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CVE-2026-68418: RDMA/irdma: Prevent user-triggered null deref on QP create

• Severity: unknown
• 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: 2026-08-10 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Prevent user-triggered null deref on QP create Previously, the user QP creation path would only attempt to populate iwqp->iwpbl if the user-provided req.user_wqe_bufs field was non-zero. The problem is that iwqp->iwpbl is unconditionally dereferenced later on in irdma_setup_virt_qp. While there was a check for iwqp->iwpbl != NULL, this check would only occur if req.user_wqe_bufs was non-zero. The end result is that a user could send a zero user_wqe_bufs value and trigger a null ptr deref. Fix this by unconditionally calling irdma_get_pbl and bailing if it fails, similar to the CQ and SRQ paths.

Affected products

• Linux: 5.14 — fixed in 7.2

How to fix

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

References

• https://git.kernel.org/stable/c/4e75028c000e9560a7ff66a23d7cd872a967ab7e
• https://git.kernel.org/stable/c/728211c815f6eef28dd3df2a5b6297483185aa20
• https://git.kernel.org/stable/c/ad68e0b759f9569f0dfea84f035c91eadb979802
• https://git.kernel.org/stable/c/b9b0889071569d43623c260074e159cd8f26adb1
• https://git.kernel.org/stable/c/d52ff592abfcd56234f266aa245c489f70b1c554
• https://git.kernel.org/stable/c/ec675b4cdfd378d8c9dd8c93126c024f2469bd79

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