CVE-2024-50199
Estado: ModificadaMedia (5.5)—
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:
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.
Detalles técnicos trazas, registros y código del informe original
mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7)
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.22%
- Percentil entre todas las CVEs puntuadas: 12
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b
- https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf
- https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d
- https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496
- https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8
- https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7
- https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
JSON original (NVD)
Mostrar
{
"id": "CVE-2024-50199",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 5.5,
"attackVector": "LOCAL",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 1.8
}
]
},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
"lessThan": "ba7f982cdb37ff5a7739dec85d7325ea66fc1496",
"versionType": "git"
},
{
"status": "affected",
"version": "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
"lessThan": "417d5838ca73c6331ae2fe692fab6c25c00d9a0b",
"versionType": "git"
},
{
"status": "affected",
"version": "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
"lessThan": "e41710f5a61aca9d6baaa8f53908a927dd9e7aa7",
"versionType": "git"
},
{
"status": "affected",
"version": "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
"lessThan": "6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf",
"versionType": "git"
},
{
"status": "affected",
"version": "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
"lessThan": "bed2b9037806c62166a0ef9a559a1e7e3e1275b8",
"versionType": "git"
},
{
"status": "affected",
"version": "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
"lessThan": "eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87",
"versionType": "git"
},
{
"status": "affected",
"version": "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
"lessThan": "7528c4fb1237512ee18049f852f014eba80bbe8d",
"versionType": "git"
}
],
"programFiles": [
"mm/swapfile.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.36"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.36",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.285",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.228",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.169",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.114",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.58",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.11.5",
"versionType": "semver",
"lessThanOrEqual": "6.11.*"
},
{
"status": "unaffected",
"version": "6.12",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"mm/swapfile.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2024-11-08T06:15:16.527",
"references": [
{
"url": "https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/swapfile: skip HugeTLB pages for unuse_vma\n\nI got a bad pud error and lost a 1GB HugeTLB when calling swapoff. The\nproblem can be reproduced by the following steps:\n\n 1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory.\n 2. Swapout the above anonymous memory.\n 3. run swapoff and we will get a bad pud error in kernel message:\n\n mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7)\n\nWe can tell that pud_clear_bad is called by pud_none_or_clear_bad in\nunuse_pud_range() by ftrace. And therefore the HugeTLB pages will never\nbe freed because we lost it from page table. We can skip HugeTLB pages\nfor unuse_vma to fix it."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/swapfile: omitir páginas HugeTLB para unuse_vma Obtuve un error pud incorrecto y perdí un HugeTLB de 1 GB al llamar a swapoff. El problema se puede reproducir mediante los siguientes pasos: 1. Asignar un HugeTLB anónimo de 1 GB y otra memoria anónima. 2. Intercambiar la memoria anónima 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 páginas HugeTLB nunca se liberarán porque las perdimos de la tabla de páginas. Podemos omitir las páginas HugeTLB para unuse_vma para solucionarlo."
}
],
"lastModified": "2026-06-17T08:03:51.290",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "0EF2E377-4BC3-4B1A-BF12-0F91612E62D9",
"versionEndExcluding": "5.4.285",
"versionStartIncluding": "2.6.36"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "9062315F-AB89-4ABE-8C13-B75927689F66",
"versionEndExcluding": "5.10.228",
"versionStartIncluding": "5.5"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "18BEDAD6-86F8-457C-952F-C35698B3D07F",
"versionEndExcluding": "5.15.169",
"versionStartIncluding": "5.11"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "10FD2B3E-C7D9-4A9C-BD64-41877EDF88EB",
"versionEndExcluding": "6.1.114",
"versionStartIncluding": "5.16"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6B9489BC-825E-4EEE-8D93-F93C801988C8",
"versionEndExcluding": "6.6.58",
"versionStartIncluding": "6.2"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6E62D61A-F704-44DB-A311-17B7534DA7BC",
"versionEndExcluding": "6.11.5",
"versionStartIncluding": "6.7"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7F361E1D-580F-4A2D-A509-7615F73167A1"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "925478D0-3E3D-4E6F-ACD5-09F28D5DF82C"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "3C95E234-D335-4B6C-96BF-E2CEBD8654ED"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}