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CVE Record

CVE-2024-50143: udf: fix uninit-value use in udf_get_fileshortad

In the Linux kernel, the following vulnerability has been resolved: udf: fix uninit-value use in udf_get_fileshortad Check for overflow when computing alen in udf_current_aext to mitigate later uninit-value use in udf_get_fileshortad KMSAN bug[1]. After applying the patch reproducer did not trigger any issue[2]. [1] https://syzkaller.appspot.com/bug?extid=8901c4560b7ab5c2f9df [2] https://syzkaller.appspot.com/x/log.txt?x=10242227980000

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in Linux UDF filesystem handling can use uninitialized data after an overflow calculation. Exploitation requires local access and user interaction, but the assigned CVSS score indicates potentially serious confidentiality, integrity, and availability impact. The public evidence shows a syzkaller-discovered kernel bug, not attacks in the wild.

Executive priority

Treat this as a high-severity patching item, especially for shared systems or environments processing untrusted media. It does not currently justify an exploitation-driven emergency response because the supplied sources show no active attacks. Require owners to establish exposure, apply supported kernel updates, and verify the running kernel within the normal high-severity remediation window.

Technical view

An overflow while calculating alen in udf_current_aext can lead udf_get_fileshortad to consume an uninitialized value. The upstream fix adds overflow checking, and the cited reproducer stopped triggering the KMSAN finding after patching. The supplied record assigns CVSS 3.1 score 7.8 and CWE-908.

Likely exposure

Exposure is most plausible on affected Linux systems that process UDF filesystems, including systems where users can interact with relevant media or images. The CVSS vector is local, requires user interaction, and requires no privileges. Exact exposure depends on the running kernel, distribution backports, and whether UDF processing is reachable.

Exploitation context

The supplied record is not in KEV and provides no evidence of active exploitation. Public evidence documents automated syzkaller discovery and a reproducer used to confirm the fix. Although CVSS estimates high potential impact, the bundle does not establish demonstrated compromise, reliable exploitation, or specific real-world outcomes.

Researcher notes

The affected-version data mixes kernel versions with repeated commit identifiers, so it should not be interpreted as a complete distribution-level boundary. Multiple stable-branch commits are cited. The bundle confirms an overflow check prevents the KMSAN reproducer, but it does not document exploit reliability, attacker-controlled effects, or concrete post-trigger behavior.

Mitigation direction

  • Upgrade to a vendor-supported kernel package containing the applicable upstream stable fix.
  • Check distribution guidance because package versions and backported fixes may differ from upstream kernel versions.
  • Prioritize systems that permit users to process UDF media or filesystem images.
  • Apply temporary access restrictions around untrusted UDF content where patching must be delayed.
  • Reboot after upgrading and confirm the patched kernel is actually running.

Validation and detection

  • Inventory running kernel and distribution package versions across Linux systems.
  • Compare each package against vendor advisories and documented backports for CVE-2024-50143.
  • Identify systems where UDF filesystem processing is enabled or operationally reachable.
  • Confirm the running kernel contains the applicable stable fix, not merely an installed update.
  • Use controlled regression testing or vendor validation to confirm remediation without exposing production systems.
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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cwe · low confidence lookup

CWE-908: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2024-50143 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

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

2CVSS vectors
3Timeline events
2ADP providers
10Source links

SSVC decision data

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

CVSS vector scores

2 official scores

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
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Linux
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-50143Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2unaffected
LinuxLinux2.6.12, 0, 4.19.323, 5.4.285, 5.10.246, 5.15.170, 6.1.115, 6.6.59, 6.11.6, 6.12affected
Weakness

CWE details

CWE-908

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

CWE-908 · source CWE mapping

Use of Uninitialized Resource

Use of Uninitialized Resource represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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