CVE-2026-43120 (GCVE-0-2026-43120)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-08-05 12:26
VLAI
Title
RDMA/irdma: Fix double free related to rereg_user_mr
Summary
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")
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 715fdb3b30541cc8180b7cdc6aa9f8c307afdf25 , < 62298a48f8b8788ad8b8464e6ffdf1ddebd2217e (git)
Affected: 5ac388db27c443dadfbb0b8b23fa7ccf429d901a , < 66964118f1f50ed85001c8fc9f7ab5bbdd021ee0 (git)
Affected: 5ac388db27c443dadfbb0b8b23fa7ccf429d901a , < 0f22c32141acdcda266b26cab2b830baf870f3e0 (git)
Affected: 5ac388db27c443dadfbb0b8b23fa7ccf429d901a , < 0c5d70bcb9d2275a1c8515a924016fcfeb4ab441 (git)
Affected: 5ac388db27c443dadfbb0b8b23fa7ccf429d901a , < 29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2 (git)
Affected: 6.6.120 , < 6.6.136 (semver)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T12:50:09+00:00",
      "cve": "CVE-2026-43120",
      "id": "CVE-2026-43120",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/irdma: Fix double free related to rereg_user_mr",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43120.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-24T02:28:15Z",
      "cve": "CVE-2026-43120",
      "id": "CVE-2026-43120",
      "initial_release_date": "2026-05-07T02:17:59Z",
      "product_status:first_fixed": "24",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "196",
      "product_status:recommended": "268",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43120",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43120.json",
      "version": "17"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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