CVE-2021-47516 nfp: Fix memory leak in nfp_cpp_area_cache_add()
A memory leak in the Linux kernel's nfp driver can lead to resource exhaustion and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-47516?
CVE-2021-47516 is a medium-severity denial of service vulnerability in Linux kernel, published on 24 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
nfp: Fix memory leak in nfp_cpp_area_cache_add()
In line 800 (#1), nfp_cpp_area_alloc() allocates and initializes a CPP area structure. But in line 807 (#2), when the cache is allocated failed, this CPP area structure is not freed, which will result in memory leak.
We can fix it by freeing the CPP area when the cache is allocated failed (#2).
792 int nfp_cpp_area_cache_add(struct nfp_cpp *cpp, size_t size) 793 { 794 struct nfp_cpp_area_cache *cache; 795 struct nfp_cpp_area *area;
800 area = nfp_cpp_area_alloc(cpp, NFP_CPP_ID(7, NFP_CPP_ACTION_RW, 0), 801 0, size); // #1: allocates and initializes
802 if (!area) 803 return -ENOMEM;
805 cache = kzalloc(sizeof(*cache), GFP_KERNEL); 806 if (!cache) 807 return -ENOMEM; // #2: missing free
817 return 0; 818 }
Weakness: CWE-401
Which versions are affected by CVE-2021-47516?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47516?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-47516 being exploited?
There is no known exploitation of CVE-2021-47516 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47516, UBUNTU-CVE-2021-47516.