CVE-2026-43128

Local kernel memory corruption via double unpin

Published May 6, 2026 · Updated May 6, 2026

Double free in the Linux Kernel RDMA/umem path allows local users to corrupt kernel memory after a dma-buf page-map failure. ib_umem_dmabuf_get_pinned_with_dma_device() immediately unpins the dma-buf when ib_umem_dmabuf_map_pages() fails but leaves the pinned flag set, so ib_umem_release() reaches ib_umem_dmabuf_revoke() and unpins it again. Low-privileged local access and a failed RDMA dma-buf page mapping are required; the published record does not specify whether exploitation ends in a crash or code execution.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in the Linux Kernel RDMA/umem path allows local users to corrupt kernel memory after a dma-buf page-map failure. ib_umem_dmabuf_get_pinned_with_dma_device() immediately unpins the dma-buf when ib_umem_dmabuf_map_pages() fails but leaves the pinned flag set, so ib_umem_release() reaches ib_umem_dmabuf_revoke() and unpins it again. Low-privileged local access and a failed RDMA dma-buf page mapping are required; the published record does not specify whether exploitation ends in a crash or code execution.

The record

CVE
CVE-2026-43128
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-415, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1e4df4a21c5ac722df1099eee30cad9246c889b5 <104016eb671e19709721c1b0048dd912dc2e96be
  2. Affected versionversion=1e4df4a21c5ac722df1099eee30cad9246c889b5 <40126bcbefa79ea86672e05dae608596bab38319
  3. Affected versionversion=1e4df4a21c5ac722df1099eee30cad9246c889b5 <70542b69abff34d24b11ae0bb200cc7a766d18df
  4. Affected versionversion=1e4df4a21c5ac722df1099eee30cad9246c889b5 <b324327ff6f48d8065dca67eb3b91357e72726bd
  5. Affected versionversion=1e4df4a21c5ac722df1099eee30cad9246c889b5 <ba3bf0f1bf1d5d0404678485e872980532fcc2c4
  6. Affected versionversion=1e4df4a21c5ac722df1099eee30cad9246c889b5 <d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf
  7. Affected versionversion=5.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1e4df4a21c5ac722df1099eee30cad9246c889b5 <104016eb671e19709721c1b0048dd912dc2e96be; version=1e4df4a21c5ac722df1099eee30cad9246c889b5 <40126bcbefa79ea86672e05dae608596bab38319; version=1e4df4a21c5ac722df1099eee30cad9246c889b5 <70542b69abff34d24b11ae0bb200cc7a766d18df; version=1e4df4a21c5ac722df1099eee30cad9246c889b5 <b324327ff6f48d8065dca67eb3b91357e72726bd; version=1e4df4a21c5ac722df1099eee30cad9246c889b5 <ba3bf0f1bf1d5d0404678485e872980532fcc2c4; version=1e4df4a21c5ac722df1099eee30cad9246c889b5 <d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf; version=5.16

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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