/27aa3e4b3088426b7e34584274ad45b5afaf7629
• https://git.kernel.org/stable/c/4143b9479caa29bb2380f3620dcbe16ea84eb3b1
• https://git.kernel.org/stable/c/7c1250796b6c262b505a46192f4716b8c6a6a8c6
• https://git.kernel.org/stable/c/c8b7b2f158d9d4fb89cd2f68244af154f7549bb4