cve-2024-46744
Vulnerability from cvelistv5
Published
2024-09-18 07:12
Modified
2024-12-19 09:22
Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
Squashfs: sanity check symbolic link size
Syzkiller reports a "KMSAN: uninit-value in pick_link" bug.
This is caused by an uninitialised page, which is ultimately caused
by a corrupted symbolic link size read from disk.
The reason why the corrupted symlink size causes an uninitialised
page is due to the following sequence of events:
1. squashfs_read_inode() is called to read the symbolic
link from disk. This assigns the corrupted value
3875536935 to inode->i_size.
2. Later squashfs_symlink_read_folio() is called, which assigns
this corrupted value to the length variable, which being a
signed int, overflows producing a negative number.
3. The following loop that fills in the page contents checks that
the copied bytes is less than length, which being negative means
the loop is skipped, producing an uninitialised page.
This patch adds a sanity check which checks that the symbolic
link size is not larger than expected.
--
V2: fix spelling mistake.
References
Impacted products
| Vendor | Product | Version | |||||
|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 |
||||
|
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"dateReserved": "2024-09-11T15:12:18.266Z",
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Later squashfs_symlink_read_folio() is called, which assigns\\n this corrupted value to the length variable, which being a\\n signed int, overflows producing a negative number.\\n\\n3. The following loop that fills in the page contents checks that\\n the copied bytes is less than length, which being negative means\\n the loop is skipped, producing an uninitialised page.\\n\\nThis patch adds a sanity check which checks that the symbolic\\nlink size is not larger than expected.\\n\\n--\\n\\nV2: fix spelling mistake.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Squashfs: comprobaci\u00f3n de la integridad del tama\u00f1o del enlace simb\u00f3lico Syzkiller informa de un error \\\"KMSAN: uninit-value in pick_link\\\". Esto se debe a una p\u00e1gina no inicializada, que en \u00faltima instancia se debe a un tama\u00f1o de enlace simb\u00f3lico da\u00f1ado le\u00eddo desde el disco. 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}
}
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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.