CVE-2023-53314 (GCVE-0-2023-53314)
Vulnerability from cvelistv5 – Published: 2025-09-16 16:11 – Updated: 2026-08-05 09:13
VLAI
EPSS
VEX
Title
fbdev/ep93xx-fb: Do not assign to struct fb_info.dev
Summary
In the Linux kernel, the following vulnerability has been resolved:
fbdev/ep93xx-fb: Do not assign to struct fb_info.dev
Do not assing the Linux device to struct fb_info.dev. The call to
register_framebuffer() initializes the field to the fbdev device.
Drivers should not override its value.
Fixes a bug where the driver incorrectly decreases the hardware
device's reference counter and leaks the fbdev device.
v2:
* add Fixes tag (Dan)
Severity
7.8 (High)
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:25 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
88017bda96a5fd568a982b01546c8fb1782dda62 , < ffdf2b020db717853167391a3a8d912e13428fa6
(git)
Affected: 88017bda96a5fd568a982b01546c8fb1782dda62 , < 1c6ff2a7c593db851f23e31ace2baf557ea9d0ff (git) Affected: 88017bda96a5fd568a982b01546c8fb1782dda62 , < 8ffa40ff64aa43a9a28fcf209b48d86a3e0f4972 (git) Affected: 88017bda96a5fd568a982b01546c8fb1782dda62 , < 4aade6c9100a3537788b6a9c7ac481037d19efdf (git) Affected: 88017bda96a5fd568a982b01546c8fb1782dda62 , < 309c27162afea79b3c7f8747bb650faf6923b639 (git) Affected: 88017bda96a5fd568a982b01546c8fb1782dda62 , < f83c1b13f8154e0284448912756d0a351a1a602a (git) Affected: 88017bda96a5fd568a982b01546c8fb1782dda62 , < 0517fc5a71333b315164736bbd32608894fbb872 (git) Affected: 88017bda96a5fd568a982b01546c8fb1782dda62 , < f90a0e5265b60cdd3c77990e8105f79aa2fac994 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.32
Unaffected: 0 , < 2.6.32 (semver) Unaffected: 4.14.326 , ≤ 4.14.* (semver) Unaffected: 4.19.295 , ≤ 4.19.* (semver) Unaffected: 5.4.257 , ≤ 5.4.* (semver) Unaffected: 5.10.195 , ≤ 5.10.* (semver) Unaffected: 5.15.132 , ≤ 5.15.* (semver) Unaffected: 6.1.54 , ≤ 6.1.* (semver) Unaffected: 6.5.4 , ≤ 6.5.* (semver) Unaffected: 6.6 , ≤ * (original_commit_for_fix) |
guessed |
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{
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"value": "AV:L - The bug is in the ep93xx-fb platform driver probe/remove path for the on-SoC Cirrus EP93xx LCD controller; it is reached only locally via boot probe, module load, or sysfs bind/unbind, with no network or hot-plug physical entry point.\nAC:L - The incorrect info-\u003edev assignment and resulting device refcount imbalance are deterministic on probe/unregister; the attacker does not depend on a race or an uncontrolled memory layout.\nPR:L - Although sysfs bind/unbind is root-owned 0200, the highest reasonable actor is a low-privileged local user on an EP93xx system where the framebuffer is already bound and /dev/fbN is usable, so PR:L is chosen over PR:H.\nUI:N - Exploitation does not require a separate victim action such as mounting a filesystem or manually opening a device beyond the attacker\u2019s own local access.\nS:U - Impact stays within the host kernel\u2019s device/refcount authority; this is not a VM escape, IOMMU bypass, or other cross-boundary break.\nC:H - Incorrectly dropping the hardware device\u2019s reference count can free the live platform device while fbdev code still uses it, yielding a use-after-free that can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same device UAF is exploitable for heap reuse and arbitrary write/control-flow hijack primitives against kernel memory, not merely a benign bookkeeping error.\nA:H - A device UAF or bad put on the platform device can oops/panic the kernel on unregister or later fbdev use, and the companion fbdev device leak is secondary to that crash impact."
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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