Security readout for executives and security teams
Plain-English summary
This is a Linux kernel memory-safety flaw in block I/O throttling. A local authenticated user or workload could trigger a use-after-free condition while storage I/O is being throttled, with potential impact to confidentiality, integrity, and availability. No source in the bundle says it is being actively exploited.
Executive priority
Prioritize remediation in normal high-severity kernel patch cycles, faster for shared infrastructure. The business risk is local compromise or disruption on affected Linux hosts, not confirmed remote exploitation.
Technical view
The flaw is a CWE-416 use-after-free in blk-throttle. When a bio was throttled, BIO_THROTTLED could be set after the timer started and after the bio had completed, leading to access of freed memory. The kernel fix moves BIO_THROTTLED setting into the queue_lock-protected section.
Likely exposure
Exposure is most relevant to Linux systems running affected kernel versions where local users, services, containers, or tenants can generate block device I/O. The CVSS vector is local, low complexity, privileges required, and no user interaction.
Exploitation context
The source bundle provides a KASAN crash trace and CVSS 7.8 scoring, but no exploit code, public exploitation report, or CISA KEV listing. Treat this as a local kernel privilege-risk issue until vendor guidance says otherwise.
Researcher notes
Focus validation on kernel lineage and whether the blk-throttle fix is present. The source data has incomplete affected-version presentation, so distribution-specific advisories are needed for precise package mapping.
Mitigation direction
- Inventory Linux kernel versions across servers, endpoints, appliances, and cloud images.
- Apply vendor kernel updates that include the referenced stable Linux fixes.
- Prioritize shared, multi-user, container, CI, and virtualized hosts.
- Plan required reboots or live-patching according to vendor support guidance.
- If no package is available, track vendor advisories rather than inventing workarounds.
Validation and detection
- Confirm running kernel versions against vendor fixed package versions.
- Check whether distribution advisories reference CVE-2022-49465 or the listed stable commits.
- Verify patched systems booted into the updated kernel, not only installed it.
- Review crash telemetry for blk_throtl_bio or KASAN use-after-free indicators.
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-416: 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-2022-49465 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H/I:H/A:H1.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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/24ba80efaf6e772f6132465fad08e20fb4767da7CVE reference, Linux
- https://git.kernel.org/stable/c/047ea38d41d90d748bca812a43339632f52ba715CVE reference, Linux
- https://git.kernel.org/stable/c/0cfc8a0fb07cde61915e4a77c4794c47de3114a4CVE reference, Linux
- https://git.kernel.org/stable/c/935fa666534d7b7185e8c6b0191cd06281be4290CVE reference, Linux
- https://git.kernel.org/stable/c/5a011f889b4832aa80c2a872a5aade5c48d2756fCVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.