CVE-2026-43120

HighCVSS 7.8/10Last modified Oct 19, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/irdma: Fix double free related to rereg_user_mr

If IB_MR_REREG_TRANS is set during rereg_user_mr, the umem will be released and a new one will be allocated in irdma_rereg_mr_trans. If any step of irdma_rereg_mr_trans fails after the new umem is allocated, it releases the umem, but does not set iwmr->region to NULL. The problem is that this failure is propagated to the user, who will then call ibv_dereg_mr (as they should). Then, the dereg_mr path will see a non-NULL umem and attempt to call ib_umem_release again.

Fix this by setting iwmr->region to NULL after ib_umem_release.

Fixed: 5ac388db27c4 ("RDMA/irdma: Add support to re-register a memory region")

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-415

Affected software

VendorProductVersions
LinuxLinux>= 715fdb3b30541cc8180b7cdc6aa9f8c307afdf25, < 62298a48f8b8788ad8b8464e6ffdf1ddebd2217e; >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a, < 66964118f1f50ed85001c8fc9f7ab5bbdd021ee0; >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a, < 0f22c32141acdcda266b26cab2b830baf870f3e0; >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a, < 0c5d70bcb9d2275a1c8515a924016fcfeb4ab441; >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a, < 29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2; >= 6.6.120, < 6.6.136
LinuxLinux6.7

References

Timeline

Published
May 6, 2026
Last modified
Oct 19, 2026
NVD status
Modified

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CVE-2026-43120: High severity, CVSS 7.8 | Vulnix