Linux Kernel up to 7.1.4 ocfs2 ocfs2_trim_mainbm s_blocksize allocation of resources

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3.8	$0-$5k	0.00+

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 7.1.4. The affected element is the function ocfs2_trim_mainbm of the component ocfs2. Such manipulation of the argument s_blocksize leads to allocation of resources. This vulnerability is listed as CVE-2026-74349. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.4 and classified as problematic. Affected by this issue is the function ocfs2_trim_mainbm of the component ocfs2. The manipulation of the argument s_blocksize with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ocfs2: reject FITRIM ranges shorter than a cluster ocfs2_trim_mainbm() trims the global bitmap in cluster units, but its too-short range validation only checks sb->s_blocksize. On filesystems with a cluster size larger than the block size, a FITRIM range that is at least one block but shorter than one cluster is accepted and shifted down to len == 0. The later start + len - 1 and len -= ... arithmetic then underflows and can drive trimming past the requested range. Reject ranges shorter than s_clustersize instead. That preserves the existing -EINVAL behavior for requests that cannot discard even one allocation unit and keeps zero-cluster trims out of the group walk.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-74349 since 08/15/2026. The exploitation is known to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

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 d903d59c0315f59bdf0214b4f13d71c9feb2c45c/441abb77222f155e8d931dbabb465466db01cfd7/e652d0f5108e447b22da4249bcd23dd1b63c73dd/346314bb0cc2fc52b50b73d6ecc62e0217455c2e/06c0a0431b9856506fcd9b2c1b0c6136567d756d/3fa7139b5f42731a61f78c42433adae13f9adc21/2c13e02592b918be7725ab5965e01ef4e46c4b57/ca1afd88f5eaaff9168e1466e5401385edf59543 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
• 6.12.4
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• 6.12.89
• 6.12.90
• 6.12.91
• 6.12.92
• 6.12.93
• 6.12.94
• 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
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
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• 6.18.33
• 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: 3.9
VulDB Meta Temp Score: 3.8

VulDB Base Score: 3.9
VulDB Temp Score: 3.8
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: Partially
Local: Yes
Remote: Partially

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

0-Day	Unlock	Unlock	Unlock	Unlock
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: d903d59c0315f59bdf0214b4f13d71c9feb2c45c/441abb77222f155e8d931dbabb465466db01cfd7/e652d0f5108e447b22da4249bcd23dd1b63c73dd/346314bb0cc2fc52b50b73d6ecc62e0217455c2e/06c0a0431b9856506fcd9b2c1b0c6136567d756d/3fa7139b5f42731a61f78c42433adae13f9adc21/2c13e02592b918be7725ab5965e01ef4e46c4b57/ca1afd88f5eaaff9168e1466e5401385edf59543

Timelineinfo

08/15/2026 Advisory disclosed
08/15/2026 +0 days CVE reserved
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-2026-74349 (🔒)
GCVE (CVE): GCVE-0-2026-74349
GCVE (VulDB): GCVE-100-390308

Entryinfo

Created: 08/15/2026 09:44
Changes: 08/15/2026 09:44 (60)
Complete: 🔍
Cache ID: 216::103

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Discussion

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