# CVE-2021-46973: linux: In the Linux kernel, the following vulnerability has been resolved:  net: qrtr: Avoid potential use after free in MHI...

CVE-2021-46973 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-46973, released February 27, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-46973
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 27, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: qrtr: Avoid potential use after free in MHI send  It is possible that the MHI ul_callback will be invoked immediately following the queueing of the skb for transmission, leading to the callback decrementing the refcount of the associated sk and freeing the skb.  As such the dereference of skb and the increment of the sk refcount must happen before the skb is queued, to avoid the skb to be used after free and potentially the sk to drop its last refcount..

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-46973](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46973.md) | Feb 27, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-46973](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46973.md) | Feb 27, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-46973](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46973.md) | Feb 27, 2024 |

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