CVE-2025-21885Network attack vector

Kernel panic via uninitialized SRQ page geometry

Published Mar 27, 2025 · Updated Aug 5, 2026

Denial of service in Linux allows remote attackers to trigger a kernel panic through an NVMe-over-RDMA connection using shared receive queues. bnxt_re_create_srq initializes page size and shift only for user-space SRQs, leaving kernel-consumer page geometry unset before bnxt_qplib_alloc_init_hwq performs its allocation calculation. Reachability requires a bnxt_re RDMA device and an NVMe target configured with use_srq; the resulting divide error crashes the kernel without reported data exposure or modification.

CVSS severity7.5
High
EPSS probability0.43%
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 Linux allows remote attackers to trigger a kernel panic through an NVMe-over-RDMA connection using shared receive queues. bnxt_re_create_srq initializes page size and shift only for user-space SRQs, leaving kernel-consumer page geometry unset before bnxt_qplib_alloc_init_hwq performs its allocation calculation. Reachability requires a bnxt_re RDMA device and an NVMe target configured with use_srq; the resulting divide error crashes the kernel without reported data exposure or modification.

The record

CVE
CVE-2025-21885
Published
Mar 27, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=0c4dcd602817502bb3dced7a834a13ef717d65a4 <2cf8e6b52aecb8fbb71c41fe5add3212814031a2
  2. Affected versionversion=0c4dcd602817502bb3dced7a834a13ef717d65a4 <722c3db62bf60cd23acbdc8c4f445bfedae4498e
  3. Affected versionversion=0c4dcd602817502bb3dced7a834a13ef717d65a4 <b66535356a4834a234f99e16a97eb51f2c6c5a7d
  4. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0c4dcd602817502bb3dced7a834a13ef717d65a4 <2cf8e6b52aecb8fbb71c41fe5add3212814031a2; version=0c4dcd602817502bb3dced7a834a13ef717d65a4 <722c3db62bf60cd23acbdc8c4f445bfedae4498e; version=0c4dcd602817502bb3dced7a834a13ef717d65a4 <b66535356a4834a234f99e16a97eb51f2c6c5a7d; version=5.7

Published CVSS scores

7.5kernel.org CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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