GHSA-jr8j-2jhp-m67v nftables binding to an already bound chain
A local attacker can cause a denial of service in the Linux kernel by binding to an already bound nftables chain.
- 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 GHSA-jr8j-2jhp-m67v?
GHSA-jr8j-2jhp-m67v is a denial of service vulnerability in github.com/siderolabs/talos, published on 16 Sep 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Impact
An issue was discovered in net/netfilter/nf_tables_api.c in the Linux kernel. A denial of service can occur upon binding to an already bound chain.
Affected by this vulnerability is the function nft_verdict_init of the file net/netfilter/nf_tables_api.c. The manipulation with an unknown input leads to a denial of service vulnerability. The program does not release or incorrectly releases a resource before it is made available for re-use.
Patches
The fix has been backported to 5.15.64 version of the upstream Linux kernel (5.15 is the upstream Kernel long term version Talos ships with). Talos >= v1.2.0 is shipped with Linux Kernel 5.15.64 fixing the above issue.
Workarounds
It's recommended to upgrade
References
- https://www.sesin.at/2022/09/02/cve-2022-39190-linux-kernel-up-to-5-19-5-nf_tables_api-c-nft_verdict_init-denial-of-service/
- https://nvd.nist.gov/vuln/detail/CVE-2022-39190
For more information
- Email us at [email protected]
Which versions are affected by GHSA-jr8j-2jhp-m67v?
2 open source packages ship an affected version, including github.com/siderolabs/talos.
| Package | Affected | Fixed in |
|---|---|---|
github.com/siderolabs/talos Go | All versions | 1.2.0 |
github.com/siderolabs/talos Go | All versions | 1.2.0 |
How do I fix GHSA-jr8j-2jhp-m67v?
Upgrade github.com/siderolabs/talos to 1.2.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is GHSA-jr8j-2jhp-m67v being exploited?
There is no known exploitation of GHSA-jr8j-2jhp-m67v in the wild and no public exploit code.