What’s Vulnerable › Vulnerabilities

CVE-2026-72017: net: macb: drop in-flight Tx SKBs on close

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-23

Description

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->tx_skb which gets freed without remorse nor checking. macb_free_consistent() gets called in a few codepaths, but only close will trigger the added expressions. In macb_open() and macb_alloc_consistent() failure cases, queues' tx_skb just got allocated and are empty.

Affected products

• Linux kernel: 2.6.20 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0e9797dc4ebdefe1b7f931b1f92d5e98e5dbf655
• https://git.kernel.org/stable/c/109241d9880488aafd8e104832b4d4859ad57244
• https://git.kernel.org/stable/c/2143fdc0ce27adbb1caaa1a97e0bfb9f3750aef4
• https://git.kernel.org/stable/c/26b131b2d5b55a81ef6182769d28105a870c0eb2
• https://git.kernel.org/stable/c/27f575836cfebbf872dec020428742b10650a955
• https://git.kernel.org/stable/c/6124bd785073659c99385094657b77382ebce11b

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