CVE-2021-47119
Vulnerability from cvelistv5
Published
2024-03-15 20:14
Modified
2024-12-19 07:35
Severity ?
EPSS score ?
Summary
ext4: fix memory leak in ext4_fill_super
References
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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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"dateReserved": "2024-03-04T18:12:48.838Z",
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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. 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- 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.
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- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
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