CVE-2024-41013: xfs: don't walk off the end of a directory data block
First published: Mon Jul 29 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: xfs: don't walk off the end of a directory data block This adds sanity checks for xfs_dir2_data_unused and xfs_dir2_data_entry to make sure don't stray beyond valid memory region. Before patching, the loop simply checks that the start offset of the dup and dep is within the range. So in a crafted image, if last entry is xfs_dir2_data_unused, we can change dup->length to dup->length-1 and leave 1 byte of space. In the next traversal, this space will be considered as dup or dep. We may encounter an out of bound read when accessing the fixed members. In the patch, we make sure that the remaining bytes large enough to hold an unused entry before accessing xfs_dir2_data_unused and xfs_dir2_data_unused is XFS_DIR2_DATA_ALIGN byte aligned. We also make sure that the remaining bytes large enough to hold a dirent with a single-byte name before accessing xfs_dir2_data_entry.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.11 | 6.11 |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2300853
- https://access.redhat.com/errata/RHSA-2024:7001
- https://access.redhat.com/errata/RHSA-2024:7000
- https://access.redhat.com/errata/RHSA-2024:8617
- https://bugzilla.redhat.com/show_bug.cgi?id=2300296
- https://git.kernel.org/stable/c/ca96d83c93071f95cf962ce92406621a472df31b
- https://git.kernel.org/stable/c/0c7fcdb6d06cdf8b19b57c17605215b06afa864a
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2024-41013?
CVE-2024-41013 is classified as a high severity vulnerability due to its potential impact on the Linux kernel's xfs filesystem.
How do I fix CVE-2024-41013?
To fix CVE-2024-41013, update the Linux kernel to version 6.11 or later as per the provided remedies.
What systems are affected by CVE-2024-41013?
CVE-2024-41013 affects systems running vulnerable versions of the Linux kernel prior to 6.11.
What type of vulnerability is CVE-2024-41013?
CVE-2024-41013 is a memory management vulnerability specifically affecting directory data blocks in the xfs filesystem.
What happens if CVE-2024-41013 is exploited?
Exploitation of CVE-2024-41013 could lead to unexpected behavior or crashes in systems using the xfs filesystem.
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