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CVE-2022-49076: RDMA/hfi1: Fix use-after-free bug for mm struct

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/hfi1: Fix use-after-free bug for mm struct Under certain conditions, such as MPI_Abort, the hfi1 cleanup code may represent the last reference held on the task mm. hfi1_mmu_rb_unregister() then drops the last reference and the mm is freed before the final use in hfi1_release_user_pages(). A new task may allocate the mm structure while it is still being used, resulting in problems. One manifestation is corruption of the mmap_sem counter leading to a hang in down_write(). Another is corruption of an mm struct that is in use by another task.

Affected products

• Linux kernel: from 5.9.12 before 5.10.111; from 5.11 before 5.15.34; from 5.16 before 5.16.20; from 5.17 before 5.17.3; 5.18-rc1 — fixed in 5.10.111, 5.15.34, 5.16.20, 5.17.3

How to fix

Upgrade to a fixed version: Linux kernel 5.10.111, 5.15.34, 5.16.20, 5.17.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0b7186d657ee55e2cdefae498f07d5c1961e8023
• https://git.kernel.org/stable/c/2bbac98d0930e8161b1957dc0ec99de39ade1b3c
• https://git.kernel.org/stable/c/5a9a1b24ddb510715f8f621263938186579a965c
• https://git.kernel.org/stable/c/5f54364ff6cfcd14cddf5441c4a490bb28dd69f7
• https://git.kernel.org/stable/c/9ca11bd8222a612de0d2f54d050bfcf61ae2883f

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