PT-2026-37430 · Linux · Linux Kernel

Published 2026-05-06 · Updated 2026-05-06 · CVE-2026-43120

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A double free issue exists in the RDMA/irdma component. When IB MR REREG TRANS is set during rereg user mr, the system releases the current umem and allocates a new one via irdma rereg mr trans. If a failure occurs after the new umem allocation, the system releases the umem but fails to set the region variable in iwmr to NULL. Consequently, when a user calls ibv dereg mr to handle the failure, the deregistration path detects a non-NULL umem and attempts to call ib umem release a second time.

Recommendations Set iwmr->region to NULL after calling ib umem release to prevent the double free.

Fix

Related Identifiers

CVE-2026-43120

Affected Products

Linux Kernel

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-43120 · Security Note
• https://git.kernel.org/stable/c/0c5d70bcb9d2275a1c8515a924016fcfeb4ab441 · Note
• https://t.me/CVEtracker/52843 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2051984830057849247 · Twitter Post
• https://git.kernel.org/stable/c/62298a48f8b8788ad8b8464e6ffdf1ddebd2217e · Note
• https://git.kernel.org/stable/c/0f22c32141acdcda266b26cab2b830baf870f3e0 · Note
• https://git.kernel.org/stable/c/66964118f1f50ed85001c8fc9f7ab5bbdd021ee0 · Note
• https://git.kernel.org/stable/c/29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2 · Note