CVE-2024-46686

Kernel crash via NULL RDMA read context

Published Sep 13, 2024 · Updated May 23, 2026

NULL-pointer dereference in the Linux SMB client allows local users to crash the kernel through an SMB Direct read over RDMA. smb2_new_read_req() dereferences a NULL rdata pointer when SMB2_read() crosses the RDMA read/write threshold without initializing the scatter-gather context. Reachability requires a locally initiated SMB Direct mount with RDMA support and a read at the configured threshold; triggering the path interrupts the host by crashing the kernel.

CVSS severity5.5
Medium
EPSS probability0.23%
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 SMB client allows local users to crash the kernel through an SMB Direct read over RDMA. smb2_new_read_req() dereferences a NULL rdata pointer when SMB2_read() crosses the RDMA read/write threshold without initializing the scatter-gather context. Reachability requires a locally initiated SMB Direct mount with RDMA support and a read at the configured threshold; triggering the path interrupts the host by crashing the kernel.

The record

CVE
CVE-2024-46686
Published
Sep 13, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 13, 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

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=6.1.16 <6.1.108
  2. Affected versionversion=6.2.3 <6.3
  3. Affected versionversion=6.3
  4. Affected versionversion=74ab77137c99438626f4eb8134d8e26204bb5b64
  5. Affected versionversion=a6559cc1d35d3eeafb0296aca347b2f745a28a74 <a01859dd6aebf826576513850a3b05992809e9d2
  6. Affected versionversion=a6559cc1d35d3eeafb0296aca347b2f745a28a74 <b902fb78ab21299e4dd1775e7e8d251d5c0735bc
  7. Affected versionversion=a6559cc1d35d3eeafb0296aca347b2f745a28a74 <c724b2ab6a46435b4e7d58ad2fbbdb7a318823cf
  8. Affected versionversion=edf38e9f4269591d26b3783c0b348c9345580c3c <6df57c63c200cd05e085c3b695128260e21959b7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1.16 <6.1.108; version=6.2.3 <6.3; version=6.3; version=74ab77137c99438626f4eb8134d8e26204bb5b64; version=a6559cc1d35d3eeafb0296aca347b2f745a28a74 <a01859dd6aebf826576513850a3b05992809e9d2; version=a6559cc1d35d3eeafb0296aca347b2f745a28a74 <b902fb78ab21299e4dd1775e7e8d251d5c0735bc; version=a6559cc1d35d3eeafb0296aca347b2f745a28a74 <c724b2ab6a46435b4e7d58ad2fbbdb7a318823cf; version=edf38e9f4269591d26b3783c0b348c9345580c3c <6df57c63c200cd05e085c3b695128260e21959b7

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.

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)
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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