LiveActive security incident?Get immediate response
CVE Record

CVE-2022-48750: hwmon: (nct6775) Fix crash in clear_caseopen

In the Linux kernel, the following vulnerability has been resolved: hwmon: (nct6775) Fix crash in clear_caseopen Paweł Marciniak reports the following crash, observed when clearing the chassis intrusion alarm. BUG: kernel NULL pointer dereference, address: 0000000000000028 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 3 PID: 4815 Comm: bash Tainted: G S 5.16.2-200.fc35.x86_64 #1 Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Z97 Extreme4, BIOS P2.60A 05/03/2018 RIP: 0010:clear_caseopen+0x5a/0x120 [nct6775] Code: 68 70 e8 e9 32 b1 e3 85 c0 0f 85 d2 00 00 00 48 83 7c 24 ... RSP: 0018:ffffabcb02803dd8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000 RDX: ffff8e8808192880 RSI: 0000000000000000 RDI: ffff8e87c7509a68 RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000000000a R10: 000000000000000a R11: f000000000000000 R12: 000000000000001f R13: ffff8e87c7509828 R14: ffff8e87c7509a68 R15: ffff8e88494527a0 FS: 00007f4db9151740(0000) GS:ffff8e8ebfec0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000028 CR3: 0000000166b66001 CR4: 00000000001706e0 Call Trace: <TASK> kernfs_fop_write_iter+0x11c/0x1b0 new_sync_write+0x10b/0x180 vfs_write+0x209/0x2a0 ksys_write+0x4f/0xc0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae The problem is that the device passed to clear_caseopen() is the hwmon device, not the platform device, and the platform data is not set in the hwmon device. Store the pointer to sio_data in struct nct6775_data and get if from there if needed.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can crash a system path used by the nct6775 hardware monitoring driver when clearing a chassis intrusion alarm. It is not described as remote code execution, and the provided sources do not show active exploitation. Exposure appears limited to Linux systems using this driver and affected kernel versions.

Executive priority

Treat this as a targeted stability issue, not an emergency internet-facing compromise. Patch during normal kernel maintenance, with higher priority for systems where hardware monitoring workflows are operationally important.

Technical view

The crash is a NULL pointer dereference in clear_caseopen() in the hwmon nct6775 driver. The function received the hwmon device rather than the platform device, so expected platform data was missing. The fix stores the sio_data pointer in struct nct6775_data and retrieves it from there when needed.

Likely exposure

Likely exposed systems are Linux hosts running affected 5.16-era kernels with nct6775-supported hardware monitoring enabled. The source bundle identifies Linux as affected and references stable kernel fixes, but does not provide distribution-specific package status or a complete hardware inventory condition.

Exploitation context

No provided source reports exploitation, and the KEV flag is false. The reported crash occurred while clearing the chassis intrusion alarm through the kernel hwmon path. The bundle supports local crash risk, not remote compromise or privilege escalation.

Researcher notes

The evidence is concise: a kernel crash report, root cause, and stable commit references. CVSS and CWE data are absent, and distribution impact is not included. Avoid assuming broader exploitability beyond the documented NULL dereference crash path.

Mitigation direction

  • Apply vendor or distribution kernel updates containing the referenced nct6775 fixes.
  • Prioritize systems using affected 5.16-era kernels and nct6775 hardware monitoring.
  • Check Linux vendor advisories for exact fixed package versions.
  • Restrict operational access to chassis-intrusion clearing workflows to trusted administrators.

Validation and detection

  • Inventory kernel versions and identify systems in the affected 5.16-era range.
  • Confirm whether the nct6775 driver is present or loaded on candidate systems.
  • Verify vendor kernel changelogs include the referenced nct6775 clear_caseopen fix.
  • Review monitoring or crash logs for kernel oops events mentioning clear_caseopen or nct6775.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2022-48750 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
3Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux2e7b9886968b89f0b4cbc59b8e6ed47fd4edd0dd, 2e7b9886968b89f0b4cbc59b8e6ed47fd4edd0ddunaffected
LinuxLinux5.16, 0, 5.16.5, 5.17affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.