What’s Vulnerable › Vulnerabilities

CVE-2021-47049: Drivers: hv: vmbus: Use after free in __vmbus_open()

• 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: 2024-02-28 · updated 2026-08-04
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Use after free in __vmbus_open() The "open_info" variable is added to the &vmbus_connection.chn_msg_list, but the error handling frees "open_info" without removing it from the list. This will result in a use after free. First remove it from the list, and then free it.

Affected products

• Linux kernel: from 4.14 before 5.10.37; from 5.11 before 5.11.21; from 5.12 before 5.12.4 — fixed in 5.10.37, 5.11.21, 5.12.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.37, 5.11.21, 5.12.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2728f289b3270b0e273292b46c534421a33bbfd5
• https://git.kernel.org/stable/c/3e9bf43f7f7a46f21ec071cb47be92d0874c48da
• https://git.kernel.org/stable/c/d5c7b42c9f56ca46b286daa537d181bd7f69214f
• https://git.kernel.org/stable/c/f37dd5d1b5d38a79a4f7b8dd7bbb705505f05560
• https://git.kernel.org/stable/c/2728f289b3270b0e273292b46c534421a33bbfd5
• https://git.kernel.org/stable/c/3e9bf43f7f7a46f21ec071cb47be92d0874c48da
• https://git.kernel.org/stable/c/d5c7b42c9f56ca46b286daa537d181bd7f69214f
• https://git.kernel.org/stable/c/f37dd5d1b5d38a79a4f7b8dd7bbb705505f05560

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