CVE-2026-31658 net: altera-tse: fix skb leak on DMA mapping error in tse_start_xmit()
A memory leak in the Altera TSE network driver allows attackers to cause denial of service by triggering DMA mapping failures.
- 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-2026-31658?
CVE-2026-31658 is a medium-severity denial of service vulnerability in Linux kernel, published on 24 Apr 2026. 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:
net: altera-tse: fix skb leak on DMA mapping error in tse_start_xmit()
When dma_map_single() fails in tse_start_xmit(), the function returns NETDEV_TX_OK without freeing the skb. Since NETDEV_TX_OK tells the stack the packet was consumed, the skb is never freed, leaking memory on every DMA mapping failure.
Add dev_kfree_skb_any() before returning to properly free the skb.
Weakness: CWE-401
Which versions are affected by CVE-2026-31658?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31658?
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-2026-31658 being exploited?
There is no known exploitation of CVE-2026-31658 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-83891, BELL-CVE-2026-31658, DEBIAN-CVE-2026-31658, GHSA-fm9r-m74h-jfjj, ROOT-OS-DEBIAN-11-CVE-2026-31658, ROOT-OS-DEBIAN-12-CVE-2026-31658 and 3 more.