CVE-2021-47548

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.4%, top 31% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
68.8%
KEV
Not listed

Published

May 24, 2024

Last Modified

April 1, 2025

Advisory Details (7)

Auto-updated Jun 9, 2026
No patch confirmed yet.
generic

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/99bb25cb6753beaf2c2bc37927c2ecc0ceff3f6d
generic

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/948968f8747650447c8f21c9fdba0e1973be040b
generic

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/22519eff7df2d88adcc2568d86046ce1e2b52803
generic

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fc7ffa7f10b9454a86369405d9814bf141b30627
generic

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dd07f8971b81ad98cc754b179b331b57f35aa1ff
generic

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/abbd5faa0748d0aa95d5191d56ff7a17a6275bd1
generic

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a66998e0fbf213d47d02813b9679426129d0d114

Vendor Advisories for CVE-2021-47548(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-rt-0:4.18.0-553.16.1.rt7.357.el8_102024-08-08redhat
redhatkernel-0:4.18.0-553.16.1.el8_102024-08-08redhat
redhatkernel-0:4.18.0-372.113.1.el8_62024-07-29redhat
redhatkernel-0:4.18.0-477.64.1.el8_82024-07-23redhat
redhatkernel-0:5.14.0-427.26.1.el9_42024-07-17redhat
redhatkernel-rt-0:5.14.0-284.73.1.rt14.358.el9_22024-07-15redhat
redhatkernel-0:5.14.0-284.73.1.el9_22024-07-15redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 103 total refreshes for this CVE.

  1. 2026-07-23 02:06 UTCEG score recompute
  2. 2026-07-22 22:53 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-47548?
CVE-2021-47548 is a critical vulnerability published on May 24, 2024. In the Linux kernel, the following vulnerability has been resolved: ethernet: hisilicon: hns: hnsdsafmisc: fix a possible array overflow in hnsdsafgesrstby_port() The if statement: if (port >= DSAFGENUM) return; limits the value of port less than DSAFGENUM (i.e., 8). However, if the value of port…
When was CVE-2021-47548 disclosed?
CVE-2021-47548 was first published in the National Vulnerability Database on May 24, 2024, with the most recent update on April 1, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47548 actively exploited?
CVE-2021-47548 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 68.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-47548?
CVE-2021-47548 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-47548?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47548, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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