CVE-2021-47013Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tp…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.2 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.8%
0.8% → 0.8%
In the Linux kernel, the following vulnerability has been resolved:
net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send
In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len).
As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
linux_kernel >= 4.9, < 4.9.269linux_kernel >= 4.10, < 4.14.233linux_kernel >= 4.15, < 4.19.191linux_kernel >= 4.20, < 5.4.119linux_kernel >= 5.5, < 5.10.37linux_kernel >= 5.11, < 5.11.21linux_kernel >= 5.12, < 5.12.4Upgrade past the affected range:
linux_kernel 5.12.4Connected by shared product, vendor, weakness, or advisory.
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