CVE-2026-64268
CVE-2026-64268: 1 tracked advisory record across Red Hat. Compare source-reported impact, fixes and remediation.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityHigh8.8
High [CVE-2026-64268] Remote out-of-bounds write in RDMA/siw
CVE-2026-64268Source published Source updated
In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: bound Read Response placement to the RREAD length In drivers/infiniband/sw/siw/siw_qp_rx.c, siw_proc_rresp() places each inbound Read Response DDP segment at sge->laddr + wqe->processed and then accumulates wqe->processed, but it never checks the running total against the sink buffer length on continuation segments. siw_check_sge() resolves and validates the sink memory only on the first fragment (the if (!*mem) branch), and siw_rresp_check_ntoh() compares the cumulative length against wqe->bytes only on the final segment (the!frx->more_ddp_segs guard). A connected siw peer that answers an outstanding RREAD with Read Response segments that keep the DDP Last flag clear, carrying more total payload than the RREAD…
- Affected products in this advisory
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat package: kernel-rt
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- kernel-rt-0:4.18.0-553.159.1.rt7.500.el8_10
- kernel-0:4.18.0-553.159.1.el8_10
- kernel-0:5.14.0-687.44.1.el9_8
- RHSA-2026:63013
2 more entries in the full advisory.
- Mitigation guidance
- To mitigate this issue, prevent the `siw` kernel module from loading. Create a file `/etc/modprobe.d/blacklist-siw.conf` with the following content: ``` blacklist siw install siw /bin/true ``` After creating the file, regenerate the initramfs and reboot the system for the changes to take effect: ```bash dracut -f -v reboot ``` This mitigation will disable the Soft iWARP functionality, which may impact applications relying on it. A system reboot is required for the changes to be fully applied.
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