CVE-2025-21872 (GCVE-0-2025-21872)
Vulnerability from cvelistv5 – Published: 2025-03-27 14:57 – Updated: 2026-11-05 20:41
VLAI
EPSS
VEX
Title
efi: Don't map the entire mokvar table to determine its size
Summary
In the Linux kernel, the following vulnerability has been resolved:
efi: Don't map the entire mokvar table to determine its size
Currently, when validating the mokvar table, we (re)map the entire table
on each iteration of the loop, adding space as we discover new entries.
If the table grows over a certain size, this fails due to limitations of
early_memmap(), and we get a failure and traceback:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at mm/early_ioremap.c:139 __early_ioremap+0xef/0x220
...
Call Trace:
<TASK>
? __early_ioremap+0xef/0x220
? __warn.cold+0x93/0xfa
? __early_ioremap+0xef/0x220
? report_bug+0xff/0x140
? early_fixup_exception+0x5d/0xb0
? early_idt_handler_common+0x2f/0x3a
? __early_ioremap+0xef/0x220
? efi_mokvar_table_init+0xce/0x1d0
? setup_arch+0x864/0xc10
? start_kernel+0x6b/0xa10
? x86_64_start_reservations+0x24/0x30
? x86_64_start_kernel+0xed/0xf0
? common_startup_64+0x13e/0x141
</TASK>
---[ end trace 0000000000000000 ]---
mokvar: Failed to map EFI MOKvar config table pa=0x7c4c3000, size=265187.
Mapping the entire structure isn't actually necessary, as we don't ever
need more than one entry header mapped at once.
Changes efi_mokvar_table_init() to only map each entry header, not the
entire table, when determining the table size. Since we're not mapping
any data past the variable name, it also changes the code to enforce
that each variable name is NUL terminated, rather than attempting to
verify it in place.
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 20:35 UTC
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < 46c0454ffb78ce9d3355a3cccac86383ea8ddd55
(git)
Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < f17a72ac7dd6f9469c9e6185bdbb22dbb744dd74 (git) Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < ea3f0b362dfe4ef885ef812bfaf4088176422c91 (git) Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < 65f4aebb8127708ba668dd938e83b8558abfc5cd (git) Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < 97bd560b6cc4c26386a53b4881bf03e96f9ba03a (git) Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < 2b90e7ace79774a3540ce569e000388f8d22c9e0 (git) |
guessed | |
| Linux | Linux |
Affected:
5.10
Unaffected: 0 , < 5.10 (semver) Unaffected: 5.10.235 , ≤ 5.10.* (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.6.83 , ≤ 6.6.* (semver) Unaffected: 6.12.18 , ≤ 6.12.* (semver) Unaffected: 6.13.6 , ≤ 6.13.* (semver) Unaffected: 6.14 , ≤ * (original_commit_for_fix) |
guessed |
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"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: efi: No asigne toda la tabla mokvar para determinar su tama\u00f1o Actualmente, al validar la tabla mokvar, (re)asignamos la tabla completa en cada iteraci\u00f3n del bucle, agregando espacio a medida que descubrimos nuevas entradas. Si la tabla crece por encima de cierto tama\u00f1o, esto falla debido a las limitaciones de early_memmap(), y obtenemos un error y seguimiento: ------------[ cortar aqu\u00ed ]------------ ADVERTENCIA: CPU: 0 PID: 0 en mm/early_ioremap.c:139 __early_ioremap+0xef/0x220 ... Seguimiento de llamada: ? __early_ioremap+0xef/0x220 ? __warn.cold+0x93/0xfa ? __early_ioremap+0xef/0x220 ? report_bug+0xff/0x140 ? early_fixup_exception+0x5d/0xb0 ? early_idt_handler_common+0x2f/0x3a ? __early_ioremap+0xef/0x220 ? efi_mokvar_table_init+0xce/0x1d0 ? setup_arch+0x864/0xc10 ? start_kernel+0x6b/0xa10 ? x86_64_start_reservations+0x24/0x30 ? x86_64_start_kernel+0xed/0xf0 ? common_startup_64+0x13e/0x141 ---[ fin del seguimiento 0000000000000000 ]--- mokvar: Error al asignar la tabla de configuraci\u00f3n EFI MOKvar pa=0x7c4c3000, tama\u00f1o=265187. No es necesario asignar toda la estructura, ya que no necesitamos asignar m\u00e1s de un encabezado de entrada a la vez. Se modifica efi_mokvar_table_init() para que solo asigne cada encabezado de entrada, no toda la tabla, al determinar el tama\u00f1o de la tabla. Dado que no se asignan datos m\u00e1s all\u00e1 del nombre de la variable, tambi\u00e9n se modifica el c\u00f3digo para que cada nombre de variable termine en NUL, en lugar de intentar verificarlo en su lugar."
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"id": "CVE-2025-21872",
"lastModified": "2026-11-05T21:17:44.470",
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"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"type": "Primary"
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"source": "Red Hat CSAF VEX",
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"title": "kernel: efi: Don\u0027t map the entire mokvar table to determine its size",
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.