CVE-2026-53177

System crash via closed-NIC recovery dereference

Published Jun 25, 2026 · Updated Jun 25, 2026

NULL pointer dereference in the bnxt_en driver in Linux Kernel allows local users to crash the system through PCIe error recovery. bnxt_io_error_detected() calls bnxt_disable_int_sync(), which maps completion rings through bp->bnapi after NIC close has freed that pointer. Reachability requires PCIe error recovery to run while the NIC is administratively closed; the dereference can interrupt the entire host.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the bnxt_en driver in Linux Kernel allows local users to crash the system through PCIe error recovery. bnxt_io_error_detected() calls bnxt_disable_int_sync(), which maps completion rings through bp->bnapi after NIC close has freed that pointer. Reachability requires PCIe error recovery to run while the NIC is administratively closed; the dereference can interrupt the entire host.

The record

CVE
CVE-2026-53177
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.17
  2. Affected versionversion=e5811b8c09df9bc80eabc95339fceded23f16289 <08e57d014ea19f303d5d57a849beb846f37788b7
  3. Affected versionversion=e5811b8c09df9bc80eabc95339fceded23f16289 <1a418ad0e5e525d1d117dd1601681f75455af320
  4. Affected versionversion=e5811b8c09df9bc80eabc95339fceded23f16289 <3884976f87448e269908ae61bd5d62d54ce9c0c7
  5. Affected versionversion=e5811b8c09df9bc80eabc95339fceded23f16289 <580844a9683afe7974856dd5b7886447435b3474
  6. Affected versionversion=e5811b8c09df9bc80eabc95339fceded23f16289 <59c5a3e69c7630a811565937e64be70b08436761
  7. Affected versionversion=e5811b8c09df9bc80eabc95339fceded23f16289 <964b1c3eb71afe58bb61c8b984164447e000ae8a
  8. Affected versionversion=e5811b8c09df9bc80eabc95339fceded23f16289 <d930276f2cddd0b7294cac7a8fe7b877f6d9e08d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.17; version=e5811b8c09df9bc80eabc95339fceded23f16289 <08e57d014ea19f303d5d57a849beb846f37788b7; version=e5811b8c09df9bc80eabc95339fceded23f16289 <1a418ad0e5e525d1d117dd1601681f75455af320; version=e5811b8c09df9bc80eabc95339fceded23f16289 <3884976f87448e269908ae61bd5d62d54ce9c0c7; version=e5811b8c09df9bc80eabc95339fceded23f16289 <580844a9683afe7974856dd5b7886447435b3474; version=e5811b8c09df9bc80eabc95339fceded23f16289 <59c5a3e69c7630a811565937e64be70b08436761; version=e5811b8c09df9bc80eabc95339fceded23f16289 <964b1c3eb71afe58bb61c8b984164447e000ae8a; version=e5811b8c09df9bc80eabc95339fceded23f16289 <d930276f2cddd0b7294cac7a8fe7b877f6d9e08d

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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