Security readout for executives and security teams
Plain-English summary
This is a Linux kernel memory-management flaw in the VMware paravirtual RDMA driver path. A local low-privileged user could potentially trigger serious confidentiality, integrity, and availability impact, but exploitation is rated high complexity and requires local access.
Executive priority
Treat as a high-priority kernel maintenance item, especially for multi-user Linux, virtualization, or workload-hosting environments. There is no supplied evidence of active exploitation, so prioritize patching through normal emergency kernel channels rather than incident response escalation.
Technical view
The resolved kernel issue is a double free in pvrdma_alloc_ucontext() error handling. The source says pvrdma_uar_free() is already called inside pvrdma_dealloc_ucontext(), so calling it before deallocation frees the same resource twice.
Likely exposure
Exposure appears limited to Linux systems running affected kernel versions or commit lineages with the RDMA/vmw_pvrdma code present. Systems without this driver path enabled or reachable by local users are likely lower exposure, but the bundle does not provide full distribution-specific scope beyond Linux and Red Hat references.
Exploitation context
The CVSS vector is local, high complexity, low privileges required, no user interaction, with high CIA impact. KEV is false, and the provided sources do not state active exploitation or public weaponization.
Researcher notes
Focus review on the pvrdma_alloc_ucontext() error path and resource ownership around pvrdma_uar_free() and pvrdma_dealloc_ucontext(). The bundle identifies CWE-1341 and multiple stable commits, but does not provide proof-of-concept details or distribution-level exploitability conditions.
Mitigation direction
- Apply vendor kernel updates that include the referenced stable fixes.
- Review Red Hat RHSA advisories if using affected Red Hat platforms.
- Track distribution advisories for backported fixes, not only upstream version numbers.
- If RDMA/vmw_pvrdma is unused, check vendor guidance for reducing exposure.
Validation and detection
- Inventory Linux kernel versions across hosts and images.
- Determine whether affected vmw_pvrdma/RDMA kernel code is present or enabled.
- Confirm installed kernel packages map to fixed vendor advisories.
- Verify the kernel includes the relevant upstream stable fix or backport.
- Prioritize shared systems where untrusted local users have shell or workload access.
Public sources used
- CVE Program
- CVE List V5
- Linux stable commit 269967d76933
- Linux stable commit 1df5711121cd
- Linux stable commit 3a231c34c5bc
- Linux stable commit ecc36a82ecfc
- Linux stable commit 45d25e3ec179
- Linux stable commit 0c63333ff97b
- Linux stable commit 935ee27d0904
- Linux stable commit e38e86995df2
- Red Hat CVE page
- Red Hat Bugzilla 2482588
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-1341: 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-2026-46189 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/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.
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:H/PR:L/UI:N/S:U/C:H/I:H/A:H15.9redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/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.
- ADP timelineredhat-SADP
Reported to Red Hat.
- ADP timelineredhat-SADP
Made public.
- 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
- 2026-05-28T00:00:00.000Z: Reported to Red Hat.
- 2026-05-28T00:00:00.000Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/269967d7693304e1f06ed2dff4ebbbeeb397cda4CVE reference, Linux
- https://git.kernel.org/stable/c/1df5711121cdc11e76b889408fdbe459feba1d39CVE reference, Linux
- https://git.kernel.org/stable/c/3a231c34c5bc3d3cfc850b877758ec9fdaa8a483CVE reference, Linux
- https://git.kernel.org/stable/c/ecc36a82ecfcfdf3c6606d209f22ec5543c410e0CVE reference, Linux
- https://git.kernel.org/stable/c/45d25e3ec17900bf5a9d6876ff16ceee31c4c0e0CVE reference, Linux
- https://git.kernel.org/stable/c/0c63333ff97bd1275294fd12840a0efe9d7a4c59CVE reference, Linux
- https://git.kernel.org/stable/c/935ee27d0904aa944cbcc979094c20e5ef62eeadCVE reference, Linux
- https://git.kernel.org/stable/c/e38e86995df27f1f854063dab1f0c6a513db3fafCVE reference, Linux
- https://access.redhat.com/security/cve/CVE-2026-46189CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2482588CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46189.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:33685CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36073CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36767CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:38902CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:30848CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:33743CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:40068CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:40760CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:36049CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:35904CVE reference, redhat-SADP · vendor-advisory, x_refsource_REDHAT
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.
Multiple Releases of Same Resource or Handle
Multiple Releases of Same Resource or Handle represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.