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🛡️ CVE-2026-43128 — kernel

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

Description

RDMA/umem: Fix double dma_buf_unpin in failure path

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

RDMA/umem: Fix double dma_buf_unpin in failure path

In ib_umem_dmabuf_get_pinned_with_dma_device(), the call to

ib_umem_dmabuf_map_pages() can fail. If this occurs, the dmabuf

is immediately unpinned but the umem_dmabuf->pinned flag is still

set. Then, when ib_umem_release() is called, it calls

ib_umem_dmabuf_revoke() which will call dma_buf_unpin() again.

Fix this by removing the immediate unpin upon failure and just let

the ib_umem_release/revoke path handle it. This also ensures the

proper unmap-unpin unwind ordering if the dmabuf_map_pages call

happened to fail due to dma_resv_wait_timeout (and therefore has

a non-NULL umem_dmabuf->sgt).

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-2026-43128 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.6)
  • linux-kernel

Timeline and source

Published on 6 May 2026 and last revised on 12 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)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-43128 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 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.6
linux-kernel — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.