CVE-2024-46744
HighSummary
A vulnerability has been identified in the Linux kernel related to the lack of sanity check for symbolic link size in Squashfs. This bug leads to incorrect reading of the link size, resulting in an uninitialized memory page.
Risk Assessment
This vulnerability may lead to unpredictable system behavior, including potential crashes or data leaks. Organizations should be aware of the risks associated with using corrupted symbolic links.
Recommendation
It is recommended to update the Linux kernel to the latest version to patch this vulnerability and to implement additional mechanisms to monitor filesystem integrity.
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Original NVD description (English source)
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 no
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

