RDMA/irdma: Fix out-of-bounds write in irdma_copy_user_pgaddrs
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Fix out-of-bounds write in irdma_copy_user_pgaddrs The irdma_copy_user_pgaddrs function loops through all of the umem DMA blocks to populate the PBLEs and will stop when either the last DMA block is reached or palloc->total_cnt is reached. The issue is that the logic for checking palloc->total_cnt would only work for non-zero values. When irdma_setup_pbles is called with lvl==0, it calls irdma_copy_user_pgaddrs with palloc->total_cnt==0, which means the only way to break out of the loop is to reach the last umem DMA block, which means it could end up going beyond the fixed size of 4 iwmr->pgaddrmem array that is used in the lvl==0 case. In the case of QP/CQ/SRQ rings, the value of lvl is determined by a separate input (for example, req.cq_pages in the case of a CQ). So, we must perform explicit checking to ensure we don't overflow the pgaddrmem array if the user provides a umem that consists of more blocks than their provided req.cq_pages.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74390
- 2026-10-03 Alias added: GHSA-c23v-2w7h-h6m9
- 2026-10-18 CISA SSVC decision points changed
References
Other 7
- https://git.kernel.org/stable/c/4780f58672ee6328accd54a95f9c00683477e499
- https://git.kernel.org/stable/c/79a20a8e201a779224b4bf115250a7713bde72c0
- https://git.kernel.org/stable/c/9f8f0d2099e3de1194e37dc933ae0c4206b09aaf
- https://git.kernel.org/stable/c/192a3be0e3759daa24af2841208b074ca6dbaabc
- https://git.kernel.org/stable/c/424d51d33c7541a86934067c2c0538124687fc90
- https://git.kernel.org/stable/c/abd27a977b419d584efa659488c22d2306987b29
- https://git.kernel.org/stable/c/5ebb3ed757be3e04cf803026004aa0beaeb13e9b
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Sources
- CVE-2026-74390 · CVE Program
- CVE-2026-74390 · NVD
- FIRST EPSS
- GHSA-c23v-2w7h-h6m9 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-74390 · Red Hat security data · CC BY 4.0
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