CVE-2026-98323

RDMA/siw: Bound fragmented header copies by the remaining length

State: Published
Severity: 9.8 Critical
Published: Oct 6, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	e3917c85f41ef1df64e27dc0e46ab0d803c5e73e to before 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7Affected 308cd50f174c95a507527037f4de1a0396aa4325 to before af9f5b474a260ad23ffb9793d716a5e3bbce3b48Affected 754209850df8367c954ac1de7671c7430b1f342c to before 262dcd809723723ed8a4e05437ec7e9c21a8f17eAffected 754209850df8367c954ac1de7671c7430b1f342c to before eb4d7a946970469b3ab0c762432bf161d5b0836cAffected 754209850df8367c954ac1de7671c7430b1f342c to before 8628f8ebf41669302513fb3f0bf0eba38b226742Affected 754209850df8367c954ac1de7671c7430b1f342c to before b72dcfb9bf1f0f0147cda03dc59e4002a315067fAffected 754209850df8367c954ac1de7671c7430b1f342c to before e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9dAffected 754209850df8367c954ac1de7671c7430b1f342c to before 9ff797e516dbc1ecb73701ec4c24055712d44411Affected e09caa38e10bcf027100cc22b0e3cc745a39ef0aAffected 0c14f795a9eab9344230f9933798b8ee496f497dAffected 7fada7c6962219b6fc4ff4e62e46a936af110dd9Affected 5.10.150 to before 5.10.271Affected 5.15.75 to before 5.15.222Affected 5.4.220 to before 5.5Affected 5.19.17 to before 5.20Affected 6.0.3 to before 6.1Affected
LinuxLinux	6.1Affected before 6.1Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.112 through 6.12.Not affected 6.18.54 through 6.18.Not affected 7.2.8 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

e3917c85f41ef1df64e27dc0e46ab0d803c5e73e to before 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7Affected
308cd50f174c95a507527037f4de1a0396aa4325 to before af9f5b474a260ad23ffb9793d716a5e3bbce3b48Affected
754209850df8367c954ac1de7671c7430b1f342c to before 262dcd809723723ed8a4e05437ec7e9c21a8f17eAffected
754209850df8367c954ac1de7671c7430b1f342c to before eb4d7a946970469b3ab0c762432bf161d5b0836cAffected
754209850df8367c954ac1de7671c7430b1f342c to before 8628f8ebf41669302513fb3f0bf0eba38b226742Affected
754209850df8367c954ac1de7671c7430b1f342c to before b72dcfb9bf1f0f0147cda03dc59e4002a315067fAffected
754209850df8367c954ac1de7671c7430b1f342c to before e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9dAffected
754209850df8367c954ac1de7671c7430b1f342c to before 9ff797e516dbc1ecb73701ec4c24055712d44411Affected
e09caa38e10bcf027100cc22b0e3cc745a39ef0aAffected
0c14f795a9eab9344230f9933798b8ee496f497dAffected
7fada7c6962219b6fc4ff4e62e46a936af110dd9Affected
5.10.150 to before 5.10.271Affected
5.15.75 to before 5.15.222Affected
5.4.220 to before 5.5Affected
5.19.17 to before 5.20Affected
6.0.3 to before 6.1Affected

LinuxLinux

6.1Affected
before 6.1Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.112 through 6.12.*Not affected
6.18.54 through 6.18.*Not affected
7.2.8 through 7.2.*Not affected
7.3 and laterNot affected

References

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