Security readout for executives and security teams
Plain-English summary
CVE-2023-53398 is a Linux kernel use-after-free flaw in the mlx5 PTP queue handling path. A local, low-privileged attacker could potentially trigger memory misuse with high impact to confidentiality, integrity, and availability. The provided sources do not show active exploitation.
Executive priority
Treat as a high-priority kernel maintenance item, especially for shared Linux infrastructure. The flaw requires local access, so urgency is lower than remote unauthenticated issues, but kernel memory corruption can carry serious business impact if local users or workloads are untrusted.
Technical view
The mlx5 driver failed to check FIFO indexes during pop operations, creating a potential use-after-free when an empty queue was popped during re-sync. The description links this to out-of-order CQEs draining the queue. Fixes add pointer/index checks and avoid re-sync when the SKB cannot exist in the FIFO.
Likely exposure
Exposure appears limited to Linux systems running affected kernel builds with the mlx5 driver path present. The source bundle lists Linux kernel affected entries including 6.0, 6.1.18, 6.2.5, and 6.3, but exact downstream distro exposure requires vendor package mapping.
Exploitation context
The CVSS vector is local, low complexity, low privileges, no user interaction, with high confidentiality, integrity, and availability impact. The provided KEV flag is false, and no cited source in the bundle states active exploitation.
Researcher notes
The core issue is CWE-416 in mlx5 PTP FIFO handling. The source describes unchecked FIFO indexes during pop and out-of-order CQEs causing queue drain. The stable fixes add checks around consumer and producer index bounds and guard re-sync when the SKB ID is not valid for the FIFO.
Mitigation direction
- Apply Linux kernel updates that include the referenced stable fixes.
- Check distribution advisories for backported fixes before relying on version strings.
- Prioritize multi-user, shared, and tenant-accessible Linux hosts.
- Track vendor guidance if a patched package is not yet available.
Validation and detection
- Inventory running Linux kernel versions across affected fleets.
- Map installed kernel packages to vendor advisories or fixed stable commits.
- Confirm rebooted hosts are running the patched kernel.
- Identify systems using mlx5-related driver functionality for prioritization.
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-2023-53398 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/52e6e7a0bc04c85012a9251c7cf2d444a77eb966CVE reference, Linux
- https://git.kernel.org/stable/c/6afdedc4e66e3846ce497744f01b95c34bf39d21CVE reference, Linux
- https://git.kernel.org/stable/c/3a50cf1e8e5157b82268eee7e330dbe5736a0948CVE 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.