CVE-2026-43128

HighCVSS 7.8/10Last modified Nov 11, 2026

Description

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).

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-415

Affected software

VendorProductVersions
LinuxLinux>= 1e4df4a21c5ac722df1099eee30cad9246c889b5, < 70542b69abff34d24b11ae0bb200cc7a766d18df; >= 1e4df4a21c5ac722df1099eee30cad9246c889b5, < b324327ff6f48d8065dca67eb3b91357e72726bd; >= 1e4df4a21c5ac722df1099eee30cad9246c889b5, < ba3bf0f1bf1d5d0404678485e872980532fcc2c4; >= 1e4df4a21c5ac722df1099eee30cad9246c889b5, < d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf; >= 1e4df4a21c5ac722df1099eee30cad9246c889b5, < 40126bcbefa79ea86672e05dae608596bab38319; >= 1e4df4a21c5ac722df1099eee30cad9246c889b5, < 104016eb671e19709721c1b0048dd912dc2e96be
LinuxLinux5.16

References

Timeline

Published
May 6, 2026
Last modified
Nov 11, 2026
NVD status
Modified

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CVE-2026-43128: High severity, CVSS 7.8 | Vulnix