Security readout for executives and security teams
Plain-English summary
This is a Linux kernel availability issue affecting specific NVMe multipath conditions. If blktrace is enabled, a flush completion can hit a null pointer and crash the kernel. The business impact is service disruption on affected hosts, not data theft or privilege escalation based on the provided sources.
Executive priority
Handle through normal kernel maintenance unless affected systems are critical storage infrastructure or tracing is routinely enabled. Escalate patch timing for production hosts where an availability outage would materially affect services.
Technical view
The NVMe completion path can call trace_block_bio_complete on a flush request whose req->bio is NULL. With NVMe multipath and blktrace active, nvme_trace_bio_complete can dereference that NULL bio, triggering a kernel oops. The upstream fix adds a req->bio NULL check before tracing bio completion.
Likely exposure
Exposure is likely limited to Linux systems running affected kernel builds with NVMe multipath and blktrace enabled. The CVE lists Linux kernel versions and commits as affected, but the supplied bundle does not enumerate distribution package names or downstream fixed package versions.
Exploitation context
The CVSS vector is local with low privileges and no user interaction, impacting availability only. The source bundle does not indicate public exploitation, and KEV is false. Treat this as a denial-of-service risk under specific storage tracing and multipath conditions.
Researcher notes
The vulnerability is a CWE-476 NULL pointer dereference in Linux NVMe tracing behavior. Evidence supports a crash condition and upstream code fix, but not remote exploitation, data exposure, or confirmed exploitation in the wild.
Mitigation direction
- Update affected Linux kernels using vendor or distribution guidance.
- Prioritize systems using NVMe multipath where blktrace may be enabled.
- Review kernel stable commits referenced by the CVE for fixed branches.
- Disable unnecessary blktrace usage where operationally feasible until patched.
Validation and detection
- Inventory Linux kernel versions on NVMe multipath hosts.
- Check whether blktrace is enabled or used in operational workflows.
- Confirm vendor advisory status for your distribution kernel packages.
- Review crash logs for NULL pointer dereferences in nvme or blk trace 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
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Open ATT&CK lookupCVE-2022-50388 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.
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:H1.83.6Primary CVE scoreVulnerability 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
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/f13301a69ababa6c2236fb4f0393b7e914e7e1e0CVE reference
- https://git.kernel.org/stable/c/4df413d46960f11c8c105238cfc3f5ff4c95c003CVE reference
- https://git.kernel.org/stable/c/fcd2d199486033223e9b2a6a7f9a01dd0327eac3CVE reference
- https://git.kernel.org/stable/c/183c2aaef40a91acbaae45c3824d6cde7bb62b10CVE reference
- https://git.kernel.org/stable/c/3659fb5ac29a5e6102bebe494ac789fd47fb78f4CVE reference
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.