CVE-2026-46127

Kernel crash via NULL uctx error cleanup

Published May 28, 2026 · Updated May 28, 2026

NULL pointer dereference in the Linux kernel's ocrdma driver allows local users to crash the kernel through a protection-domain error path. In ocrdma_copy_pd_uresp, two failure branches pass pd->uctx to ocrdma_del_mmap before that field is initialized instead of using the valid local uctx. Exploitation requires low-privilege local access, the ocrdma driver, and a response-copy failure during protection-domain allocation; the documented consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.13%
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's ocrdma driver allows local users to crash the kernel through a protection-domain error path. In ocrdma_copy_pd_uresp, two failure branches pass pd->uctx to ocrdma_del_mmap before that field is initialized instead of using the valid local uctx. Exploitation requires low-privilege local access, the ocrdma driver, and a response-copy failure during protection-domain allocation; the documented consequence is a kernel crash.

The record

CVE
CVE-2026-46127
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=3.5
  2. Affected versionversion=fe2caefcdf5869f308c102e3d64d40683bfad711 <34fbf48cf3b410d2a6e8c586fa952a36331ca5ba
  3. Affected versionversion=fe2caefcdf5869f308c102e3d64d40683bfad711 <75fc130664ae324e7b2f9ad3630e0f175e9ca6c8
  4. Affected versionversion=fe2caefcdf5869f308c102e3d64d40683bfad711 <8832626a483439e207734e027afff322ccdf726e
  5. Affected versionversion=fe2caefcdf5869f308c102e3d64d40683bfad711 <e01a957561f663d3b68d2fd233a4502e3367efcd
  6. Affected versionversion=fe2caefcdf5869f308c102e3d64d40683bfad711 <ec44c00a4fe1327efa35083f98b39c01cb535a51

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.5; version=fe2caefcdf5869f308c102e3d64d40683bfad711 <34fbf48cf3b410d2a6e8c586fa952a36331ca5ba; version=fe2caefcdf5869f308c102e3d64d40683bfad711 <75fc130664ae324e7b2f9ad3630e0f175e9ca6c8; version=fe2caefcdf5869f308c102e3d64d40683bfad711 <8832626a483439e207734e027afff322ccdf726e; version=fe2caefcdf5869f308c102e3d64d40683bfad711 <e01a957561f663d3b68d2fd233a4502e3367efcd; version=fe2caefcdf5869f308c102e3d64d40683bfad711 <ec44c00a4fe1327efa35083f98b39c01cb535a51

Published CVSS scores

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.

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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
T1499.004Application or System Exploitation

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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