Security readout for executives and security teams
Plain-English summary
CVE-2023-53366 is a Linux kernel crash bug in block I/O polling. A local user with the ability to run relevant I/O workloads could trigger a kernel NULL pointer dereference, causing service disruption. The sources do not show data theft, privilege escalation, or active exploitation.
Executive priority
Treat as a moderate availability risk. Patch through normal kernel maintenance, faster for multi-user compute, storage-heavy, or high-availability Linux hosts. No source indicates remote exploitation or current active exploitation.
Technical view
The flaw is CWE-476 in Linux block polling. In shared poll-queue scenarios, one task can complete another task's polled I/O and recycle a bio before the original polling task finishes, leaving bio->bi_bdev NULL in bio_poll. CVSS is 5.5 with local, low-privilege availability impact.
Likely exposure
Exposure is most relevant to Linux systems running affected kernel versions and workloads using polled block I/O, including io_uring-related paths shown in the crash trace. Internet exposure is not indicated because the CVSS vector is local.
Exploitation context
The bundle does not report CISA KEV listing or active exploitation. The described failure requires local access and a timing-sensitive polled I/O condition involving shared poll queues. Impact is denial of service through kernel crash, not confidentiality or integrity compromise.
Researcher notes
The evidence is a kernel crash report and three stable commit references. Affected-version detail in the bundle is limited and should be reconciled with distribution advisories. Do not assume exploitability beyond local denial of service from the provided sources.
Mitigation direction
- Apply vendor Linux kernel updates containing the referenced stable block-layer fix.
- Prioritize systems using io_uring or polled block I/O workloads.
- Check distribution advisories for affected and fixed kernel package versions.
- Reduce untrusted local workload access where prompt patching is delayed.
Validation and detection
- Inventory Linux kernel versions against vendor advisories for CVE-2023-53366.
- Confirm the running kernel includes one of the referenced stable commits or vendor backport.
- Review crash logs for bio_poll, iocb_bio_iopoll, or io_uring_enter traces.
- Identify hosts running applications that use polled I/O 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
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-476: 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-2023-53366 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/1af0bdca03f367874da45d6cbe05fa05b90b1439CVE reference, Linux
- https://git.kernel.org/stable/c/0510d5e654d05053ed0e6309a9b42043ac9903abCVE reference, Linux
- https://git.kernel.org/stable/c/310726c33ad76cebdee312dbfafc12c1b44bf977CVE 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.