CVE-2021-47013: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send
First published: Wed Feb 28 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.9.269 | 4.9.269 |
| redhat/kernel | <4.14.233 | 4.14.233 |
| redhat/kernel | <4.19.191 | 4.19.191 |
| redhat/kernel | <5.4.119 | 5.4.119 |
| redhat/kernel | <5.10.37 | 5.10.37 |
| redhat/kernel | <5.11.21 | 5.11.21 |
| redhat/kernel | <5.12.4 | 5.12.4 |
| redhat/kernel | <5.13 | 5.13 |
| Linux Linux kernel | >=4.9<4.9.269 | |
| Linux Linux kernel | >=4.10<4.14.233 | |
| Linux Linux kernel | >=4.15<4.19.191 | |
| Linux Linux kernel | >=4.20<5.4.119 | |
| Linux Linux kernel | >=5.5<5.10.37 | |
| Linux Linux kernel | >=5.11<5.11.21 | |
| Linux Linux kernel | >=5.12<5.12.4 |
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Reference Links
- https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834
- https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d
- https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57
- https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7
- https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d
- https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955
- https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322
- https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b
- https://access.redhat.com/security/cve/CVE-2021-47013
- https://lore.kernel.org/linux-cve-announce/2024022831-CVE-2021-47013-034a@gregkh/T/#u
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2266842
- https://access.redhat.com/errata/RHSA-2024:3462
- https://access.redhat.com/errata/RHSA-2024:3618
- https://access.redhat.com/errata/RHSA-2024:3627
- https://access.redhat.com/errata/RHSA-2024:3810
- https://bugzilla.redhat.com/show_bug.cgi?id=2266841
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