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Review reviewHigh

CVE-2021-47049

Linux Linux, linux kernel

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.

CVSS
7.8
EPSS
0.23%
14.1% percentile
CISA KEV
Not listed
Published
2024.02.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.23%
Technical severityCVSS 7.8

Vulnerability overview

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 product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 6f3d791f300618caf82a2be0c27456edd76d5164 < d5c7b42c9f56ca46b286daa537d181bd7f69214f, >= 6f3d791f300618caf82a2be0c27456edd76d5164 < f37dd5d1b5d38a79a4f7b8dd7bbb705505f05560, >= 6f3d791f300618caf82a2be0c27456edd76d5164 < 2728f289b3270b0e273292b46c534421a33bbfd5, >= 6f3d791f300618caf82a2be0c27456edd76d5164 < 3e9bf43f7f7a46f21ec071cb47be92d0874c48da, >= 6b32d45bd59982751beb8220e442b40b2706647f, >= 4.13.9 < 4.14, >= 4.14, >= 4.14 < 5.10.37, >= 5.11 < 5.11.21, >= 5.12 < 5.12.4
Fixed versions
5.10.37, 5.11.21, 5.12.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416