Kernel memory corruption via dangling SFP pointer
Published Jun 25, 2026 · Updated Jun 25, 2026
Use-after-free in the Linux Kernel PHY/SFP path allows physically proximate attackers to corrupt kernel memory through SFP events. The phy_sfp_probe() failure path omits sfp_bus_del_upstream(), leaving sfp_bus.upstream pointing to the failed PHY for later callbacks. Reachability requires an affected PHY/SFP configuration to enter the failed-probe state and then receive module-presence or link events from a directly connected SFP partner.
Summary
What happened
Use-after-free in the Linux Kernel PHY/SFP path allows physically proximate attackers to corrupt kernel memory through SFP events. The phy_sfp_probe() failure path omits sfp_bus_del_upstream(), leaving sfp_bus.upstream pointing to the failed PHY for later callbacks. Reachability requires an affected PHY/SFP configuration to enter the failed-probe state and then receive module-presence or link events from a directly connected SFP partner.
The record
- CVE
- CVE-2026-53232
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- Unavailable
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 25, 2026CVE publishedPublication date reported by the CVE source.
- Jun 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=298e54fa810e027f1b0800d789eb862592721f08 <48774e87bbaa0056819d4b52301e4692e50e3252
- Affected versionversion=5.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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