Linux Kernel up to 7.3-rc3 mmp_pdma mmp_pdma_prep_slave_sg out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.28

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been rated as very critical. Affected by this issue is the function mmp_pdma_prep_slave_sg of the component mmp_pdma. The manipulation leads to out-of-bounds. This vulnerability is traded as CVE-2026-98298. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3 and classified as very critical. This issue affects the function mmp_pdma_prep_slave_sg of the component mmp_pdma. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: dmaengine: mmp_pdma: fix wrong sg length in mmp_pdma_prep_slave_sg() In mmp_pdma_prep_slave_sg(), for_each_sg() iterates the scatterlist putting each entry into 'sg', but the entry length is read from 'sgl' (the list head) instead of 'sg' (the current entry): for_each_sg(sgl, sg, sg_len, i) { addr = sg_dma_address(sg); avail = sg_dma_len(sgl); /* should be 'sg' */ Consequently 'avail' is always the length of the first entry. For multi-sg lists this causes out-of-bounds reads when a later entry is shorter than the first, and silent data loss when it is longer. Single-sg or uniformly-sized lists happen to mask the issue.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-98298 since 09/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/06/2026).

Upgrading to version 5.10.271, 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 f448a5f5bd10d792440a1b08cf2e8f311767032d/2148db529f082d6e3ca95413bf943442f4ef30cc/d920c07aa6d89ec11afdb6976aafaee9563a5234/4a33886057e6d127555efb022879c583e966acc5/88a505330eb06128f7ce79a4c5e4832b7601b3d1/bae65e4925928f77824ca0103122e2ed20ef5802/54ccc01012a240476edf641bf1a2b8bff54fe6ae/075bc7b1d3dde5ed43fbaabbc1a69f09b7fc3a47 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
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
CWE: CWE-125 / CWE-119
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 5.10.271/5.15.222/6.1.189/6.6.158/6.12.112/6.18.54/7.2.8/7.3-rc4
Patch: f448a5f5bd10d792440a1b08cf2e8f311767032d/2148db529f082d6e3ca95413bf943442f4ef30cc/d920c07aa6d89ec11afdb6976aafaee9563a5234/4a33886057e6d127555efb022879c583e966acc5/88a505330eb06128f7ce79a4c5e4832b7601b3d1/bae65e4925928f77824ca0103122e2ed20ef5802/54ccc01012a240476edf641bf1a2b8bff54fe6ae/075bc7b1d3dde5ed43fbaabbc1a69f09b7fc3a47

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-2026-98298 (🔒)
GCVE (CVE): GCVE-0-2026-98298
GCVE (VulDB): GCVE-100-414239

Entryinfo

Created: 10/06/2026 13:56
Changes: 10/06/2026 13:56 (59)
Complete: 🔍
Cache ID: 216::103

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