# CVE-2023-52505: linux: In the Linux kernel, the following vulnerability has been resolved:  phy: lynx-28g: serialize concurrent phy_set_mode...

CVE-2023-52505 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52505, released March 2, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-52505
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 2, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  phy: lynx-28g: serialize concurrent phy_set_mode_ext() calls to shared registers  The protocol converter configuration registers PCC8, PCCC, PCCD (implemented by the driver), as well as others, control protocol converters from multiple lanes (each represented as a different struct phy). So, if there are simultaneous calls to phy_set_mode_ext() to lanes sharing the same PCC register (either for the "old" or for the "new" protocol), corruption of the values programmed to hardware is possible, because lynx_28g_rmw() has no locking.  Add a spinlock in the struct lynx_28g_priv shared by all lanes, and take the global spinlock from the phy_ops :: set_mode() implementation. There are no other callers which modify PCC registers.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.64-1 | [DEBIAN-CVE-2023-52505](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52505.md) | Mar 2, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.5.8-1 | [DEBIAN-CVE-2023-52505](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52505.md) | Mar 2, 2024 |
| Linux | linux Debian 14 | 6.5.8-1 | [DEBIAN-CVE-2023-52505](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52505.md) | Mar 2, 2024 |

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