Security readout for executives and security teams
Plain-English summary
A missing index check in Linux’s DVB media subsystem could let a locally authenticated, low-privilege user reference an invalid video buffer. The supplied CVSS assessment indicates potential compromise of confidentiality, integrity, and availability. This is important on Linux systems exposing DVB functionality to untrusted local users or workloads.
Executive priority
Prioritize affected multi-user, shared-hosting, desktop, and media-processing systems exposing DVB devices. Treat internet-only servers without DVB access as lower urgency after validation. Remediate during the next expedited kernel maintenance window; accelerate where untrusted local users or workloads can reach the device interface.
Technical view
CVE-2024-50291 is a CWE-129 improper array-index validation issue in dvb_vb2_expbuf(). The function failed to verify that a requested buffer index referred to a valid buffer. The Linux stable commits add the missing check. CVSS 3.1 rates it 7.8: local access, low complexity, low privileges, no user interaction, and high potential impact.
Likely exposure
Exposure is limited to affected Linux kernels where DVB buffer-export functionality is reachable by a low-privilege local user. The supplied record names 6.8, 6.11.8, and 6.12, but its version notation includes an ambiguous “0” entry. Confirm exact affected and fixed builds with the kernel or distribution vendor.
Exploitation context
The supplied CVSS vector describes local, low-privilege exploitation without user interaction; it is not remotely exploitable under that assessment. The record is not in KEV, and the supplied sources provide no evidence of active exploitation or a public exploit. Practical reachability depends on DVB device availability and local access controls.
Researcher notes
The root cause is missing bounds validation before buffer export in dvb_vb2_expbuf(). The two Linux stable references are the authoritative supplied fix artifacts. Source evidence does not establish the precise failure mode beyond invalid-index handling, exploit reliability, affected architecture constraints, or whether downstream distributions backported the correction under different commit identifiers.
Mitigation direction
- Install a vendor-supported kernel containing the referenced stable fix or its distribution backport.
- Confirm the installed package’s changelog maps its backport to CVE-2024-50291.
- Restrict untrusted users and workloads from accessing DVB devices until remediation is complete.
- Check Linux distribution guidance where the supplied version boundaries are ambiguous.
Validation and detection
- Inventory running kernel versions on systems providing or attaching DVB devices.
- Identify whether low-privilege users or containers can access relevant DVB device interfaces.
- Verify the installed kernel includes either referenced fix or a documented equivalent backport.
- Review vendor advisories and package metadata for precise affected-version status.
- After updating, confirm systems booted into the remediated kernel.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
CWE-129: Exact CWE lookup
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Open ATT&CK lookupCVE-2024-50291 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- 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
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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N1.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/721c37af0355cc0b540909c57fd7930dc99c72d8CVE reference, Linux
- https://git.kernel.org/stable/c/fa88dc7db176c79b50adb132a56120a1d4d9d18bCVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Validation of Array Index
Improper Validation of Array Index represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.