What’s Vulnerable › Vulnerabilities

CVE-2021-46911: ch_ktls: Fix kernel panic

• Severity: medium (CVSS 5.5 v3.1)
• 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: 2024-02-27 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: ch_ktls: Fix kernel panic Taking page refcount is not ideal and causes kernel panic sometimes. It's better to take tx_ctx lock for the complete skb transmit, to avoid page cleanup if ACK received in middle.

Affected products

• Linux kernel: from 5.7.0 before 5.10.32; from 5.11.0 before 5.11.16 — fixed in 5.10.32, 5.11.16

How to fix

Upgrade to a fixed version: Linux kernel 5.10.32, 5.11.16. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1a73e427b824133940c2dd95ebe26b6dce1cbf10
• https://git.kernel.org/stable/c/8348665d4181c68b0ca1205b48e1753d78bc810f
• https://git.kernel.org/stable/c/8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091f
• https://git.kernel.org/stable/c/1a73e427b824133940c2dd95ebe26b6dce1cbf10
• https://git.kernel.org/stable/c/8348665d4181c68b0ca1205b48e1753d78bc810f
• https://git.kernel.org/stable/c/8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091f

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