CVE-2026-52941

Local system crash via SMC-D tracepoint NULL dereference

Published Jun 24, 2026 · Updated Jun 24, 2026

Denial of service in the Linux kernel allows local users to crash the system through an SMC-D socket send or receive operation. The smc_msg_event tracepoint dereferences conn->lnk->ibname even though conn->lnk is unset for SMC-D, so the first traced sendmsg or recvmsg reaches strlen through a NULL-derived address. Root must first enable the tracepoint; an unprivileged local user can then trigger the kernel crash on s390 with SMC-D or x86 with the loopback ISM device loaded.

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

Denial of service in the Linux kernel allows local users to crash the system through an SMC-D socket send or receive operation. The smc_msg_event tracepoint dereferences conn->lnk->ibname even though conn->lnk is unset for SMC-D, so the first traced sendmsg or recvmsg reaches strlen through a NULL-derived address. Root must first enable the tracepoint; an unprivileged local user can then trigger the kernel crash on s390 with SMC-D or x86 with the loopback ISM device loaded.

The record

CVE
CVE-2026-52941
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=5.16
  2. Affected versionversion=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <561cf66fa9b6c86dfe4e687d2d1aeaaa6739917f
  3. Affected versionversion=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <68200112534bb2acd1d7117dc2d5c124868d866d
  4. Affected versionversion=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <720c76b930c52cd58f50eb6b10569d03dccc7959
  5. Affected versionversion=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <7bf563badd37cb796df5477d2b78bb64148a1268
  6. Affected versionversion=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <b706d6d76a2a2793fe5ad0fbc2a75b6a460094ef
  7. Affected versionversion=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <d2ea0b8aef8746e147602eac87ca8538f4bc7e66

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.16; version=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <561cf66fa9b6c86dfe4e687d2d1aeaaa6739917f; version=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <68200112534bb2acd1d7117dc2d5c124868d866d; version=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <720c76b930c52cd58f50eb6b10569d03dccc7959; version=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <7bf563badd37cb796df5477d2b78bb64148a1268; version=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <b706d6d76a2a2793fe5ad0fbc2a75b6a460094ef; version=aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 <d2ea0b8aef8746e147602eac87ca8538f4bc7e66

Published CVSS scores

5.5NVDCVSS: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

CWE-476NULL Pointer Dereference
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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