Security readout for executives and security teams
Plain-English summary
CVE-2022-50639 is a Linux kernel memory leak in io-wq worker creation, found by Syzkaller fuzzing. Under a specific allocation failure, kernel memory for an io_wqe structure is not freed. The public record does not show active exploitation or a CVSS score.
Executive priority
Treat as routine-to-priority kernel maintenance, not an emergency, unless you operate multi-user or untrusted-workload Linux systems. Patch through normal kernel update channels after confirming distribution impact.
Technical view
The flaw is in Linux kernel io-wq creation. If CPU mask allocation for a node fails, error handling misses freeing the current node’s io_wqe allocation because it was not added to the wqes array. The trace reaches io_uring_setup, indicating local io_uring activity is the relevant path.
Likely exposure
Exposure is likely limited to Linux systems running affected kernel versions where local users or workloads can invoke io_uring_setup. The source bundle lists Linux kernel 5.14-era affected ranges and stable fix references, but distribution-specific status must be checked.
Exploitation context
The issue was observed during fuzzing, not reported as exploited in the wild. No KEV listing is provided. Practical abuse would require triggering the allocation-failure error path and could plausibly affect availability through memory leakage, but public evidence is limited.
Researcher notes
The record lacks CVSS, CWE, and detailed affected range semantics beyond Linux kernel versions and stable commits. The root cause is a missed free on an io_wq_create error path. Avoid assuming remote exposure; evidence points to local syscall context.
Mitigation direction
- Update to a vendor kernel containing the referenced stable Linux fixes.
- Check your Linux distribution advisory for affected and fixed package versions.
- Restrict unnecessary local access on systems pending kernel updates.
- Review io_uring hardening options only if recommended by your vendor.
Validation and detection
- Inventory Linux kernel versions across servers, containers hosts, and appliances.
- Compare installed kernels against distribution advisories for CVE-2022-50639.
- Confirm the running kernel includes the referenced stable fix commits.
- Monitor for unusual local memory pressure until remediation is complete.
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
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CVE-2022-50639 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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
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.