SB20260815334 - Memory leak in Linux kernel net phy driver
Published: August 15, 2026
Security Bulletin ID
SB20260815334
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Memory leak (CVE-ID: CVE-2026-72391)
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a memory leak in sfp_i2c_mdiobus_destroy() when removing a copper or RollBall SFP module that instantiated an MDIO bus. A local user can trigger module hot-removal to cause a denial of service.
The issue is triggered on module hot-removal and not on driver unbind.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/2381bf3f484e8e4fd89a225445872ec14e036ab5
- https://git.kernel.org/stable/c/3183b6f5510c876a1c4b4a6bdc3d0ad8940fe742
- https://git.kernel.org/stable/c/86d379fcf1b79bdf4bc2ac891297f30f63d041d8
- https://git.kernel.org/stable/c/8f31efff9206f9f0adb853cad6916086aac4d5ef
- https://git.kernel.org/stable/c/92dd9a522f01ef57f633a8c1953cf6d48ef2bcd5
- https://git.kernel.org/stable/c/d2c37f26d1a37f8177be5f354537f8ee3ec31cc2