Linux Kernel up to 7.3-rc3 pmbus/core out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k0.78+

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been classified as very critical. Impacted is an unknown function of the component pmbus/core. Performing a manipulation results in out-of-bounds write. This vulnerability is identified as CVE-2026-98199. The attack is only possible with local access. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 7.3-rc3. This affects an unknown code block of the component pmbus/core. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/core) increase number of phases and add new mask Increase the number of phases to 16 as a new upcoming device supports such a number. While at it, add a new mask for controlling the source of the output voltage. Note (groeck): This patch was meant to prepare for support of MAX20826 and compatible devices, which support more than 10 phases per page. However, Sashiko reports that the mp2975 driver already supports up to 14 phases, and the mp2856 driver supports up to 12 phases. This already has the potential for out-of-bounds writes when probing the affected chips, making this patch a bug fix.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-98199 since 09/25/2026. The exploitability is told to be easy. Attacking locally is a requirement. The exploitation needs additional levels of successful authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/06/2026).

Upgrading to version 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8 or 7.3-rc4 eliminates this vulnerability. Applying the patch 272006a52cbd9c8342cead4d3eb9221ebbe8b985/b32607710a20ad983f9fe4a3051892584c0641a4/66368f682a53f3a3842e20eebb571a59809c52c0/1ec644c94466834f8cb6b7ba12636fd047bdfdda/9558fc1e042ac6b12dd63c37d2c51be4ec86d402/b49f100a15b8876deccf8c59f41af92b8e25fd74/06bd6794b5fd2163880ac3bfe973d4cc61f359f3 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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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

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 5.15.222/6.1.189/6.6.158/6.12.112/6.18.54/7.2.8/7.3-rc4
Patch: 272006a52cbd9c8342cead4d3eb9221ebbe8b985/b32607710a20ad983f9fe4a3051892584c0641a4/66368f682a53f3a3842e20eebb571a59809c52c0/1ec644c94466834f8cb6b7ba12636fd047bdfdda/9558fc1e042ac6b12dd63c37d2c51be4ec86d402/b49f100a15b8876deccf8c59f41af92b8e25fd74/06bd6794b5fd2163880ac3bfe973d4cc61f359f3

Timelineinfo

09/25/2026 CVE reserved
10/06/2026 +11 days Advisory disclosed
10/06/2026 +0 days VulDB entry created
10/06/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98199 (🔒)
GCVE (CVE): GCVE-0-2026-98199
GCVE (VulDB): GCVE-100-414111

Entryinfo

Created: 10/06/2026 12:51
Changes: 10/06/2026 12:51 (58)
Complete: 🔍
Cache ID: 216::103

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