# CVE-2026-53231: linux: In the Linux kernel, the following vulnerability has been resolved:  net: phy: don't try to setup PHY-driven SFP cage...

CVE-2026-53231 is fixed in linux on 1 platform by DEBIAN-CVE-2026-53231 (version 7.0.13-1), released June 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-53231
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0011
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 25, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: phy: don't try to setup PHY-driven SFP cages when using genphy  We don't have support for PHY-driver SFP cages with the genphy code.  On top of that, it was found by sashiko that running sfp_bus_add_upstream() for genphy deadlocks, as for genphy the PHY probing runs under RTNL, which isn't the case for non-genphy drivers.  This problem was reproduced, and does lead to a deadlock on RTNL.  Before the blamed commit, the phy_sfp_probe() call was made by individual PHY drivers, so there was no way to get to the SFP probing path when using genphy.  Let's therefore only run phy_sfp_probe when not using genphy.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.0.13-1 | [DEBIAN-CVE-2026-53231](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53231.md) | Jun 28, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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