CVE-2025-38190 atm: Revert atm_account_tx() if copy_from_iter_full() fails.
A missing resource reversion in the Linux kernel ATM subsystem allows attackers to leak sockets, potentially causing 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-2025-38190?
CVE-2025-38190 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 4 Jul 2025. 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:
atm: Revert atm_account_tx() if copy_from_iter_full() fails.
In vcc_sendmsg(), we account skb->truesize to sk->sk_wmem_alloc by atm_account_tx().
It is expected to be reverted by atm_pop_raw() later called by vcc->dev->ops->send(vcc, skb).
However, vcc_sendmsg() misses the same revert when copy_from_iter_full() fails, and then we will leak a socket.
Let's factorise the revert part as atm_return_tx() and call it in the failure path.
Note that the corresponding sk_wmem_alloc operation can be found in alloc_tx() as of the blamed commit.
$ git blame -L:alloc_tx net/atm/common.c c55fa3cccbc2c~
Which versions are affected by CVE-2025-38190?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-38190?
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-2025-38190 being exploited?
There is no known exploitation of CVE-2025-38190 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-64761, BELL-CVE-2025-38190, DEBIAN-CVE-2025-38190, GHSA-pj7v-5fgv-5fg6, ROOT-OS-DEBIAN-11-CVE-2025-38190, ROOT-OS-DEBIAN-12-CVE-2025-38190 and 3 more.