Ubuntu.comUB:CVE-2021-47013CVE-2021-47013
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 |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | linux | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | linux | < 5.4.0-77.86 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-aws | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-aws | < 5.4.0-1051.53 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-aws-5.4 | < any | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-aws-hwe | < 4.15.0-1109.116~16.04.1 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-azure | < 5.4.0-1051.53 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-azure | < 4.15.0-1121.134~14.04.1 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-azure | < 4.15.0-1121.134~16.04.1 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-azure-4.15 | < any | UNKNOWN |
References
git.kernel.org/linus/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 (5.13-rc1)
git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834
git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d
git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57
git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7
git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d
git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955
git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322
git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b
launchpad.net/bugs/cve/CVE-2021-47013
nvd.nist.gov/vuln/detail/CVE-2021-47013
security-tracker.debian.org/tracker/CVE-2021-47013
www.cve.org/CVERecord?id=CVE-2021-47013
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