# CVE-2021-47105: linux: In the Linux kernel, the following vulnerability has been resolved:  ice: xsk: return xsk buffers back to pool when c...

CVE-2021-47105 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47105, released March 4, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47105
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 4, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  ice: xsk: return xsk buffers back to pool when cleaning the ring  Currently we only NULL the xdp_buff pointer in the internal SW ring but we never give it back to the xsk buffer pool. This means that buffers can be leaked out of the buff pool and never be used again.  Add missing xsk_buff_free() call to the routine that is supposed to clean the entries that are left in the ring so that these buffers in the umem can be used by other sockets.  Also, only go through the space that is actually left to be cleaned instead of a whole ring.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-47105](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47105.md) | Mar 4, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-47105](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47105.md) | Mar 4, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-47105](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47105.md) | Mar 4, 2024 |

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