What’s Vulnerable › Vulnerabilities

CVE-2019-12819

• Severity: medium (CVSS 5.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-06-14 · updated 2026-06-17
• Weakness: CWE-416

Description

An issue was discovered in the Linux kernel before 5.0. The function __mdiobus_register() in drivers/net/phy/mdio_bus.c calls put_device(), which will trigger a fixed_mdio_bus_init use-after-free. This will cause a denial of service.

Affected products

• Linux kernel: before 5.0 — fixed in 5.0

How to fix

Upgrade to a fixed version: Linux kernel 5.0. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00039.html
• http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00040.html
• http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00048.html
• http://packetstormsecurity.com/files/154245/Kernel-Live-Patch-Security-Notice-LSN-0054-1.html
• http://www.securityfocus.com/bid/108768
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6ff7b060535e87c2ae14dd8548512abfdda528fb
• https://github.com/torvalds/linux/commit/6ff7b060535e87c2ae14dd8548512abfdda528fb
• https://security.netapp.com/advisory/ntap-20190710-0002/
• https://usn.ubuntu.com/4094-1/
• https://usn.ubuntu.com/4118-1/
• http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00039.html
• http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00040.html

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