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.
References8
- git.kernel.org/stable/c/262dcd809723723ed8a4e05437ec7e9c21a8f17e
- git.kernel.org/stable/c/2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7
- git.kernel.org/stable/c/8628f8ebf41669302513fb3f0bf0eba38b226742
- git.kernel.org/stable/c/9ff797e516dbc1ecb73701ec4c24055712d44411
- git.kernel.org/stable/c/af9f5b474a260ad23ffb9793d716a5e3bbce3b48
- git.kernel.org/stable/c/b72dcfb9bf1f0f0147cda03dc59e4002a315067f
- git.kernel.org/stable/c/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d
- git.kernel.org/stable/c/eb4d7a946970469b3ab0c762432bf161d5b0836c
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 44 · as of 10 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.