What’s Vulnerable › Vulnerabilities

CVE-2021-47311: net: qcom/emac: fix UAF in emac_remove

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-21 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: net: qcom/emac: fix UAF in emac_remove adpt is netdev private data and it cannot be used after free_netdev() call. Using adpt after free_netdev() can cause UAF bug. Fix it by moving free_netdev() at the end of the function.

Affected products

• Linux kernel: from 4.9 before 4.9.277; from 4.10 before 4.14.241; from 4.15 before 4.19.199; from 4.20 before 5.4.135; from 5.5 before 5.10.53; from 5.11 before 5.13.5 — fixed in 4.14.241, 4.19.199, 4.9.277, 5.10.53, 5.13.5, 5.4.135

How to fix

Upgrade to a fixed version: Linux kernel 4.14.241, 4.19.199, 4.9.277, 5.10.53. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/11e9d163d631198bb3eb41a677a61b499516c0f7
• https://git.kernel.org/stable/c/2b70ca92847c619d6264c7372ef74fcbfd1e048c
• https://git.kernel.org/stable/c/4d04a42b926e682140776e54188f4a44f1f01a81
• https://git.kernel.org/stable/c/8a225a6e07a57a1538d53637cb3d82bd3e477839
• https://git.kernel.org/stable/c/ad297cd2db8953e2202970e9504cab247b6c7cb4
• https://git.kernel.org/stable/c/b1e091331920f8fbfc747dcbd16263fcd71abb2d
• https://git.kernel.org/stable/c/b560521eca03d0a2db6093a5a632cbdd0a0cf833
• https://git.kernel.org/stable/c/11e9d163d631198bb3eb41a677a61b499516c0f7
• https://git.kernel.org/stable/c/2b70ca92847c619d6264c7372ef74fcbfd1e048c
• https://git.kernel.org/stable/c/4d04a42b926e682140776e54188f4a44f1f01a81
• https://git.kernel.org/stable/c/8a225a6e07a57a1538d53637cb3d82bd3e477839
• https://git.kernel.org/stable/c/ad297cd2db8953e2202970e9504cab247b6c7cb4

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