CVE-2021-47248
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 <[email protected]>
How to fix
- linux linux_kernel4.9.274, 4.14.238, 4.19.196, 5.4.128, 5.10.46, 5.12.13 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.9 ≤ v < 4.9.274, 4.10 ≤ v < 4.14.238, 4.15 ≤ v < 4.19.196, 4.20 ≤ v < 5.4.128, 5.5 ≤ v < 5.10.46, 5.11 ≤ v < 5.12.13, 5.13 | 4.9.274, 4.14.238, 4.19.196, 5.4.128, 5.10.46, 5.12.13 |
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