nilfs2: fix potential null-ptr-deref in nilfs_btree_insert()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-47699
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-10-21 12:15:06 UTC
Updated2026-05-12 12:17:13 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 17c76b0104e4a6513983777e1a17e0297a12b0c4 2b78e9df10fb7f4e9d3d7a18417dd72fbbc1dfd0 git Not specified
CNA Linux Linux affected 17c76b0104e4a6513983777e1a17e0297a12b0c4 1d94dbdfbb64cc48d10dec65cc3c4fbf2497b343 git Not specified
CNA Linux Linux affected 17c76b0104e4a6513983777e1a17e0297a12b0c4 24bf40740a3da6b4056721da34997ae6938f3da1 git Not specified
CNA Linux Linux affected 17c76b0104e4a6513983777e1a17e0297a12b0c4 73d23ecf234b7a6d47fb883f2dabe10e3230b31d git Not specified
CNA Linux Linux affected 17c76b0104e4a6513983777e1a17e0297a12b0c4 f68523e0f26faade18833fbef577a4295d8e2c94 git Not specified
CNA Linux Linux affected 17c76b0104e4a6513983777e1a17e0297a12b0c4 21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34 git Not specified
CNA Linux Linux affected 17c76b0104e4a6513983777e1a17e0297a12b0c4 db73500d3f0e558eb642aae1d4782e7726b4a03f git Not specified
CNA Linux Linux affected 17c76b0104e4a6513983777e1a17e0297a12b0c4 3644554d308ddf2669e459a1551a7edf60b2d62b git Not specified
CNA Linux Linux affected 17c76b0104e4a6513983777e1a17e0297a12b0c4 9403001ad65ae4f4c5de368bdda3a0636b51d51a git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 4.19.323 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.285 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.227 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.168 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.113 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.54 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.13 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11.2 6.11.* semver Not specified
CNA Linux Linux unaffected 6.12 * original_commit_for_fix Not specified
ADP Siemens RUGGEDCOM RST2428P unaffected * custom Not specified
ADP Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 Family unaffected * custom Not specified
ADP Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 Family unaffected * custom Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2b78e9df10fb7f4e9d3d7a18417dd72fbbc1dfd0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
lists.debian.org/debian-lts-announce/2025/03/msg00002.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/f68523e0f26faade18833fbef577a4295d8e2c94 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/21839b6fbc3c41b3e374ecbdb0cabbbb2c53cf34 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/73d23ecf234b7a6d47fb883f2dabe10e3230b31d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/24bf40740a3da6b4056721da34997ae6938f3da1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1d94dbdfbb64cc48d10dec65cc3c4fbf2497b343 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3644554d308ddf2669e459a1551a7edf60b2d62b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-355557.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/9403001ad65ae4f4c5de368bdda3a0636b51d51a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/db73500d3f0e558eb642aae1d4782e7726b4a03f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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