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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 12 | all | linux | < 5.10.38-1 | linux_5.10.38-1_all.deb |
Debian | 11 | all | linux | < 5.10.38-1 | linux_5.10.38-1_all.deb |
Debian | 10 | all | linux | < 4.19.194-1 | linux_4.19.194-1_all.deb |
Debian | 999 | all | linux | < 5.10.38-1 | linux_5.10.38-1_all.deb |
Debian | 13 | all | linux | < 5.10.38-1 | linux_5.10.38-1_all.deb |