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CVE-2026-98323

CRITICALCVSS 9.8/10EPSS 0.18%

Last modified

CVE-2026-98323 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.18%

7.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= e3917c85f41ef1df64e27dc0e46ab0d803c5e73e, < 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7; >= 308cd50f174c95a507527037f4de1a0396aa4325, < af9f5b474a260ad23ffb9793d716a5e3bbce3b48; >= 754209850df8367c954ac1de7671c7430b1f342c, < 262dcd809723723ed8a4e05437ec7e9c21a8f17e; >= 754209850df8367c954ac1de7671c7430b1f342c, < eb4d7a946970469b3ab0c762432bf161d5b0836c; >= 754209850df8367c954ac1de7671c7430b1f342c, < 8628f8ebf41669302513fb3f0bf0eba38b226742; >= 754209850df8367c954ac1de7671c7430b1f342c, < b72dcfb9bf1f0f0147cda03dc59e4002a315067f; >= 754209850df8367c954ac1de7671c7430b1f342c, < e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d; >= 754209850df8367c954ac1de7671c7430b1f342c, < 9ff797e516dbc1ecb73701ec4c24055712d44411; e09caa38e10bcf027100cc22b0e3cc745a39ef0a; 0c14f795a9eab9344230f9933798b8ee496f497d; 7fada7c6962219b6fc4ff4e62e46a936af110dd9; >= 5.10.150, < 5.10.271; >= 5.15.75, < 5.15.222; >= 5.4.220, < 5.5; >= 5.19.17, < 5.20; >= 6.0.3, < 6.1
LinuxLinux6.1

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98323?
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.
How severe is CVE-2026-98323?
CVE-2026-98323 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98323?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST