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CVE Record

CVE-2023-53269: block: ublk: make sure that block size is set correctly

In the Linux kernel, the following vulnerability has been resolved: block: ublk: make sure that block size is set correctly block size is one very key setting for block layer, and bad block size could panic kernel easily. Make sure that block size is set correctly. Meantime if ublk_validate_params() fails, clear ub->params so that disk is prevented from being added.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can let a local, low-privileged user trigger a kernel panic through incorrect ublk block-size handling. The main business impact is availability: affected systems could crash, causing service interruption. The bundle does not show data theft, privilege escalation, or confirmed real-world exploitation.

Executive priority

Treat as a moderate availability risk. Patch during normal vulnerability remediation, faster for shared Linux hosts, multi-tenant environments, or systems where a local crash would disrupt critical services.

Technical view

The flaw is in the Linux kernel ublk block driver parameter validation. A bad block size could reach the block layer and panic the kernel. The fix enforces correct block size handling and clears ublk parameters when validation fails, preventing the disk from being added with invalid settings.

Likely exposure

Exposure is limited to Linux systems running affected kernel versions where local users or workloads can interact with ublk functionality. Network-only exposure is not indicated by the CVSS vector or source bundle.

Exploitation context

The CVSS vector is local, low complexity, low privileges, no user interaction, with high availability impact only. The CVE is not marked KEV, and the provided sources do not claim active exploitation.

Researcher notes

The source bundle provides fix intent and CVSS impact, but limited downstream version mapping. Affected-version entries appear sparse and duplicated, so confirm exposure using vendor advisories and kernel package metadata before declaring systems vulnerable or fixed.

Mitigation direction

  • Upgrade to a vendor kernel containing the referenced ublk validation fixes.
  • Prioritize systems where local untrusted users or containers can access block-device functionality.
  • If immediate patching is impossible, check vendor guidance for supported temporary mitigations.
  • Review kernel and distribution advisories for exact fixed package versions.

Validation and detection

  • Inventory Linux kernel versions against the CVE affected-version data.
  • Confirm patched kernels include the referenced stable ublk fixes or vendor backports.
  • Identify whether ublk is enabled or used on exposed systems.
  • After patching, verify affected workloads still initialize storage devices correctly.
Prepared
Confidence
medium
Sources
5

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-2023-53269 mapping review

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

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

1CVSS vectors
3Timeline events
1ADP providers
4Source links

SSVC decision data

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

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2023-53269Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux71f28f3136aff5890cd56de78abc673f8393cad9, 71f28f3136aff5890cd56de78abc673f8393cad9, 71f28f3136aff5890cd56de78abc673f8393cad9unaffected
LinuxLinux6.0, 0, 6.1.24, 6.2.11, 6.3affected
Weakness

CWE details

No CWE listed

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