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CVE-2022-49956: staging: rtl8712: fix use after free bugs

• Severity: high (CVSS 7.8 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: 2025-06-18 · updated 2026-08-04
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8712: fix use after free bugs _Read/Write_MACREG callbacks are NULL so the read/write_macreg_hdl() functions don't do anything except free the "pcmd" pointer. It results in a use after free. Delete them.

Affected products

• Linux kernel: from 2.6.37 before 4.9.328; from 4.10 before 4.14.293; from 4.15 before 4.19.258; from 4.20 before 5.4.213; from 5.5 before 5.10.142; from 5.11 before 5.15.66 — fixed in 4.14.293, 4.19.258, 4.9.328, 5.10.142, 5.15.66, 5.19.8

How to fix

Upgrade to a fixed version: Linux kernel 4.14.293, 4.19.258, 4.9.328, 5.10.142. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/19e3f69d19801940abc2ac37c169882769ed9770
• https://git.kernel.org/stable/c/376e15487fec837301d888068a3fcc82efb6171a
• https://git.kernel.org/stable/c/7dce6b0ee7d78667d6c831ced957a08769973063
• https://git.kernel.org/stable/c/9fd6170c5e2d0ccd027abe26f6f5ffc528e1bb27
• https://git.kernel.org/stable/c/b1727def850904e4b8ba384043775672841663a1
• https://git.kernel.org/stable/c/d0aac7146e96bf39e79c65087d21dfa02ef8db38
• https://git.kernel.org/stable/c/dc02aaf950015850e7589696521c7fca767cea77
• https://git.kernel.org/stable/c/e230a4455ac3e9b112f0367d1b8e255e141afae0

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