CVE-2021-47024 - CVE House
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Status published Medium CVE-2021-47024

vsock/virtio: free queued packets when closing socket

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: free queued packets when closing socket As reported by syzbot [1], there is a memory leak while closing the socket. We partially solved this issue with commit ac03046ece2b ("vsock/virtio: free packets during the socket release"), but we forgot to drain the RX queue when the socket is definitely closed by the scheduled work. To avoid future issues, let's use the new virtio_transport_remove_sock() to drain the RX queue before removing the socket from the af_vsock lists calling vsock_remove_sock(). [1] https://syzkaller.appspot.com/bug?extid=24452624fc4c571eedd9

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
ac03046ece2b158ebd204dfc4896fd9f39f0e6c8, 4ea082cd3c400cd5bb36a7beb7e441bf3e29350d, 4e539fa2dec4db3405e47002f2878aa4a99eb68b, 4af8a327aeba102aaa9b78f3451f725bc590b237, 51adb8ebe8c1d80528fc2ea863cfea9d32d2c52b, 7d29c9ad0ed525c1b10e29cfca4fb1eece1e93fb, 4.9.179, 4.14.122, 4.19.46, 5.0.19, 5.1.5, 5.2, 0, 5.10.37, 5.11.21, 5.12.4, 5.13

Timeline

Official Publish: February 28th, 2024
Last Modified: May 23rd, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.