CVE-2024-47699
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 6.1.115-1 |
| debian | bullseye | fixed | 5.10.234-1 |
| debian | forky | fixed | 6.11.2-1 |
| debian | sid | fixed | 6.11.2-1 |
| debian | trixie | fixed | 6.11.2-1 |
| linux-kernel | affected | 5.10.227 |
References
- 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://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
- https://www.suse.com/security/cve/CVE-2024-47699.html
- https://security-tracker.debian.org/tracker/CVE-2024-47699
CWEs
CWE-476
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.