What’s Vulnerable › Vulnerabilities

CVE-2021-47164: net/mlx5e: Fix null deref accessing lag dev

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-25 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix null deref accessing lag dev It could be the lag dev is null so stop processing the event. In bond_enslave() the active/backup slave being set before setting the upper dev so first event is without an upper dev. After setting the upper dev with bond_master_upper_dev_link() there is a second event and in that event we have an upper dev.

Affected products

• Linux kernel: from 5.8 before 5.10.42; from 5.11 before 5.12.9 — fixed in 5.10.42, 5.12.9

How to fix

Upgrade to a fixed version: Linux kernel 5.10.42, 5.12.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2e4b0b95a489259f9d35a3db17023061f8f3d587
• https://git.kernel.org/stable/c/83026d83186bc48bb41ee4872f339b83f31dfc55
• https://git.kernel.org/stable/c/bdfd3593a8248eea6ecfcbf7b47b56b86515672d
• https://git.kernel.org/stable/c/2e4b0b95a489259f9d35a3db17023061f8f3d587
• https://git.kernel.org/stable/c/83026d83186bc48bb41ee4872f339b83f31dfc55
• https://git.kernel.org/stable/c/bdfd3593a8248eea6ecfcbf7b47b56b86515672d

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