Vulnerability 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]>
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.9, < 4.9.274 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1adPatch
- https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56Patch
- https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241Patch
- https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeacPatch
- https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69ePatch
- https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640ePatch
- https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400fPatch
- https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1adPatch
- https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56Patch
- https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241Patch
- https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeacPatch
- https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69ePatch
- https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640ePatch
- https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400fPatch
FAQ
What is CVE-2021-47248?
CVE-2021-47248 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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_a...
How severe is CVE-2021-47248?
CVE-2021-47248 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47248?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.