CVE-2026-72017: net: macb: drop in-flight Tx SKBs on close
In the Linux kernel, the following vulnerability has been resolved:
net: macb: drop in-flight Tx SKBs on close
The MACB driver has since forever leaked the outgoing SKBs that have not yet been marked as completed. They live in queue->txskb which gets freed without remorse nor checking.
macbfreeconsistent() gets called in a few codepaths, but only close will trigger the added expressions. In macbopen() and macballocconsistent() failure cases, queues' txskb just got allocated and are empty.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-72017?
CVE-2026-72017 has been assigned a risk score of 12.
What systems are affected by CVE-2026-72017?
CVE-2026-72017 affects systems running the Linux kernel that utilizes the MACB driver.
How do I fix CVE-2026-72017?
To fix CVE-2026-72017, update your Linux kernel to the latest version where this vulnerability has been patched.
What type of vulnerability is CVE-2026-72017?
CVE-2026-72017 is a memory leak vulnerability related to the outgoing SKBs in the MACB driver.
What could be the impact of exploiting CVE-2026-72017?
Exploiting CVE-2026-72017 could lead to resource exhaustion due to leaked outgoing SKBs.