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THREATINT
PUBLISHED

CVE-2024-26982

Squashfs: check the inode number is not the invalid value of zero

Reserved:2024-02-19
Published:2024-05-01
Updated:2024-05-13

Description

In the Linux kernel, the following vulnerability has been resolved: Squashfs: check the inode number is not the invalid value of zero Syskiller has produced an out of bounds access in fill_meta_index(). That out of bounds access is ultimately caused because the inode has an inode number with the invalid value of zero, which was not checked. The reason this causes the out of bounds access is due to following sequence of events: 1. Fill_meta_index() is called to allocate (via empty_meta_index()) and fill a metadata index. It however suffers a data read error and aborts, invalidating the newly returned empty metadata index. It does this by setting the inode number of the index to zero, which means unused (zero is not a valid inode number). 2. When fill_meta_index() is subsequently called again on another read operation, locate_meta_index() returns the previous index because it matches the inode number of 0. Because this index has been returned it is expected to have been filled, and because it hasn't been, an out of bounds access is performed. This patch adds a sanity check which checks that the inode number is not zero when the inode is created and returns -EINVAL if it is. [phillip@squashfs.org.uk: whitespace fix] Link: https://lkml.kernel.org/r/20240409204723.446925-1-phillip@squashfs.org.uk

Product status

Default status
unaffected

1da177e4c3f4 before be383effaee3
affected

1da177e4c3f4 before 7def00ebc9f2
affected

1da177e4c3f4 before 9253c54e01b6
affected

Default status
affected

6.6.30
unaffected

6.8.8
unaffected

6.9
unaffected

References

https://git.kernel.org/stable/c/be383effaee3d89034f0828038f95065b518772e

https://git.kernel.org/stable/c/7def00ebc9f2d6a581ddf46ce4541f84a10680e5

https://git.kernel.org/stable/c/9253c54e01b6505d348afbc02abaa4d9f8a01395

cve.org CVE-2024-26982

nvd.nist.gov CVE-2024-26982

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