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CVE Record

CVE-2023-52493: bus: mhi: host: Drop chan lock before queuing buffers

In the Linux kernel, the following vulnerability has been resolved: bus: mhi: host: Drop chan lock before queuing buffers Ensure read and write locks for the channel are not taken in succession by dropping the read lock from parse_xfer_event() such that a callback given to client can potentially queue buffers and acquire the write lock in that process. Any queueing of buffers should be done without channel read lock acquired as it can result in multiple locks and a soft lockup. [mani: added fixes tag and cc'ed stable]

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2023-52493 is a Linux kernel availability bug in the MHI host bus code. A locking mistake can cause a soft lockup when callbacks queue buffers. The provided sources do not show data theft, privilege escalation, or active exploitation, but affected systems may hang or become unreliable until patched.

Executive priority

Treat as a routine but real availability risk. Prioritize patching systems where kernel hangs would disrupt connectivity, production availability, or remote management. Escalation is lower without KEV listing, CVSS, or exploitation evidence in the provided sources.

Technical view

The fix drops the channel read lock in parse_xfer_event() before client callbacks can queue buffers and acquire the write lock. Holding the read lock during buffer queueing can create nested lock acquisition and a soft lockup in Linux MHI host channel handling.

Likely exposure

Exposure is most likely on Linux systems using the MHI host subsystem, commonly tied to modem or device connectivity stacks. The bundle lists Linux kernel versions as affected and provides stable kernel fix commits, but does not identify specific distributions beyond a Debian LTS advisory.

Exploitation context

The provided sources do not cite active exploitation, and KEV is false. They also do not describe a public exploit path or attacker prerequisites. Based on the description, the main security impact is denial of service through kernel soft lockup, not confirmed code execution.

Researcher notes

Evidence is limited to the CVE record, Linux stable commits, and a Debian LTS notice. The root cause is lock ordering around MHI channel callbacks and buffer queueing. No source in the bundle provides exploitability details, CVSS scoring, or a non-patch mitigation.

Mitigation direction

  • Apply kernel updates containing the referenced stable MHI host fixes.
  • Follow Linux vendor or distribution advisories for packaged kernel remediation.
  • For Debian LTS systems, review and apply the referenced Debian security update.
  • If patching is delayed, monitor affected hosts for soft lockups or unexplained hangs.

Validation and detection

  • Inventory Linux hosts and appliances running kernels with MHI host support.
  • Confirm whether deployed kernels include the referenced stable fix commits.
  • Check distro package changelogs for CVE-2023-52493 remediation.
  • Review kernel logs for MHI-related lockups or soft lockup warnings.
Prepared
Confidence
medium
Sources
9

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.

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CVE-2023-52493 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
8Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1d3173a3bae7039b765a0956e3e4bf846dbaacb8, 1d3173a3bae7039b765a0956e3e4bf846dbaacb8, 1d3173a3bae7039b765a0956e3e4bf846dbaacb8, 1d3173a3bae7039b765a0956e3e4bf846dbaacb8, 1d3173a3bae7039b765a0956e3e4bf846dbaacb8, 1d3173a3bae7039b765a0956e3e4bf846dbaacb8unaffected
LinuxLinux5.7, 0, 5.10.210, 5.15.149, 6.1.76, 6.6.15, 6.7.3, 6.8affected
Weakness

CWE details

No CWE listed

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