🛡️ CVE-2026-43120 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

RDMA/irdma: Fix double free related to rereg_user_mr

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")

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-43120 is recorded against 2 packages.

  • kernel (from 6.13.0 up to 6.19.14)
  • linux-kernel

Timeline and source

Published on 6 May 2026 and last revised on 15 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-43120 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-06
Updated 2026-08-20
Modified 2026-08-15

Affected Packages

Software From version Fixed in
kernel 6.13.0 6.19.14
linux-kernel — —

Similar Threats

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