Security readout for executives and security teams
Plain-English summary
This is a Linux kernel availability flaw in Bluetooth HCI UART handling. A local user can potentially trigger a kernel NULL pointer dereference when initialization failure is mishandled, causing service disruption. The sources do not indicate data theft, privilege escalation, or active exploitation.
Executive priority
Treat as a routine but real kernel availability issue. It is not presented as remotely exploitable or actively exploited, but affected multi-user or operational Linux systems should receive normal kernel patch priority.
Technical view
The kernel Bluetooth hci_ldisc and hci_serdev paths ignored percpu_init_rwsem() failures. Later close, register, or unregister flows could call synchronization cleanup paths without successful initialization, producing a NULL pointer dereference. CVSS 3.1 is 5.5: local attack, low complexity, low privileges, no user interaction, high availability impact only.
Likely exposure
Exposure is most relevant to Linux systems using affected kernels with Bluetooth HCI UART or serdev support available. Systems without Bluetooth support or without the affected kernel code path are less likely exposed, but confirmation requires kernel configuration and package-level review.
Exploitation context
CISA KEV is false in the supplied bundle, and no cited source claims active exploitation. The CVSS vector requires local access with low privileges and targets availability, not confidentiality or integrity.
Researcher notes
The vulnerability is rooted in missing error handling for percpu_init_rwsem() in Bluetooth HCI UART code. Evidence supports denial of service through NULL dereference only. Affected version metadata in the bundle is limited, so package-level validation is necessary.
Mitigation direction
- Apply a vendor-supported kernel update containing the referenced stable fixes.
- Check Linux distribution advisories for fixed package versions before rollout.
- Prioritize shared systems where local users can access Bluetooth-related interfaces.
- Disable or restrict unnecessary Bluetooth functionality where operationally acceptable.
- Plan reboot or live-patch procedures according to normal kernel update policy.
Validation and detection
- Inventory running Linux kernel versions against the affected versions in the CVE record.
- Confirm whether kernel packages include the referenced stable commits.
- Review kernel configuration for Bluetooth HCI UART and serdev support.
- Check distribution security trackers for this CVE and package status.
- Monitor for kernel NULL pointer dereference reports in Bluetooth HCI UART paths.
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
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ATT&CK lookup starting points
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CWE-908: Exact CWE lookup
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Open ATT&CK lookupCVE-2022-50374 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
- 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
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.
CVSS vector scores
1 official scoreWe 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:N/I:N/A:H1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/d7cc0d51ffcbfd1caaa809fcf9cff05c46d0fb4dCVE reference
- https://git.kernel.org/stable/c/b8917dce2134739b39bc0a5648b18427f2cad569CVE reference
- https://git.kernel.org/stable/c/75b2c71ea581c7bb1303860d89366a42ad0506d2CVE reference
- https://git.kernel.org/stable/c/98ce10f3f345e61fc6c83bff9cd11cda252b05acCVE reference
- https://git.kernel.org/stable/c/3124d320c22f3f4388d9ac5c8f37eaad0cefd6b1CVE reference
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.
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.