CVE-2021-47520: can: pch_can: pch_can_rx_normal: fix use after free
First published: Fri May 24 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: can: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is dereferenced just after the call netif_receive_skb(skb). Reordering the lines solves the issue.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=2.6.37<4.4.295 | |
| Linux Linux kernel | >=4.5<4.9.293 | |
| Linux Linux kernel | >=4.10<4.14.258 | |
| Linux Linux kernel | >=4.15<4.19.221 | |
| Linux Linux kernel | >=4.20<5.4.165 | |
| Linux Linux kernel | >=5.5<5.10.85 | |
| Linux Linux kernel | >=5.11<5.15.8 |
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Reference Links
- https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d
- https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76
- https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3
- https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa
- https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4
- https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e
- https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7
- https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db
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- version/linux linux kernel/2.6.37
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- version/linux linux kernel/5.11