CVE-2026-23242Network attack vector

Remote kernel crash via NULL header context

Published Mar 18, 2026 · Updated Mar 18, 2026

NULL pointer dereference in the Linux Kernel allows remote attackers to crash affected systems through malformed Soft-iWARP headers. When siw_get_hdr() rejects a header before set_rx_fpdu_context() initializes qp->rx_fpdu, siw_tcp_rx_data() follows its error path and reads more_ddp_segs through the NULL pointer. The Soft-iWARP RDMA driver must be enabled and network-reachable; the reported consequence is a kernel crash without data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.45%
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 Linux Kernel allows remote attackers to crash affected systems through malformed Soft-iWARP headers. When siw_get_hdr() rejects a header before set_rx_fpdu_context() initializes qp->rx_fpdu, siw_tcp_rx_data() follows its error path and reads more_ddp_segs through the NULL pointer. The Soft-iWARP RDMA driver must be enabled and network-reachable; the reported consequence is a kernel crash without data disclosure or modification.

The record

CVE
CVE-2026-23242
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 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=5.3
  2. Affected versionversion=8b6a361b8c482f22ac99c3273285ff16b23fba91 <14ab3da122bd18920ad57428f6cf4fade8385142
  3. Affected versionversion=8b6a361b8c482f22ac99c3273285ff16b23fba91 <714c99e1dc8f85f446e05be02ba83972e981a817
  4. Affected versionversion=8b6a361b8c482f22ac99c3273285ff16b23fba91 <8564dcc12fbb372d984ab45768cae9335777b274
  5. Affected versionversion=8b6a361b8c482f22ac99c3273285ff16b23fba91 <87b7a036d2c73d5bb3ae2d47dee23de465db3355
  6. Affected versionversion=8b6a361b8c482f22ac99c3273285ff16b23fba91 <ab61841633d10e56a58c1493a262f0d02dba2f5e
  7. Affected versionversion=8b6a361b8c482f22ac99c3273285ff16b23fba91 <ab957056192d6bd068b3759cb2077d859cca01f0
  8. Affected versionversion=8b6a361b8c482f22ac99c3273285ff16b23fba91 <ce025f7f5d070596194315eb2e4e89d568b8a755
  9. Affected versionversion=8b6a361b8c482f22ac99c3273285ff16b23fba91 <ffba40b67663567481fa8a1ed5d2da36897c175d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.3; version=8b6a361b8c482f22ac99c3273285ff16b23fba91 <14ab3da122bd18920ad57428f6cf4fade8385142; version=8b6a361b8c482f22ac99c3273285ff16b23fba91 <714c99e1dc8f85f446e05be02ba83972e981a817; version=8b6a361b8c482f22ac99c3273285ff16b23fba91 <8564dcc12fbb372d984ab45768cae9335777b274; version=8b6a361b8c482f22ac99c3273285ff16b23fba91 <87b7a036d2c73d5bb3ae2d47dee23de465db3355; version=8b6a361b8c482f22ac99c3273285ff16b23fba91 <ab61841633d10e56a58c1493a262f0d02dba2f5e; version=8b6a361b8c482f22ac99c3273285ff16b23fba91 <ab957056192d6bd068b3759cb2077d859cca01f0; version=8b6a361b8c482f22ac99c3273285ff16b23fba91 <ce025f7f5d070596194315eb2e4e89d568b8a755; version=8b6a361b8c482f22ac99c3273285ff16b23fba91 <ffba40b67663567481fa8a1ed5d2da36897c175d

Published CVSS scores

7.5LinuxCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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