Security readout for executives and security teams
Plain-English summary
This is a Linux kernel availability flaw in SMC networking. A local, low-privileged user could trigger a locking deadlock that can hang affected kernel workqueue activity and impact service availability. The source bundle does not show data theft, privilege escalation, remote attack, or active exploitation.
Executive priority
Treat as a routine but real availability patch. It is not presented as remotely exploitable or actively exploited, but affected multi-user or shared Linux systems should be updated through normal kernel maintenance windows.
Technical view
CVE-2023-53233 fixes a deadlock in net/smc involving cancel_delayed_work_sync(), SMC link group cleanup, and the SMC transmit workqueue. It is classified as CWE-667 with CVSS 5.5: local attack vector, low complexity, low privileges, no user interaction, and high availability impact only.
Likely exposure
Exposure is most relevant to Linux systems running affected kernel builds with SMC networking available. The bundle identifies Linux kernel 5.8 lineage and stable fixes around 5.10.176, 5.15.104, 6.1.21, 6.2.8, and 6.3. Validate against vendor kernel packages, not only upstream version strings.
Exploitation context
The evidence supports a local denial-of-service style condition, not remote compromise. KEV is false, and the provided sources do not claim public exploitation. Practical risk depends on whether untrusted local users or workloads can exercise AF_SMC behavior on affected systems.
Researcher notes
The record centers on a circular locking dependency in SMC cleanup paths. The provided description includes lockdep evidence and upstream stable commit references, but not a detailed affected distribution matrix. Avoid assuming exposure without confirming kernel configuration and vendor backports.
Mitigation direction
- Update to a vendor kernel containing the referenced upstream stable fixes.
- Prioritize shared hosts, multi-tenant Linux systems, and systems allowing untrusted local users.
- Check distribution advisories for backported fixes and package-specific affected versions.
- Restrict untrusted local shell or workload access where patching is delayed.
- Track vendor guidance if upstream version mapping is unclear.
Validation and detection
- Inventory Linux kernel versions and distribution package release numbers.
- Confirm whether SMC networking support is present or loaded.
- Compare packages against vendor advisories and listed stable fix levels.
- Review kernel logs for SMC-related deadlock or lockdep warnings.
- Confirm patched kernels boot successfully in representative environments.
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-667: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-53233 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.
SSVC decision data
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:H1.83.6CISA-ADPVulnerability 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
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/9708efad9ba5095b9bb7916e11a135b3bd66c071CVE reference, Linux
- https://git.kernel.org/stable/c/b615238e5bc01e13dc0610febddc1ca99bab1df6CVE reference, Linux
- https://git.kernel.org/stable/c/3517584cf1b35bd02f4a90267ddf9dcf17bd9c87CVE reference, Linux
- https://git.kernel.org/stable/c/c9ca2257150272df1b8d9ebe5059197ffea6e913CVE reference, Linux
- https://git.kernel.org/stable/c/13085e1b5cab8ad802904d72e6a6dae85ae0cd20CVE 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 Locking
Improper Locking represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.