Security readout for executives and security teams
Plain-English summary
CVE-2023-52477 is a Linux kernel USB hub flaw that can crash the kernel when USB BOS descriptor setup fails and later code assumes that data exists. The practical business concern is availability: affected systems may oops or reboot depending on configuration.
Executive priority
Treat as a patching and uptime risk, not a confirmed breach indicator. Prioritize servers, kiosks, endpoints, and appliances where USB access or device churn is plausible.
Technical view
Linux USB hub code in drivers/usb/core accessed udev->bos fields without confirming allocation after usb_get_bos_descriptor() failure. The fix adds guarded fallback behavior and skips BOS-dependent features, including LPM checks, SuperSpeed capability checks, and U1/U2 state setup.
Likely exposure
Exposure is most relevant to Linux systems running affected kernel versions with USB hub/device handling enabled. The provided sources do not establish network reachability or a remote attack path.
Exploitation context
The source describes a kernel NULL pointer dereference during USB hub workqueue processing after BOS descriptor retrieval fails. It does not cite public exploitation, weaponized proof of concept, or CISA KEV listing.
Researcher notes
Evidence supports a NULL pointer dereference when udev->bos is unavailable. The bundle lacks CVSS, CWE, exploitability analysis, and distribution-specific fixed package versions, so validation should rely on vendor kernel advisories and commit lineage.
Mitigation direction
- Prioritize vendor kernel updates that include the referenced stable fixes.
- Check distribution advisories for backported fixes matching your kernel package.
- Limit untrusted physical USB device access where operationally feasible.
- Monitor affected systems for kernel oops or crashes in USB hub paths.
Validation and detection
- Inventory Linux kernel versions across systems with USB enabled.
- Compare running kernels against vendor advisories and stable fix references.
- Review kernel logs for hub_event or hub_port_reset NULL dereference traces.
- Confirm patched kernels include guarded udev->bos access behavior.
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.
CVE-2023-52477 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/c64e4dca9aefd232b17ac4c779b608b286654e81CVE reference
- https://git.kernel.org/stable/c/8e7346bfea56453e31b7421c1c17ca2fb9ed613dCVE reference
- https://git.kernel.org/stable/c/6ad3e9fd3632106696692232bf7ff88b9f7e1bc3CVE reference
- https://git.kernel.org/stable/c/241f230324337ed5eae3846a554fb6d15169872cCVE reference
- https://git.kernel.org/stable/c/528f0ba9f7a4bc1b61c9b6eb591ff97ca37cac6bCVE reference
- https://git.kernel.org/stable/c/fb9895ab9533534335fa83d70344b397ac862c81CVE reference
- https://git.kernel.org/stable/c/136f69a04e71ba3458d137aec3bb2ce1232c0289CVE reference
- https://git.kernel.org/stable/c/f74a7afc224acd5e922c7a2e52244d891bbe44eeCVE 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.