Security readout for executives and security teams
Plain-English summary
CVE-2022-48878 is a Linux kernel Bluetooth driver flaw affecting the Qualcomm Atheros hci_qca shutdown path. On some systems, reboot can trigger a use-after-free when the driver talks to a serial device that is not open. The clearest business risk is device instability or reboot failure on affected Linux systems with this Bluetooth hardware.
Executive priority
Treat this as a targeted stability and safety issue rather than a broad internet-exposed emergency. Patch affected Linux fleets through normal kernel maintenance, with higher priority for embedded or operational devices where reboot reliability matters.
Technical view
The hci_qca serdev shutdown callback could send EDL_SOC_RESET when the HCI device was not open, leaving serdev and its TTY closed. Kernel reports show a use-after-free in tty_driver_flush_buffer during reboot on Qualcomm Robotics RB5 hardware. Stable kernel commits add checks to skip shutdown when the device is closed or powered off.
Likely exposure
Exposure appears limited to Linux systems using the Qualcomm Atheros Bluetooth hci_qca serdev driver. The source lists Linux as affected and includes versions around 5.8, 5.10.165, 5.15.90, 6.1.8, and 6.2, but distro-specific package exposure must be verified against vendor kernel advisories.
Exploitation context
The supplied sources do not show active exploitation, and KEV is false. The observed trigger is system reboot or shutdown on affected hardware after an HCI open failure or powered-off device state. No remote attack path, privilege boundary impact, or weaponized exploit is established in the provided evidence.
Researcher notes
Evidence is strong for the root cause and fix direction because kernel traces and stable commits are provided. Evidence is incomplete for exploitability, CVSS severity, distro package ranges, and impact beyond reboot-time memory safety on affected Qualcomm Atheros Bluetooth configurations.
Mitigation direction
- Update to a vendor kernel containing the referenced stable hci_qca fixes.
- Prioritize affected embedded, robotics, and appliance Linux devices using Qualcomm Atheros Bluetooth.
- Check distribution advisories for exact fixed package versions.
- If patching is delayed, assess whether affected Bluetooth hardware or driver use can be reduced.
- Monitor reboot stability after kernel updates on representative hardware.
Validation and detection
- Inventory Linux assets for Qualcomm Atheros Bluetooth using the hci_qca driver.
- Map running kernel versions to vendor advisories and stable fix commits.
- Review shutdown or reboot logs for hci_qca, serdev, TTY, or KASAN use-after-free traces.
- Confirm patched systems no longer show the described reboot-time driver fault.
- Track exceptions where embedded vendors ship custom or backported kernels.
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.
CVE-2022-48878 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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
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/e84ec6e25df9bb0968599e92eacedaf3a0a5b587CVE reference, Linux
- https://git.kernel.org/stable/c/908d1742b6e694e84ead5c62e4b7c1bfbb8b46a3CVE reference, Linux
- https://git.kernel.org/stable/c/ea3ebda47dd56f6e1c62f2e0e1b6e1b0a973e447CVE reference, Linux
- https://git.kernel.org/stable/c/272970be3dabd24cbe50e393ffee8f04aec3b9a8CVE 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.