CVE-2021-47248: udp: fix race between close() and udp_abort()
First published: Tue May 21 2024(Updated: )
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>
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat Kernel-devel | ||
| Linux Kernel | >=4.9<4.9.274 | |
| Linux Kernel | >=4.10<4.14.238 | |
| Linux Kernel | >=4.15<4.19.196 | |
| Linux Kernel | >=4.20<5.4.128 | |
| Linux Kernel | >=5.5<5.10.46 | |
| Linux Kernel | >=5.11<5.12.13 | |
| Linux Kernel | =5.13-rc1 | |
| Linux Kernel | =5.13-rc2 | |
| Linux Kernel | =5.13-rc3 | |
| Linux Kernel | =5.13-rc4 | |
| Linux Kernel | =5.13-rc5 | |
| Linux Kernel | =5.13-rc6 |
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Reference Links
- https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400f
- https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69e
- https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1ad
- https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56
- https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeac
- https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241
- https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640e
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