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CVE-2021-47248

Disclosure Date: May 21, 2024 •
CVE-2021-47248
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Description

In the Linux kernel, the following vulnerability has been resolved:

udp: fix race between close() and udp_abort()

Kaustubh reported and diagnosed a panic in udp_lib_lookup().
The root cause is udp_abort() racing with close(). Both
racing functions acquire the socket lock, but udp{v6}_destroy_sock()
release it before performing destructive actions.

We can’t easily extend the socket lock scope to avoid the race,
instead use the SOCK_DEAD flag to prevent udp_abort from doing
any action when the critical race happens.

Diagnosed-and-tested-by: Kaustubh Pandey kapandey@codeaurora.org

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General Information

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Vulnerable Versions
Linux e3c36c773aed
Linux not down converted
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Vendors

  • Linux

Products

  • Linux
Technical Analysis