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CVE Record

CVE-2024-36931: s390/cio: Ensure the copied buf is NUL terminated

In the Linux kernel, the following vulnerability has been resolved: s390/cio: Ensure the copied buf is NUL terminated Currently, we allocate a lbuf-sized kernel buffer and copy lbuf from userspace to that buffer. Later, we use scanf on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using scanf. Fix this issue by using memdup_user_nul instead.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2024-36931 is a Linux kernel bug in IBM s390 channel I/O handling. A user-supplied buffer could be copied without guaranteed string termination, letting later parsing read beyond the intended buffer. Sources do not provide a CVSS score, impact rating, or confirmed exploitation.

Executive priority

Treat as platform-specific maintenance unless your environment runs Linux on s390. There is no sourced evidence of exploitation or a rated business-critical impact, but kernel fixes should be included in normal patch cycles.

Technical view

In s390/cio, the kernel allocated an lbuf-sized buffer, copied lbuf bytes from userspace, then used scanf-style parsing without ensuring a NUL terminator inside the buffer. The resolved fix uses memdup_user_nul to ensure termination and prevent out-of-bounds read during parsing.

Likely exposure

Exposure appears limited to Linux systems running affected s390 architecture kernel code paths. Organizations without IBM Z or Linux on s390 are unlikely to be exposed based on the provided sources.

Exploitation context

The source bundle does not identify active exploitation, public exploit availability, privilege requirements, reachable interfaces, or practical impact beyond possible out-of-bounds read. CISA KEV status is false.

Researcher notes

Evidence is limited to the CVE record and upstream stable commits. The vulnerable pattern is an unterminated userspace-copied buffer consumed by scanf, causing potential OOB read. The bundle does not document crashability, information disclosure scope, or triggering prerequisites.

Mitigation direction

  • Check vendor kernel advisories for your distribution and s390 platform.
  • Upgrade to a kernel containing the referenced stable fixes.
  • Prioritize IBM Z or s390 Linux hosts in asset review.
  • Track distribution backports, because fixed package versions may differ from upstream versions.

Validation and detection

  • Inventory Linux kernel versions on s390 systems.
  • Confirm whether deployed kernels include one of the referenced stable commits.
  • Review distribution security advisories for CVE-2024-36931 backport status.
  • Verify no exposed s390/cio operational dependency is delaying kernel updates.
Prepared
Confidence
medium
Sources
7

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

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CVE-2024-36931 mapping review

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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
6Source 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
LinuxLinuxa4f17cc726712a52122ad38540bc3ff3a052d1a4, a4f17cc726712a52122ad38540bc3ff3a052d1a4, a4f17cc726712a52122ad38540bc3ff3a052d1a4, a4f17cc726712a52122ad38540bc3ff3a052d1a4, a4f17cc726712a52122ad38540bc3ff3a052d1a4unaffected
LinuxLinux5.13, 0, 5.15.159, 6.1.91, 6.6.31, 6.8.10, 6.9affected
Weakness

CWE details

No CWE listed

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