Vulnerability Details CVE-2021-47239
In the Linux kernel, the following vulnerability has been resolved:
net: usb: fix possible use-after-free in smsc75xx_bind
The commit 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind")
fails to clean up the work scheduled in smsc75xx_reset->
smsc75xx_set_multicast, which leads to use-after-free if the work is
scheduled to start after the deallocation. In addition, this patch
also removes a dangling pointer - dev->data[0].
This patch calls cancel_work_sync to cancel the scheduled work and set
the dangling pointer to NULL.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.9%
CVSS Severity
CVSS v3 Score 7.8
References
- https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43d
- https://git.kernel.org/stable/c/2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b
- https://git.kernel.org/stable/c/4252bf6c2b245f47011098113d405ffad6ad5d5b
- https://git.kernel.org/stable/c/56b786d86694e079d8aad9b314e015cd4ac02a3d
- https://git.kernel.org/stable/c/570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb
- https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504
- https://git.kernel.org/stable/c/7cc8b2e05fcea6edd022d26e82091d781af8fd9b
- https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050b
- https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43d
- https://git.kernel.org/stable/c/2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b
- https://git.kernel.org/stable/c/4252bf6c2b245f47011098113d405ffad6ad5d5b
- https://git.kernel.org/stable/c/56b786d86694e079d8aad9b314e015cd4ac02a3d
- https://git.kernel.org/stable/c/570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb
- https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504
- https://git.kernel.org/stable/c/7cc8b2e05fcea6edd022d26e82091d781af8fd9b
- https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050b
Products affected by CVE-2021-47239
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cpe:2.3:o:linux:linux_kernel:4.14.235
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cpe:2.3:o:linux:linux_kernel:4.14.236
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cpe:2.3:o:linux:linux_kernel:4.14.237
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cpe:2.3:o:linux:linux_kernel:4.19.193
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cpe:2.3:o:linux:linux_kernel:4.19.194
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cpe:2.3:o:linux:linux_kernel:4.19.195
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cpe:2.3:o:linux:linux_kernel:4.4.271
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cpe:2.3:o:linux:linux_kernel:4.4.272
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cpe:2.3:o:linux:linux_kernel:4.4.273
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cpe:2.3:o:linux:linux_kernel:4.9.271
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cpe:2.3:o:linux:linux_kernel:4.9.272
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cpe:2.3:o:linux:linux_kernel:4.9.273
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cpe:2.3:o:linux:linux_kernel:5.10.42
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cpe:2.3:o:linux:linux_kernel:5.10.43
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cpe:2.3:o:linux:linux_kernel:5.10.44
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cpe:2.3:o:linux:linux_kernel:5.10.45
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cpe:2.3:o:linux:linux_kernel:5.12.10
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cpe:2.3:o:linux:linux_kernel:5.12.11
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cpe:2.3:o:linux:linux_kernel:5.12.12
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cpe:2.3:o:linux:linux_kernel:5.12.9
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cpe:2.3:o:linux:linux_kernel:5.4.124
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cpe:2.3:o:linux:linux_kernel:5.4.125
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cpe:2.3:o:linux:linux_kernel:5.4.126
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cpe:2.3:o:linux:linux_kernel:5.4.127