CVE-2024-50199 (GCVE-0-2024-50199)
Vulnerability from cvelistv5 – Published: 2024-11-08 05:54 – Updated: 2026-05-11 20:47
VLAI
EPSS
VEX
Title
mm/swapfile: skip HugeTLB pages for unuse_vma
Summary
In the Linux kernel, the following vulnerability has been resolved:
mm/swapfile: skip HugeTLB pages for unuse_vma
I got a bad pud error and lost a 1GB HugeTLB when calling swapoff. The
problem can be reproduced by the following steps:
1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory.
2. Swapout the above anonymous memory.
3. run swapoff and we will get a bad pud error in kernel message:
mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7)
We can tell that pud_clear_bad is called by pud_none_or_clear_bad in
unuse_pud_range() by ftrace. And therefore the HugeTLB pages will never
be freed because we lost it from page table. We can skip HugeTLB pages
for unuse_vma to fix it.
Severity
5.5 (Medium)
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < ba7f982cdb37ff5a7739dec85d7325ea66fc1496
(git)
Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < 417d5838ca73c6331ae2fe692fab6c25c00d9a0b (git) Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < e41710f5a61aca9d6baaa8f53908a927dd9e7aa7 (git) Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < 6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf (git) Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < bed2b9037806c62166a0ef9a559a1e7e3e1275b8 (git) Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87 (git) Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < 7528c4fb1237512ee18049f852f014eba80bbe8d (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.36
Unaffected: 0 , < 2.6.36 (semver) Unaffected: 5.4.285 , ≤ 5.4.* (semver) Unaffected: 5.10.228 , ≤ 5.10.* (semver) Unaffected: 5.15.169 , ≤ 5.15.* (semver) Unaffected: 6.1.114 , ≤ 6.1.* (semver) Unaffected: 6.6.58 , ≤ 6.6.* (semver) Unaffected: 6.11.5 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/swapfile: omitir p\u00e1ginas HugeTLB para unuse_vma Obtuve un error pud incorrecto y perd\u00ed un HugeTLB de 1 GB al llamar a swapoff. El problema se puede reproducir mediante los siguientes pasos: 1. Asignar un HugeTLB an\u00f3nimo de 1 GB y otra memoria an\u00f3nima. 2. Intercambiar la memoria an\u00f3nima anterior. 3. Ejecutar swapoff y obtendremos un error pud incorrecto en el mensaje del kernel: mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7) Podemos decir que pud_clear_bad es llamado por pud_none_or_clear_bad en unuse_pud_range() por ftrace. Y por lo tanto, las p\u00e1ginas HugeTLB nunca se liberar\u00e1n porque las perdimos de la tabla de p\u00e1ginas. Podemos omitir las p\u00e1ginas HugeTLB para unuse_vma para solucionarlo."
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"cve": "CVE-2024-50199",
"id": "CVE-2024-50199",
"initial_release_date": "2024-11-08T00:00:00+00:00",
"product_status:fixed": "305",
"product_status:known_affected": "112",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: mm/swapfile: skip HugeTLB pages for unuse_vma",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-50199.json",
"version": "3"
}
}
}
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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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