CVE-2021-47015

System crash via stale RX consumer index

Published Feb 28, 2024 · Updated May 23, 2026

Denial of service in affected Linux kernel versions allows local users to crash systems through the bnxt_en receive path. In bnxt_rx_pkt(), an out-of-order completion passes the stale raw_cons index, rather than tmp_raw_cons, to bnxt_discard_rx(), leaving the abort loop at the wrong RX buffer. Reaching the fault requires a Broadcom bnxt_en device to report out-of-order RX completion; the resulting bad access can panic the kernel.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Linux kernel versions allows local users to crash systems through the bnxt_en receive path. In bnxt_rx_pkt(), an out-of-order completion passes the stale raw_cons index, rather than tmp_raw_cons, to bnxt_discard_rx(), leaving the abort loop at the wrong RX buffer. Reaching the fault requires a Broadcom bnxt_en device to report out-of-order RX completion; the resulting bad access can panic the kernel.

The record

CVE
CVE-2021-47015
Published
Feb 28, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 28, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.14.112 <4.15
  2. Affected versionversion=4.19.35 <4.20
  3. Affected versionversion=46281ee85b651b0df686001651b965d17b8e2c67
  4. Affected versionversion=4.9.169 <4.10
  5. Affected versionversion=5.0.8 <5.1
  6. Affected versionversion=5.1
  7. Affected versionversion=8e302e8e10b05165ed21273539a1e6a83ab93e9e
  8. Affected versionversion=a1b0e4e684e9c300b9e759b46cb7a0147e61ddff <3fbc5bc651d688fbea2a59cdc91520a2f5334d0a
  9. Affected versionversion=a1b0e4e684e9c300b9e759b46cb7a0147e61ddff <4fcaad2b7dac3f16704f8118c7e481024ddbd3ed
  10. Affected versionversion=a1b0e4e684e9c300b9e759b46cb7a0147e61ddff <b1523e4ba293b2a32d9fabaf70c1dcaa6e3e2847
  11. Affected versionversion=a1b0e4e684e9c300b9e759b46cb7a0147e61ddff <bbd6f0a948139970f4a615dff189d9a503681a39
  12. Affected versionversion=a1b0e4e684e9c300b9e759b46cb7a0147e61ddff <e187ef83c04a5d23e68d39cfdff1a1931e29890c
  13. Affected versionversion=aecbbae850ede49183fa0b73c7445531a47669cf
  14. Affected versionversion=d2d055a554036b0240f296743942b8111fd4ce97

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14.112 <4.15; version=4.19.35 <4.20; version=46281ee85b651b0df686001651b965d17b8e2c67; version=4.9.169 <4.10; version=5.0.8 <5.1; version=5.1; version=8e302e8e10b05165ed21273539a1e6a83ab93e9e; version=a1b0e4e684e9c300b9e759b46cb7a0147e61ddff <3fbc5bc651d688fbea2a59cdc91520a2f5334d0a; version=a1b0e4e684e9c300b9e759b46cb7a0147e61ddff <4fcaad2b7dac3f16704f8118c7e481024ddbd3ed; version=a1b0e4e684e9c300b9e759b46cb7a0147e61ddff <b1523e4ba293b2a32d9fabaf70c1dcaa6e3e2847; version=a1b0e4e684e9c300b9e759b46cb7a0147e61ddff <bbd6f0a948139970f4a615dff189d9a503681a39; version=a1b0e4e684e9c300b9e759b46cb7a0147e61ddff <e187ef83c04a5d23e68d39cfdff1a1931e29890c; version=aecbbae850ede49183fa0b73c7445531a47669cf; version=d2d055a554036b0240f296743942b8111fd4ce97

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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