RDMA/mlx5: Fix undefined shift of user RQ WQE size
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: 5 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/mlx5: Fix undefined shift of user RQ WQE size set_rq_size() computes the RQ WQE size as "1 << rq_wqe_shift" based on the user-provided rq_wqe_shift, which is only checked to be greater than 32, so shifts of 32 are still accepted. A shift of 31 also overflows a signed integer, leading to undefined behavior. Use check_shl_overflow() to compute the RQ WQE size and reject any invalid values.
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 5.10.261, 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: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74297
- 2026-10-03 Alias added: GHSA-p4jx-gh49-76wv
- 2026-10-16 CISA SSVC decision points changed
References
Other 8
- https://git.kernel.org/stable/c/9fff54929cc00849d738faa99f06c32399aeb026
- https://git.kernel.org/stable/c/b746f949c2ac2b041102836095d6d4a2ef21fa75
- https://git.kernel.org/stable/c/c1dbf52d24a8cb1aa56780ba51b72e7d495f258c
- https://git.kernel.org/stable/c/6fc874fdfb366bfb11c62e6af9a831c8be59ddda
- https://git.kernel.org/stable/c/42f3d2c8c18b92ea33e506a38b64f1a8986c2823
- https://git.kernel.org/stable/c/4b87a2497276a72fd63028e7419abf0fb7ed837b
- https://git.kernel.org/stable/c/b732db02a2b04cde393638df19de6251ce62a74e
- https://git.kernel.org/stable/c/d881d60223aac8fdc12b227d89c76e131e92a9cd
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Sources
- CVE-2026-74297 · CVE Program
- CVE-2026-74297 · NVD
- FIRST EPSS
- GHSA-p4jx-gh49-76wv · GitHub Advisory Database · CC BY 4.0
- CVE-2026-74297 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences