CVE-2026-74495: igbvf: Fix leak in TX DMA error cleanup
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 dmaerror is reached. Decrementing count before the while loop in dmaerror 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 dmaerror. All other affected drivers have already been fixed.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-74495?
CVE-2026-74495 has a severity rating of 14.
How do I fix CVE-2026-74495?
To fix CVE-2026-74495, ensure that you update to the latest version of the Linux kernel where this vulnerability has been resolved.
What systems are affected by CVE-2026-74495?
CVE-2026-74495 affects systems running the vulnerable versions of the Linux kernel that include the igbvf driver.
What is the impact of CVE-2026-74495?
The impact of CVE-2026-74495 includes potential leaks during TX DMA error cleanup in the igbvf driver.
Is there a known exploit for CVE-2026-74495?
As of now, there are no known exploits for CVE-2026-74495, but it is important to apply the fix to prevent any potential risks.