CVE-2024-42304High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: ext4: make sure the first directory block is not a hole The syzbot constructs a directory that has no dirblock but is non-inline, i.e. the first directory block is a h…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
ext4: make sure the first directory block is not a hole
The syzbot constructs a directory that has no dirblock but is non-inline, i.e. the first directory block is a hole. And no errors are reported when creating files in this directory in the following flow.
ext4_mknod
...
ext4_add_entry
// Read block 0
ext4_read_dirblock(dir, block, DIRENT)
bh = ext4_bread(NULL, inode, block, 0)
if (!bh && (type == INDEX || type == DIRENT_HTREE))
// The first directory block is a hole
// But type == DIRENT, so no error is reported.
After that, we get a directory block without '.' and '..' but with a valid dentry. This may cause some code that relies on dot or dotdot (such as make_indexed_dir()) to crash.
Therefore when ext4_read_dirblock() finds that the first directory block is a hole report that the filesystem is corrupted and return an error to avoid loading corrupted data from disk causing something bad.
linux_kernel >= 4.9.187, < 4.10linux_kernel >= 4.14.135, < 4.15linux_kernel >= 4.19.62, < 4.19.320linux_kernel >= 5.1.21, < 5.2linux_kernel >= 5.2.4, < 5.4.282linux_kernel >= 5.5, < 5.10.224linux_kernel >= 5.11, < 5.15.165linux_kernel >= 5.16, < 6.1.103linux_kernel >= 6.2, < 6.6.44linux_kernel >= 6.7, < 6.10.3Upgrade past the affected range:
linux_kernel 6.10.3Connected by shared product, vendor, weakness, or advisory.
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