# CVE-2022-48809: linux: In the Linux kernel, the following vulnerability has been resolved:  net: fix a memleak when uncloning an skb dst and...

CVE-2022-48809 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48809, released July 16, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48809
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 16, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: fix a memleak when uncloning an skb dst and its metadata  When uncloning an skb dst and its associated metadata, a new dst+metadata is allocated and later replaces the old one in the skb. This is helpful to have a non-shared dst+metadata attached to a specific skb.  The issue is the uncloned dst+metadata is initialized with a refcount of 1, which is increased to 2 before attaching it to the skb. When tun_dst_unclone returns, the dst+metadata is only referenced from a single place (the skb) while its refcount is 2. Its refcount will never drop to 0 (when the skb is consumed), leading to a memory leak.  Fix this by removing the call to dst_hold in tun_dst_unclone, as the dst+metadata refcount is already 1.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.10-1 | [DEBIAN-CVE-2022-48809](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48809.md) | Jul 16, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.10-1 | [DEBIAN-CVE-2022-48809](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48809.md) | Jul 16, 2024 |
| Linux | linux Debian 14 | 5.16.10-1 | [DEBIAN-CVE-2022-48809](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48809.md) | Jul 16, 2024 |

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