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Unrated severityNVD Advisory· Published Apr 3, 2024· Updated Nov 3, 2025

net/sched: act_mirred: don't override retval if we already lost the skb

CVE-2024-26739

Description

In the Linux kernel, the following vulnerability has been resolved:

net/sched: act_mirred: don't override retval if we already lost the skb

If we're redirecting the skb, and haven't called tcf_mirred_forward(), yet, we need to tell the core to drop the skb by setting the retcode to SHOT. If we have called tcf_mirred_forward(), however, the skb is out of our hands and returning SHOT will lead to UaF.

Move the retval override to the error path which actually need it.

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