Security readout for executives and security teams
Plain-English summary
CVE-2022-49377 is a Linux kernel use-after-free in block multi-queue handling. A local authenticated user could potentially trigger memory corruption with high confidentiality, integrity, and availability impact. The supplied sources do not show internet-remote exposure or confirmed exploitation.
Executive priority
Treat as a high-priority kernel maintenance issue, especially for shared Linux infrastructure. It is not presented as actively exploited, but the potential impact is high and remediation likely requires standard kernel patching plus reboot coordination.
Technical view
The issue is in blk-mq: blk_mq_run_hw_queues() could run after queue cleanup when the driver-owned tagset has been freed. The fix avoids touching ->tagset in blk_mq_get_sq_hctx and uses request-queue mappings instead, preventing use-after-free on tagset.
Likely exposure
Exposure is most likely on Linux systems running affected or unpatched kernel builds in the cited version lines. CVSS shows local attack vector with low privileges required. Distro backport status is not included in the bundle, so package-level exposure must be verified against vendor kernel advisories.
Exploitation context
The CVE is not listed as KEV in the supplied bundle, and no cited source confirms active exploitation. The risk is still material because kernel use-after-free flaws can affect host stability and privilege boundaries when reachable by local users or workloads.
Researcher notes
The source bundle identifies CWE-416 and CVSS 7.8 with AV:L/PR:L/UI:N. The technical root cause is tagset lifetime after blk_cleanup_queue(). Affected-version evidence is incomplete at distro level; validate with vendor backports and the referenced stable commits.
Mitigation direction
- Apply vendor kernel updates containing the referenced stable Linux fixes.
- Check distribution advisories for backported fixes before relying on upstream version numbers.
- Prioritize multi-user servers, container hosts, CI runners, and shared developer systems.
- Reboot into the fixed kernel after patch installation.
- If patching is delayed, reduce local shell access and untrusted workload execution.
Validation and detection
- Inventory kernel versions across Linux hosts and images.
- Compare installed vendor kernel builds against distro advisories for CVE-2022-49377.
- Confirm the running kernel changed after reboot, not only the installed package.
- Track hosts with local users, containers, or shared workloads as higher priority.
- Review vulnerability scanner findings for backport-aware status, not raw upstream version only.
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-2022-49377 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/460aa288c5cd0544dcf933a2f0ad0e8c6d2d35ffCVE reference, Linux
- https://git.kernel.org/stable/c/b140bac470b4f707cda59c7266214246238661dfCVE reference, Linux
- https://git.kernel.org/stable/c/70fdd922c7bf8949f8df109cf2635dff64c90392CVE reference, Linux
- https://git.kernel.org/stable/c/5d05426e2d5fd7df8afc866b78c36b37b00188b7CVE 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.