# CVE-2021-47248: linux: In the Linux kernel, the following vulnerability has been resolved:  udp: fix race between close() and udp_abort()  K...

CVE-2021-47248 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47248, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47248
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## 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>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.46-1 | [DEBIAN-CVE-2021-47248](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47248.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.46-1 | [DEBIAN-CVE-2021-47248](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47248.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.10.46-1 | [DEBIAN-CVE-2021-47248](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47248.md) | May 21, 2024 |

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