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CVE-2021-47013 is a use-after-free flaw in the Linux kernel EMAC network driver’s emac_mac_tx_buf_send transmit path. The function invokes emac_tx_fill_tpd() with an skb. When emac_tx_fill_tpd() encounters an error, it frees the skb, but the caller subsequently dereferences skb->len while reporting transmit-queue activity. The fix saves the packet length before the call that can free the skb and uses the saved value thereafter.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel use-after-free in the emac_mac_tx_buf_send networking driver function.
Linux kernel EMAC transmit-buffer use-after-free vulnerability.
A use-after-free vulnerability in the Linux kernel's emac/emac-mac network driver, in emac_mac_tx_buf_send().
Linux kernel EMAC network-driver use-after-free vulnerability.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.