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CVE Record

CVE-2024-27043: media: edia: dvbdev: fix a use-after-free

In the Linux kernel, the following vulnerability has been resolved: media: edia: dvbdev: fix a use-after-free In dvb_register_device, *pdvbdev is set equal to dvbdev, which is freed in several error-handling paths. However, *pdvbdev is not set to NULL after dvbdev's deallocation, causing use-after-frees in many places, for example, in the following call chain: budget_register |-> dvb_dmxdev_init |-> dvb_register_device |-> dvb_dmxdev_release |-> dvb_unregister_device |-> dvb_remove_device |-> dvb_device_put |-> kref_put When calling dvb_unregister_device, dmxdev->dvbdev (i.e. *pdvbdev in dvb_register_device) could point to memory that had been freed in dvb_register_device. Thereafter, this pointer is transferred to kref_put and triggering a use-after-free.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux kernel flaw can leave a freed Digital Video Broadcasting device object accessible during error cleanup. A local, low-privileged user could potentially trigger memory corruption, threatening confidentiality, integrity, and availability. Exposure depends on the installed kernel, relevant DVB functionality, and vendor backports.

Executive priority

Treat this as a high-priority kernel maintenance issue, especially on shared or otherwise locally accessible Linux hosts using DVB functionality. It is less urgent than an unauthenticated remote flaw because local access is required and active exploitation is not evidenced. Use vendor package status, not upstream version numbers alone, to schedule remediation.

Technical view

dvb_register_device can assign *pdvbdev before freeing dvbdev on an error path without clearing the caller’s pointer. Later cleanup can pass this stale pointer through dvb_unregister_device, dvb_remove_device, dvb_device_put, and kref_put, causing a use-after-free. The supplied CVSS 3.1 score is 7.8 with local, low-privilege attack requirements.

Likely exposure

Systems running affected Linux kernel branches with relevant media/DVB functionality are the likely exposure population. The bundle lists affected releases across branches from 2.6.21 through 6.9, but does not provide enough normalized range data to determine every vulnerable build. Distribution backports may change status.

Exploitation context

The supplied CVSS vector describes local exploitation requiring low privileges, low complexity, and no user interaction. Successful exploitation could affect confidentiality, integrity, and availability. The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation or a public working exploit.

Researcher notes

The defect is a stale output pointer caused by incomplete error-path cleanup, culminating in kref_put operating on freed memory. Multiple stable-kernel commit references indicate branch-specific fixes. The bundle does not establish practical exploit reliability, affected configurations beyond DVB involvement, or precise distribution package boundaries.

Mitigation direction

  • Apply a vendor-supported kernel update containing the appropriate stable fix or backport.
  • Prioritize multi-user systems where untrusted local users can access relevant DVB functionality.
  • If updates are delayed, consult vendor guidance about safely disabling unused DVB functionality.
  • Reboot into the updated kernel and remove superseded vulnerable kernels where operationally appropriate.

Validation and detection

  • Inventory running kernel versions and installed kernel packages across Linux systems.
  • Determine whether DVB media drivers or associated hardware are present and operationally required.
  • Compare vendor advisories and package changelogs for CVE-2024-27043 backport confirmation.
  • Confirm the running kernel after remediation, including required reboots.
  • Regression-test DVB-dependent services after updating or disabling functionality.
Prepared
Confidence
high
Sources
6

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-2024-27043 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:L/UI:N/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.

1CVSS vectors
3Timeline events
2ADP providers
12Source 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
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-27043Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxb61901024776b25ce7b8edc31bb1757c7382a88e, b61901024776b25ce7b8edc31bb1757c7382a88e, b61901024776b25ce7b8edc31bb1757c7382a88e, b61901024776b25ce7b8edc31bb1757c7382a88e, b61901024776b25ce7b8edc31bb1757c7382a88e, b61901024776b25ce7b8edc31bb1757c7382a88e, b61901024776b25ce7b8edc31bb1757c7382a88e, b61901024776b25ce7b8edc31bb1757c7382a88e, b61901024776b25ce7b8edc31bb1757c7382a88eunaffected
LinuxLinux2.6.21, 0, 4.19.311, 5.4.273, 5.10.214, 5.15.153, 6.1.83, 6.6.23, 6.7.11, 6.8.2, 6.9affected
Weakness

CWE details

No CWE listed

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