CVE-2026-43120High· 7.8▾ TwilightIn 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 ird…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
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")
Linux >= 715fdb3b30541cc8180b7cdc6aa9f8c307afdf25 < 62298a48f8b8788ad8b8464e6ffdf1ddebd2217eLinux >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a < 66964118f1f50ed85001c8fc9f7ab5bbdd021ee0Linux >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a < 0f22c32141acdcda266b26cab2b830baf870f3e0Linux >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a < 0c5d70bcb9d2275a1c8515a924016fcfeb4ab441Linux >= 5ac388db27c443dadfbb0b8b23fa7ccf429d901a < 29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2Linux >= 6.6.120 < 6.6.136Linux 6.7Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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