CVE-2022-48939 bpf: Add schedule points in batch ops
Attackers can cause system soft lockups and hangs by triggering BPF batch operations on large datasets, requiring kernel patches to add schedule points.
- 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-2022-48939?
CVE-2022-48939 is a low-severity denial of service vulnerability in Linux kernel, published on 22 Aug 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:
bpf: Add schedule points in batch ops
syzbot reported various soft lockups caused by bpf batch operations.
INFO: task kworker/1:1:27 blocked for more than 140 seconds. INFO: task hung in rcu_barrier
Nothing prevents batch ops to process huge amount of data, we need to add schedule points in them.
Note that maybe_wait_bpf_programs(map) calls from generic_map_delete_batch() can be factorized by moving the call after the loop.
This will be done later in -next tree once we get this fix merged, unless there is strong opinion doing this optimization sooner.
Weakness: CWE-834
Which versions are affected by CVE-2022-48939?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48939?
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-2022-48939 being exploited?
There is no known exploitation of CVE-2022-48939 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48939, GHSA-pmwj-r76w-m8f7, UBUNTU-CVE-2022-48939.