CVE-2026-43128High· 7.8▾ TwilightIn 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, th…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
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).
Linux >= 1e4df4a21c5ac722df1099eee30cad9246c889b5 < 70542b69abff34d24b11ae0bb200cc7a766d18dfLinux >= 1e4df4a21c5ac722df1099eee30cad9246c889b5 < b324327ff6f48d8065dca67eb3b91357e72726bdLinux >= 1e4df4a21c5ac722df1099eee30cad9246c889b5 < ba3bf0f1bf1d5d0404678485e872980532fcc2c4Linux >= 1e4df4a21c5ac722df1099eee30cad9246c889b5 < d3e32e2f3262f1b25d77c085ace38e2cc4ad75cfLinux >= 1e4df4a21c5ac722df1099eee30cad9246c889b5 < 40126bcbefa79ea86672e05dae608596bab38319Linux >= 1e4df4a21c5ac722df1099eee30cad9246c889b5 < 104016eb671e19709721c1b0048dd912dc2e96beLinux 5.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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