Security readout for executives and security teams
Plain-English summary
This Linux kernel issue is a local availability risk in the UBI flash-storage subsystem. A user with local privileges may trigger a memory leak while resizing a UBI volume, potentially degrading or exhausting system resources over time. It does not indicate data theft or data modification in the supplied sources.
Executive priority
Treat this as a normal patch-cycle kernel availability issue, with higher priority for embedded, appliance, or edge systems where downtime is costly and local access is shared or weakly controlled.
Technical view
ubi_resize_volume() creates a new EBA table with ubi_eba_create_table() but frees it with kfree(), leaving nested entries allocated. The fix replaces kfree(new_eba_tbl) with ubi_eba_destroy_table(new_eba_tbl). CVSS is 5.5: local attack vector, low complexity, low privileges, no user interaction, high availability impact.
Likely exposure
Exposure is most relevant to Linux systems using UBI, commonly embedded or flash-storage devices, where local users or services can perform UBI volume resize operations. Systems without UBI enabled or without reachable UBI management interfaces are less likely exposed.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. The issue requires local access and low privileges per CVSS. Evidence supports resource exhaustion risk, not remote compromise or privilege escalation.
Researcher notes
The public description is concise and centered on a kmemleak finding. Affected-version detail in the bundle is incomplete and should be reconciled with Linux stable trees or downstream vendor advisories before asserting exact fleet exposure.
Mitigation direction
- Apply a vendor kernel update containing the referenced stable fixes.
- Check Linux distribution or device-vendor advisories for backported patches.
- Restrict access to UBI device nodes and volume-management utilities.
- Reduce unnecessary local shell or service access on affected devices.
- Monitor memory pressure and unexplained availability degradation.
Validation and detection
- Inventory Linux kernel versions on systems using UBI storage.
- Confirm whether UBI modules, devices, or ubirsvol workflows are present.
- Map installed kernels against vendor fixed packages or stable commits.
- Review permissions on UBI character devices and management tools.
- Check logs and monitoring for repeated resize operations or memory pressure.
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
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2023-53271 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/09780a44093b53f9cbca76246af2e4ff0884e512CVE reference, Linux
- https://git.kernel.org/stable/c/26ec2d66aecab8ff997b912c20247fedba4f5740CVE reference, Linux
- https://git.kernel.org/stable/c/07b60f7452d2fa731737552937cb81821919f874CVE reference, Linux
- https://git.kernel.org/stable/c/31d60afe2cc2b712dbefcaab6b7d6a47036f844eCVE reference, Linux
- https://git.kernel.org/stable/c/95a72417dd13ebcdcb1bd0c5d4d15f7c5bfbb288CVE reference, Linux
- https://git.kernel.org/stable/c/27b760b81951d8d5e5c952a696af8574052b0709CVE reference, Linux
- https://git.kernel.org/stable/c/5c0c81a313492b83bd0c038b8839b0e04eb87563CVE reference, Linux
- https://git.kernel.org/stable/c/1e591ea072df7211f64542a09482b5f81cb3ad27CVE 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.