CVE-2021-47001

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

28/02/2024

Last modified:

11/04/2025

Description

In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Fix cwnd update ordering After a reconnect, the reply handler is opening the cwnd (and thus enabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs() can post enough Receive WRs to receive their replies. This causes an RNR and the new connection is lost immediately. The race is most clearly exposed when KASAN and disconnect injection are enabled. This slows down rpcrdma_rep_create() enough to allow the send side to post a bunch of RPC Calls before the Receive completion handler can invoke ib_post_recv().

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 4.70 MEDIUM
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

4.70

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.38 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.11.22 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.12 (including)	5.12.5 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-47001

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools