CVE-2017-7979 Denial of service in n/a
Local users can cause a system hang or crash via uninitialized memory access in the Linux kernel packet action API.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-7979?
CVE-2017-7979 is a high-severity denial of service vulnerability in Linux kernel, published on 19 Apr 2017. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The cookie feature in the packet action API implementation in net/sched/act_api.c in the Linux kernel 4.11.x through 4.11-rc7 mishandles the tb nlattr array, which allows local users to cause a denial of service (uninitialized memory access and refcount underflow, and system hang or crash) or possibly have unspecified other impact via "tc filter add" commands in certain contexts. NOTE: this does not affect stable kernels, such as 4.10.x, from kernel.org.
Weakness: CWE-20
Which versions are affected by CVE-2017-7979?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2017-7979?
No fix has been published for CVE-2017-7979 yet. Limit exposure of the affected software until one is available.
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-2017-7979 being exploited?
There is no known exploitation of CVE-2017-7979 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as GHSA-94wh-pgqj-7f7r.