What’s Vulnerable › Vulnerabilities

CVE-2026-74297: RDMA/mlx5: Fix undefined shift of user RQ WQE size

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-16

Description

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.

Affected products

• Linux kernel: 3.11 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/42f3d2c8c18b92ea33e506a38b64f1a8986c2823
• https://git.kernel.org/stable/c/4b87a2497276a72fd63028e7419abf0fb7ed837b
• https://git.kernel.org/stable/c/6fc874fdfb366bfb11c62e6af9a831c8be59ddda
• https://git.kernel.org/stable/c/9fff54929cc00849d738faa99f06c32399aeb026
• https://git.kernel.org/stable/c/b732db02a2b04cde393638df19de6251ce62a74e
• https://git.kernel.org/stable/c/b746f949c2ac2b041102836095d6d4a2ef21fa75
• https://git.kernel.org/stable/c/c1dbf52d24a8cb1aa56780ba51b72e7d495f258c
• https://git.kernel.org/stable/c/d881d60223aac8fdc12b227d89c76e131e92a9cd

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