CVE-2024-47699

MEDIUM EPSS 17.4%
Published Oct 21, 20241y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
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Published Oct 21, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
17.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥2.6.30  –  <5.10.227
linuxlinux_kernel*≥5.11  –  <5.15.168
linuxlinux_kernel*≥5.16  –  <6.1.113
linuxlinux_kernel*≥6.2  –  <6.6.54
linuxlinux_kernel*≥6.7  –  <6.10.13
linuxlinux_kernel*≥6.11  –  <6.11.2

References 13

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-265688.html
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-355557.html
  • git.kernel.org https://git.kernel.org/stable/c/1d94dbdfbb64cc48d10dec65cc3c4fbf2497b343
  • git.kernel.org https://git.kernel.org/stable/c/21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/24bf40740a3da6b4056721da34997ae6938f3da1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2b78e9df10fb7f4e9d3d7a18417dd72fbbc1dfd0
  • git.kernel.org https://git.kernel.org/stable/c/3644554d308ddf2669e459a1551a7edf60b2d62b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/73d23ecf234b7a6d47fb883f2dabe10e3230b31d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9403001ad65ae4f4c5de368bdda3a0636b51d51a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/db73500d3f0e558eb642aae1d4782e7726b4a03f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f68523e0f26faade18833fbef577a4295d8e2c94
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/24bf40740a3da6b4056721da34997ae6938f3da1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3644554d308ddf2669e459a1551a7edf60b2d62b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/73d23ecf234b7a6d47fb883f2dabe10e3230b31d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9403001ad65ae4f4c5de368bdda3a0636b51d51a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/db73500d3f0e558eb642aae1d4782e7726b4a03f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f68523e0f26faade18833fbef577a4295d8e2c94
    Patch