CVE-2024-47699: nilfs2: fix potential null-ptr-deref in nilfs_btree_insert()
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential null-ptr-deref in nilfs_btree_insert() Patch series "nilfs2: fix potential issues with empty b-tree nodes". This series addresses three potential issues with empty b-tree nodes that can occur with corrupted filesystem images, including one recently discovered by syzbot. This patch (of 3): If a b-tree is broken on the device, and the b-tree height is greater than 2 (the level of the root node is greater than 1) even if the number of child nodes of the b-tree root is 0, a NULL pointer dereference occurs in nilfs_btree_prepare_insert(), which is called from nilfs_btree_insert(). This is because, when the number of child nodes of the b-tree root is 0, nilfs_btree_do_lookup() does not set the block buffer head in any of path[x].bp_bh, leaving it as the initial value of NULL, but if the level of the b-tree root node is greater than 1, nilfs_btree_get_nonroot_node(), which accesses the buffer memory of path[x].bp_bh, is called. Fix this issue by adding a check to nilfs_btree_root_broken(), which performs sanity checks when reading the root node from the device, to detect this inconsistency. Thanks to Lizhi Xu for trying to solve the bug and clarifying the cause early on.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=2.6.30<5.10.227 | |
| Linux Kernel | >=5.11<5.15.168 | |
| Linux Kernel | >=5.16<6.1.113 | |
| Linux Kernel | >=6.2<6.6.54 | |
| Linux Kernel | >=6.7<6.10.13 | |
| Linux Kernel | >=6.11<6.11.2 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/1d94dbdfbb64cc48d10dec65cc3c4fbf2497b343
- https://git.kernel.org/stable/c/21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34
- https://git.kernel.org/stable/c/24bf40740a3da6b4056721da34997ae6938f3da1
- https://git.kernel.org/stable/c/2b78e9df10fb7f4e9d3d7a18417dd72fbbc1dfd0
- https://git.kernel.org/stable/c/3644554d308ddf2669e459a1551a7edf60b2d62b
- https://git.kernel.org/stable/c/73d23ecf234b7a6d47fb883f2dabe10e3230b31d
- https://git.kernel.org/stable/c/9403001ad65ae4f4c5de368bdda3a0636b51d51a
- https://git.kernel.org/stable/c/db73500d3f0e558eb642aae1d4782e7726b4a03f
- https://git.kernel.org/stable/c/f68523e0f26faade18833fbef577a4295d8e2c94
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-47699
- https://nvd.nist.gov/vuln/detail/CVE-2024-47699
- https://launchpad.net/bugs/cve/CVE-2024-47699
- https://security-tracker.debian.org/tracker/CVE-2024-47699
- https://ubuntu.com/security/CVE-2024-47699
- https://git.kernel.org/linus/9403001ad65ae4f4c5de368bdda3a0636b51d51a
Frequently Asked Questions
What is the severity of CVE-2024-47699?
CVE-2024-47699 has been rated with a severity that could lead to potential null pointer dereference in the Linux kernel.
How do I fix CVE-2024-47699?
To fix CVE-2024-47699, update your Linux kernel to a version that incorporates the applied patches, particularly versions 6.1.123-1, 6.1.119-1, 6.12.11-1, or 6.12.12-1.
Which Linux kernel versions are affected by CVE-2024-47699?
CVE-2024-47699 affects Linux kernel versions from 2.6.30 up to 5.10.227, as well as various versions between 5.11 to 6.11.2.
Is there a risk of exploitation for CVE-2024-47699?
Yes, CVE-2024-47699 poses a risk of exploitation due to null pointer dereference vulnerabilities in nilfs2 b-trees.
What mitigation steps should be taken for CVE-2024-47699?
To mitigate the risks associated with CVE-2024-47699, apply the latest kernel security updates and patches immediately.
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