Linux Kernel up to 7.3-rc3 RDMA-siw siw_get_hdr out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.00

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 7.3-rc3. Impacted is the function siw_get_hdr of the component RDMA-siw. Performing a manipulation results in out-of-bounds write. This vulnerability is reported as CVE-2026-98323. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been classified as very critical. This affects the function siw_get_hdr of the component RDMA-siw. 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: RDMA/siw: Bound fragmented header copies by the remaining length siw_get_hdr() can receive an extended DDP/RDMAP header across more than one TCP callback. The first callback may receive most of the header, while the next one still limits the copy to hdrlen - MIN_DDP_HDR instead of the number of missing bytes. This makes the destination move past the end of the header and overwrite the receive state, including fpdu_part_rcvd. A later callback can then use a negative fpdu_part_rcvd value as a copy offset, which creates an OOB write. Use the number of header bytes already received when calculating the next copy length.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-98323 since 09/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k 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 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7/af9f5b474a260ad23ffb9793d716a5e3bbce3b48/262dcd809723723ed8a4e05437ec7e9c21a8f17e/eb4d7a946970469b3ab0c762432bf161d5b0836c/8628f8ebf41669302513fb3f0bf0eba38b226742/b72dcfb9bf1f0f0147cda03dc59e4002a315067f/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d/9ff797e516dbc1ecb73701ec4c24055712d44411 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best 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 write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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: 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7/af9f5b474a260ad23ffb9793d716a5e3bbce3b48/262dcd809723723ed8a4e05437ec7e9c21a8f17e/eb4d7a946970469b3ab0c762432bf161d5b0836c/8628f8ebf41669302513fb3f0bf0eba38b226742/b72dcfb9bf1f0f0147cda03dc59e4002a315067f/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d/9ff797e516dbc1ecb73701ec4c24055712d44411

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-2026-98323 (🔒)
GCVE (CVE): GCVE-0-2026-98323
GCVE (VulDB): GCVE-100-414177

Entryinfo

Created: 10/06/2026 13:25
Changes: 10/06/2026 13:25 (59)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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