What’s Vulnerable › Vulnerabilities

CVE-2021-47330: tty: serial: 8250: serial_cs: Fix a memory leak in error handling path

• 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: 2024-05-21 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: tty: serial: 8250: serial_cs: Fix a memory leak in error handling path In the probe function, if the final 'serial_config()' fails, 'info' is leaking. Add a resource handling path to free this memory.

Affected products

• Linux kernel: before 4.4.276; from 4.5 before 4.9.276; from 4.10 before 4.14.240; from 4.15 before 4.19.198; from 4.20 before 5.4.134; from 5.5 before 5.10.52 — fixed in 4.14.240, 4.19.198, 4.4.276, 4.9.276, 5.10.52, 5.12.19

How to fix

Upgrade to a fixed version: Linux kernel 4.14.240, 4.19.198, 4.4.276, 4.9.276. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/331f5923fce4f45b8170ccf06c529e8eb28f37bc
• https://git.kernel.org/stable/c/34f4590f5ec9859ea9136249f528173d150bd584
• https://git.kernel.org/stable/c/7a80f71601af015856a0aeb1e3c294037ac3dd32
• https://git.kernel.org/stable/c/b2ef1f5de40342de44fc5355321595f91774dab5
• https://git.kernel.org/stable/c/b5a2799cd62ed30c81b22c23028d9ee374e2138c
• https://git.kernel.org/stable/c/c39cf4df19acf0133fa284a8cd83fad42cd13cc2
• https://git.kernel.org/stable/c/cddee5c287e26f6b2ba5c0ffdfc3a846f2f10461
• https://git.kernel.org/stable/c/ee16bed959862a6de2913f71a04cb563d7237b67
• https://git.kernel.org/stable/c/fad92b11047a748c996ebd6cfb164a63814eeb2e
• https://git.kernel.org/stable/c/331f5923fce4f45b8170ccf06c529e8eb28f37bc
• https://git.kernel.org/stable/c/34f4590f5ec9859ea9136249f528173d150bd584
• https://git.kernel.org/stable/c/7a80f71601af015856a0aeb1e3c294037ac3dd32

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