Security readout for executives and security teams
Plain-English summary
CVE-2023-53291 is a Linux kernel availability flaw in the rcuscale test module. When its kfree_rcu_test path is used and the module is unloaded, leftover worker threads may continue running and crash the kernel. The disclosed impact is denial of service, not data theft or privilege escalation.
Executive priority
Treat this as a moderate-priority Linux availability issue. It is most urgent for environments allowing local kernel module testing or untrusted local shell access. Prioritize normal kernel patching cycles unless vendor guidance or internal exposure shows the rcuscale path is reachable.
Technical view
The issue is that kfree_scale_thread instances can survive rcuscale module removal. Those threads may later fetch instructions from unloaded module memory, producing a supervisor instruction-fetch page fault and kernel oops. The upstream fix calls kfree_scale_cleanup() from rcu_scale_cleanup() during module removal.
Likely exposure
Exposure appears limited to Linux systems with affected kernels where the rcuscale module and kfree_rcu_test functionality are present and locally usable. The source describes a local module load, test run, and unload sequence. Production systems that do not include or permit this test module have lower practical exposure.
Exploitation context
The CVSS vector is local, low complexity, low privileges, no user interaction, with high availability impact. The source bundle marks KEV as false and provides no evidence of active exploitation. The public description demonstrates a crash scenario but does not show real-world abuse.
Researcher notes
Evidence is strongest for a local denial-of-service bug in a kernel test module path. No CWE is listed, no CPEs are provided, and the affected version data is sparse. The remediation direction is the upstream stable patch set, with downstream validation required per distribution kernel.
Mitigation direction
- Apply Linux vendor kernel updates containing the referenced stable fixes.
- Check vendor advisories before assuming a specific downstream package version is fixed.
- Avoid enabling or loading rcuscale test functionality on production systems unless required.
- Restrict local ability to load and unload kernel modules where operationally feasible.
Validation and detection
- Inventory Linux kernel versions and compare them with vendor fixed releases.
- Check whether rcuscale is built, installed, or loadable on affected hosts.
- Confirm patched kernels include the rcuscale cleanup fix from stable commits.
- Review operational procedures for unnecessary kernel test module use in production.
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
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CVE-2023-53291 mapping review
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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.
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:N/I:N/A:H1.83.6CISA-ADPVulnerability 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
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/604d6a5ff718874904b0fe614878a42b42c0d699CVE reference, Linux
- https://git.kernel.org/stable/c/f766d45ab294871a3d588ee76c666852f151cad9CVE reference, Linux
- https://git.kernel.org/stable/c/b8a6ba524d41f4da102e65f90498d9a910839621CVE reference, Linux
- https://git.kernel.org/stable/c/1dd7547c7610723b2b6afe1a3c4ddb2bde63387cCVE reference, Linux
- https://git.kernel.org/stable/c/29b1da4f90fc42c91beb4e400d926194925ad31bCVE reference, Linux
- https://git.kernel.org/stable/c/23fc8df26dead16687ae6eb47b0561a4a832e2f6CVE 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.