CVE-2022-49429

Kernel panic via disabled-SDMA NULL pointer dereference

Published Feb 26, 2025 · Updated May 11, 2026

NULL pointer dereference in the Linux kernel's hfi1 driver allows local users to panic affected systems through a write request. hfi1_write_iter() passes the request into user SDMA processing without first checking whether the module disabled SDMA, causing sdma_select_user_engine() to dereference an unavailable engine pointer. The path requires the hfi1 module to be loaded with HFI1_CAP_SDMA off and access to its user write interface; the consequence is a host crash.

CVSS severity5.5
Medium
EPSS probability0.26%
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 hfi1 driver allows local users to panic affected systems through a write request. hfi1_write_iter() passes the request into user SDMA processing without first checking whether the module disabled SDMA, causing sdma_select_user_engine() to dereference an unavailable engine pointer. The path requires the hfi1 module to be loaded with HFI1_CAP_SDMA off and access to its user write interface; the consequence is a host crash.

The record

CVE
CVE-2022-49429
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=0cb2aa690c7ef14ad1f544288349abb5434bb75d <0e4dda8b3f4c07ee9ea670a10ea3171a5e63a86f
  2. Affected versionversion=0cb2aa690c7ef14ad1f544288349abb5434bb75d <22e7e400fd1a890db2ea13686324aff50e972f4f
  3. Affected versionversion=0cb2aa690c7ef14ad1f544288349abb5434bb75d <29952ab85d6c3fe0b7909d9a737f10c58bf6824d
  4. Affected versionversion=0cb2aa690c7ef14ad1f544288349abb5434bb75d <32e6aea33944f364d51cd263e4cd236393a188b6
  5. Affected versionversion=0cb2aa690c7ef14ad1f544288349abb5434bb75d <33794e8e9bcb4affc0ebff9cdec85acc8b8a1762
  6. Affected versionversion=0cb2aa690c7ef14ad1f544288349abb5434bb75d <629e052d0c98e46dde9f0824f0aa437f678d9b8f
  7. Affected versionversion=0cb2aa690c7ef14ad1f544288349abb5434bb75d <cc80d3c37cec9d6ddb140483647901bc7cc6c31d
  8. Affected versionversion=0cb2aa690c7ef14ad1f544288349abb5434bb75d <e60ad83f645ee6fadd5a8057ba267aeec54f08fe
  9. Affected versionversion=4.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0cb2aa690c7ef14ad1f544288349abb5434bb75d <0e4dda8b3f4c07ee9ea670a10ea3171a5e63a86f; version=0cb2aa690c7ef14ad1f544288349abb5434bb75d <22e7e400fd1a890db2ea13686324aff50e972f4f; version=0cb2aa690c7ef14ad1f544288349abb5434bb75d <29952ab85d6c3fe0b7909d9a737f10c58bf6824d; version=0cb2aa690c7ef14ad1f544288349abb5434bb75d <32e6aea33944f364d51cd263e4cd236393a188b6; version=0cb2aa690c7ef14ad1f544288349abb5434bb75d <33794e8e9bcb4affc0ebff9cdec85acc8b8a1762; version=0cb2aa690c7ef14ad1f544288349abb5434bb75d <629e052d0c98e46dde9f0824f0aa437f678d9b8f; version=0cb2aa690c7ef14ad1f544288349abb5434bb75d <cc80d3c37cec9d6ddb140483647901bc7cc6c31d; version=0cb2aa690c7ef14ad1f544288349abb5434bb75d <e60ad83f645ee6fadd5a8057ba267aeec54f08fe; version=4.9

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

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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.

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Technologies

Your stack

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Your stack

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