High 7.8Published May 6, 2026

CVE-2026-43120RDMA/irdma: Fix double free related to rereg_user_mr

Updated under an hour ago (2026-10-19 06:30 UTC)

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Exploited in the last 30 days

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")

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 715fdb3b30541cc8180b7cdc6aa9f8c307afdf25 before 62298a48f8b8788ad8b8464e6ffdf1ddebd2217e; from 5ac388db27c443dadfbb0b8b23fa7ccf429d901a before 66964118f1f50ed85001c8fc9f7ab5bbdd021ee0; 5ac388db27c443dadfbb0b8b23fa7ccf429d901a builds before 0f22c32141acdcda266b26cab2b830baf870f3e0; 5ac388db27c443dadfbb0b8b23fa7ccf429d901a builds before 0c5d70bcb9d2275a1c8515a924016fcfeb4ab441; from 5ac388db27c443dadfbb0b8b23fa7ccf429d901a before 29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2; from 6.6.120 before 6.6.136	CNA record
linux linux_kernel linux:linux_kernel	from 6.6.120 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; 7.0; 7.0; 7.0; 7.0; and 1 more ranges	NVD

References

https://git.kernel.org/stable/c/62298a48f8b8788ad8b8464e6ffdf1ddebd2217epatch
https://git.kernel.org/stable/c/66964118f1f50ed85001c8fc9f7ab5bbdd021ee0patch
https://git.kernel.org/stable/c/0f22c32141acdcda266b26cab2b830baf870f3e0patch
https://git.kernel.org/stable/c/0c5d70bcb9d2275a1c8515a924016fcfeb4ab441patch
https://git.kernel.org/stable/c/29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.