9.8

CVE-2021-47548: ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port()

Analyzed
AliasesUBUNTU-CVE-2021-47548DEBIAN-CVE-2021-47548
Published 24-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47548 is a critical (CVSS 9.8) Improper Validation of Array Index vulnerability in linux. EPSS estimates a 1.36% chance of exploitation in the next 30 days, higher than 71.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
1.36%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 6
RHSA-2024:4533RHSA-2024:4554RHSA-2024:4583RHSA-2024:4740RHSA-2024:4902RHSA-2024:5101

Timeline

  1. 24-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() The if statement: if (port >= DSAF_GE_NUM) return; limits the value of port less than DSAF_GE_NUM (i.e., 8). However, if the value of port is 6 or 7, an array overflow could occur: port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off; because the length of dsaf_dev->mac_cb is DSAF_MAX_PORT_NUM (i.e., 6). To fix this possible array overflow, we first check port and if it is greater than or equal to DSAF_MAX_PORT_NUM, the function returns.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

1.36%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.36% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu87 products
  • linux< 4.15.0-169.177 | < 5.4.0-100.113
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.15.0-1121.129 | < 5.4.0-1066.69
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca, < 948968f8747650447c8f21c9fdba0e1973be040b | ≥ 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca, < abbd5faa0748d0aa95d5191d56ff7a17a6275bd1 | ≥ 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca, < dd07f8971b81ad98cc754b179b331b57f35aa1ff | ≥ 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca, < 99bb25cb6753beaf2c2bc37927c2ecc0ceff3f6d | ≥ 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca, < 22519eff7df2d88adcc2568d86046ce1e2b52803 | ≥ 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca, < fc7ffa7f10b9454a86369405d9814bf141b30627 | ≥ 850bfa3b78ea8849fef78ed74f5f2ccf947db0ca, < a66998e0fbf213d47d02813b9679426129d0d114 | 4.7
  • linux_kernel< 4.9.292 | ≥ 4.10, < 4.14.257 | ≥ 4.15, < 4.19.220 | ≥ 4.20, < 5.4.164 | ≥ 5.5, < 5.10.84 | ≥ 5.11, < 5.15.7 | 5.16:rc1
Debian1 product
  • linux< 5.15.15-1

3 vendors · 90 products

References

11 links
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