CVE-2026-74495 igbvf: Fix leak in TX DMA error cleanup
A memory leak in the igbvf driver's TX DMA error handling can lead to resource exhaustion and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74495?
CVE-2026-74495 is a critical memory corruption vulnerability in Linux, published on 15 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
igbvf: Fix leak in TX DMA error cleanup
If an error is encountered while mapping TX buffers, the driver should unmap any buffers already mapped for that skb.
Because count is incremented before each frag mapping, it will always match the correct number of unmappings needed when dma_error is reached. Decrementing count before the while loop in dma_error causes an off-by-one error. If any mapping was successful before an unsuccessful mapping, exactly one DMA mapping (the head) would leak.
This bug was introduced by a 2010 fix for an endless loop in dma_error. All other affected drivers have already been fixed.
Which versions are affected by CVE-2026-74495?
How do I fix CVE-2026-74495?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-74495 being exploited?
There is no known exploitation of CVE-2026-74495 in the wild and no public exploit code.
Sources
Also known as AZL-96299, BELL-CVE-2026-74495, DEBIAN-CVE-2026-74495, GHSA-7vcq-2p5f-22mh, UBUNTU-CVE-2026-74495.