cve-2021-47119
Vulnerability from cvelistv5
Published
2024-03-15 20:14
Modified
2024-11-04 11:59
Severity ?
EPSS score ?
Summary
ext4: fix memory leak in ext4_fill_super
References
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"id": "CVE-2021-47119",
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"timestamp": "2024-07-23T13:37:32.763549Z",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix memory leak in ext4_fill_super\n\nBuffer head references must be released before calling kill_bdev();\notherwise the buffer head (and its page referenced by b_data) will not\nbe freed by kill_bdev, and subsequently that bh will be leaked.\n\nIf blocksizes differ, sb_set_blocksize() will kill current buffers and\npage cache by using kill_bdev(). And then super block will be reread\nagain but using correct blocksize this time. sb_set_blocksize() didn\u0027t\nfully free superblock page and buffer head, and being busy, they were\nnot freed and instead leaked.\n\nThis can easily be reproduced by calling an infinite loop of:\n\n systemctl start \u003cext4_on_lvm\u003e.mount, and\n systemctl stop \u003cext4_on_lvm\u003e.mount\n\n... since systemd creates a cgroup for each slice which it mounts, and\nthe bh leak get amplified by a dying memory cgroup that also never\ngets freed, and memory consumption is much more easily noticed."
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"url": "https://git.kernel.org/stable/c/01d349a481f0591230300a9171330136f9159bcd"
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"title": "ext4: fix memory leak in ext4_fill_super",
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"cveId": "CVE-2021-47119",
"datePublished": "2024-03-15T20:14:25.901Z",
"dateReserved": "2024-03-04T18:12:48.838Z",
"dateUpdated": "2024-11-04T11:59:46.566Z",
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"nvd": "{\"cve\":{\"id\":\"CVE-2021-47119\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-15T21:15:07.013\",\"lastModified\":\"2024-03-17T22:38:29.433\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix memory leak in ext4_fill_super\\n\\nBuffer head references must be released before calling kill_bdev();\\notherwise the buffer head (and its page referenced by b_data) will not\\nbe freed by kill_bdev, and subsequently that bh will be leaked.\\n\\nIf blocksizes differ, sb_set_blocksize() will kill current buffers and\\npage cache by using kill_bdev(). And then super block will be reread\\nagain but using correct blocksize this time. sb_set_blocksize() didn\u0027t\\nfully free superblock page and buffer head, and being busy, they were\\nnot freed and instead leaked.\\n\\nThis can easily be reproduced by calling an infinite loop of:\\n\\n systemctl start \u003cext4_on_lvm\u003e.mount, and\\n systemctl stop \u003cext4_on_lvm\u003e.mount\\n\\n... since systemd creates a cgroup for each slice which it mounts, and\\nthe bh leak get amplified by a dying memory cgroup that also never\\ngets freed, and memory consumption is much more easily noticed.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: corrige la p\u00e9rdida de memoria en ext4_fill_super Las referencias del encabezado del b\u00fafer deben liberarse antes de llamar a kill_bdev(); de lo contrario, kill_bdev no liberar\u00e1 el encabezado del b\u00fafer (y su p\u00e1gina a la que hace referencia b_data) y, posteriormente, se filtrar\u00e1 ese bh. Si los tama\u00f1os de los bloques difieren, sb_set_blocksize() eliminar\u00e1 los b\u00faferes actuales y el cach\u00e9 de la p\u00e1gina usando kill_bdev(). Y luego el superbloque se volver\u00e1 a leer, pero esta vez utilizando el tama\u00f1o de bloque correcto. sb_set_blocksize() no liber\u00f3 completamente la p\u00e1gina del superbloque y el encabezado del b\u00fafer y, al estar ocupados, no se liberaron y en su lugar se filtraron. Esto se puede reproducir f\u00e1cilmente llamando a un bucle infinito de: systemctl start .mount, y systemctl stop .mount... ya que systemd crea un cgroup para cada segmento que monta, y la fuga de bh se amplifica con un grupo de memoria moribundo que tampoco se libera nunca, y el consumo de memoria se nota mucho m\u00e1s f\u00e1cilmente.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01d349a481f0591230300a9171330136f9159bcd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1385b23396d511d5233b8b921ac3058b3f86a5e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/afd09b617db3786b6ef3dc43e28fe728cfea84df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.