net: phy: don't try to setup PHY-driven SFP cages when using genphy

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Summary

CVECVE-2026-53231
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:41 UTC
Updated2026-07-02 20:44:05 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000870000 probability, percentile 0.004620000 (date 2026-07-05)

Problem Types: CWE-667

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel 7.1 rc1 All All
Operating System Linux Linux Kernel 7.1 rc2 All All
Operating System Linux Linux Kernel 7.1 rc3 All All
Operating System Linux Linux Kernel 7.1 rc4 All All
Operating System Linux Linux Kernel 7.1 rc5 All All
Operating System Linux Linux Kernel 7.1 rc6 All All
Operating System Linux Linux Kernel 7.1 rc7 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bad869b5e41a08424ff130fd6bb41b854be70095 ef8d739eee6f85303cbecebc01eb72f063de74e0 git Not specified
CNA Linux Linux affected bad869b5e41a08424ff130fd6bb41b854be70095 5a0082ec20a05ef2378410323a5089a8f1786f4a git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5a0082ec20a05ef2378410323a5089a8f1786f4a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ef8d739eee6f85303cbecebc01eb72f063de74e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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