CVE-2026-98323
Published: October 9, 2026Last modified: October 9, 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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.8 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.189-r0) |
| 25 LTS | linux-lts | Fixed (6.12.112-r0) | |
| Stream | linux-lts | Fixed (6.18.55-r0) |
References
- https://git.kernel.org/stable/c/262dcd809723723ed8a4e05437ec7e9c21a8f17e
- https://git.kernel.org/stable/c/2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7
- https://git.kernel.org/stable/c/8628f8ebf41669302513fb3f0bf0eba38b226742
- https://git.kernel.org/stable/c/9ff797e516dbc1ecb73701ec4c24055712d44411
- https://git.kernel.org/stable/c/af9f5b474a260ad23ffb9793d716a5e3bbce3b48
- https://git.kernel.org/stable/c/b72dcfb9bf1f0f0147cda03dc59e4002a315067f
- https://git.kernel.org/stable/c/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d
- https://git.kernel.org/stable/c/eb4d7a946970469b3ab0c762432bf161d5b0836c