7.5

CVE-2021-47001: linux

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-47001DEBIAN-CVE-2021-47001
Published 28-02-2024Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2021-47001 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.75% chance of exploitation in the next 30 days, higher than 54.1% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.75%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 8
SUSE-SU-2024:1465-1SUSE-SU-2024:1489-1USN-7173-1USN-7173-2USN-7173-3USN-7195-1

Timeline

  1. 28-02-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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().

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.75%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

+0.01 pp

From 0.74% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.75%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu86 products
  • linux< 5.4.0-204.224
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1137.147
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 2ae50ad68cd79224198b525f7bd645c9da98b6ff, < eddae8be7944096419c2ae29477a45f767d0fcd4 | ≥ 2ae50ad68cd79224198b525f7bd645c9da98b6ff, < 8834ecb5df22b7ff3c9b0deba7726579bb613f95 | ≥ 2ae50ad68cd79224198b525f7bd645c9da98b6ff, < 19b5fa9489b5706bc878c3a522a7f771079e2fa0 | ≥ 2ae50ad68cd79224198b525f7bd645c9da98b6ff, < 35d8b10a25884050bb3b0149b62c3818ec59f77c | 3791c5982ba1eebf2900ee7ca7b9a89619c26d54 | ≥ 5.4.13, < 5.5 | 5.5
  • linux_kernel≥ 5.5, < 5.10.38 | ≥ 5.11, < 5.11.22 | ≥ 5.12, < 5.12.5
Debian1 product
  • linux< 5.10.38-1

3 vendors · 89 products

References

15 links
Show all 15 references