Linux Kernel up to 7.1.4 ocfs2 ocfs2_dir_foreach_blk_el Pos allocation of resources

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4.3	$0-$5k	0.00+

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.1.4. It has been declared as problematic. This issue affects the function ocfs2_dir_foreach_blk_el of the component ocfs2. Executing a manipulation of the argument Pos can lead to allocation of resources. This vulnerability is tracked as CVE-2026-72159. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in Linux Kernel up to 7.1.4. This vulnerability affects the function ocfs2_dir_foreach_blk_el of the component ocfs2. The manipulation of the argument pos with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ocfs2: reject non-inline dinodes with i_size and zero i_clusters On a volume mounted without OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC, a non-inline regular file with non-zero i_size and zero i_clusters is structurally malformed: the extent map declares no allocated clusters yet the size header claims content exists. Keep rejecting that shape, but express it through a shared predicate so the same invariant is available to normal inode reads and online filecheck. The same zero-cluster shape is also malformed for non-inline directories. ocfs2 directory growth allocates backing storage before advancing i_size, and ocfs2_dir_foreach_blk_el() later walks until ctx->pos reaches i_size_read(inode). A forged directory dinode with a huge i_size and no clusters would repeatedly fail on holes while advancing through the claimed size. Sparse regular files remain exempt: on sparse-alloc volumes, truncate can legitimately grow i_size without allocating clusters. System inodes and inline-data dinodes also retain their separate storage rules. Mirror the check in ocfs2_filecheck_validate_inode_block() as well. filecheck reports through its own error namespace, so malformed size/cluster state is logged as a filecheck invalid-inode result rather than via ocfs2_error(), but it must not proceed into ocfs2_populate_inode().

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-72159 since 08/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc1 eliminates this vulnerability. Applying the patch 416d3e5f8a30ed04fe21ba7dc73c2841c3b56265/ed0f938f946f16b772e99cb8c277ab57828e5be4/83f6756a7b71adec0a41ae68e079a38906d59c6c/38c1ef7ce50eb4af0f89038b8aba12396ddb9233/d837068eefbc2651fe5789bf75a0f945710f7b8e/2174c68f623b74bd8690a4a6a4a52882d8ac3dc3/3bfeb436d4be6a2beb56cab344770e93e6b07260/7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.10.260
• 5.15.211
• 6.1.177
• 6.6.144
• 6.12.0
• 6.12.1
• 6.12.2
• 6.12.3
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• 6.12.95
• 6.12.96
• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
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• 6.18.34
• 6.18.35
• 6.18.36
• 6.18.37
• 6.18.38
• 6.18.39
• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.3

VulDB Base Score: 4.5
VulDB Temp Score: 4.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.261/5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc1
Patch: 416d3e5f8a30ed04fe21ba7dc73c2841c3b56265/ed0f938f946f16b772e99cb8c277ab57828e5be4/83f6756a7b71adec0a41ae68e079a38906d59c6c/38c1ef7ce50eb4af0f89038b8aba12396ddb9233/d837068eefbc2651fe5789bf75a0f945710f7b8e/2174c68f623b74bd8690a4a6a4a52882d8ac3dc3/3bfeb436d4be6a2beb56cab344770e93e6b07260/7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72159 (🔒)
GCVE (CVE): GCVE-0-2026-72159
GCVE (VulDB): GCVE-100-390592

Entryinfo

Created: 08/15/2026 13:07
Changes: 08/15/2026 13:07 (60)
Complete: 🔍
Cache ID: 216::103

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