Linux Kernel up to 6.12.111/6.18.54/7.2.8/7.3-rc4 hugetlb move_hugetlb_page_tables input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k1.26

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.12.111/6.18.54/7.2.8/7.3-rc4. This issue affects the function move_hugetlb_page_tables of the component hugetlb. The manipulation results in input validation. This vulnerability is known as CVE-2026-98373. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.12.111/6.18.54/7.2.8/7.3-rc4. Affected is the function move_hugetlb_page_tables of the component hugetlb. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: preserve mremap address delta when skipping page tables move_hugetlb_page_tables() optimizes mremap() by advancing to the last entry in the page table when the source page table does not exist, either initially or after unsharing a PMD table. The common loop increment then steps to the first entry in the next page table. However, the code advances both the source and destination addresses to the last entries in their respective page tables, which is wrong. The destination address must be advanced only by the same amount as the source address. If the source and destination offsets within their page tables differ, the destination address can be advanced too far, causing follow-up issues. Fix this by advancing the destination address by the source advance distance. With a reproducer, we were able to trigger a kernel panic on x86-64. With this fix in place, we can no longer reproduce the issue.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-98373 since 09/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/07/2026).

Upgrading to version 6.12.112, 6.18.55, 7.2.9 or 7.3-rc5 eliminates this vulnerability. Applying the patch 7a96b0f657c8d799ea5b8e02fc9ec7cca0e6e7ff/850cc4a84b36a0062dcd0391acd2450e20ab0767/480a39b0a12c977ed6e755f3d12a23424c57d11f/9bdad082d44bdcf93716973dcba6be77e8a06e7b is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

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

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.112/6.18.55/7.2.9/7.3-rc5
Patch: 7a96b0f657c8d799ea5b8e02fc9ec7cca0e6e7ff/850cc4a84b36a0062dcd0391acd2450e20ab0767/480a39b0a12c977ed6e755f3d12a23424c57d11f/9bdad082d44bdcf93716973dcba6be77e8a06e7b

Timelineinfo

09/25/2026 CVE reserved
10/07/2026 +12 days Advisory disclosed
10/07/2026 +0 days VulDB entry created
10/07/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98373 (🔒)
GCVE (CVE): GCVE-0-2026-98373
GCVE (VulDB): GCVE-100-414990

Entryinfo

Created: 10/07/2026 15:30
Changes: 10/07/2026 15:30 (59)
Complete: 🔍
Cache ID: 216::103

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