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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-43128

RDMA/umem: Fix double dma_buf_unpin in failure path

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Status
Published
Published
Updated
Assigning organization
Linux

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).

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1e4df4a21c5ac722df1099eee30cad9246c889b5 to < 70542b69abff34d24b11ae0bb200cc7a766d18dfaffected
  • 1e4df4a21c5ac722df1099eee30cad9246c889b5 to < b324327ff6f48d8065dca67eb3b91357e72726bdaffected
  • 1e4df4a21c5ac722df1099eee30cad9246c889b5 to < ba3bf0f1bf1d5d0404678485e872980532fcc2c4affected
  • 1e4df4a21c5ac722df1099eee30cad9246c889b5 to < d3e32e2f3262f1b25d77c085ace38e2cc4ad75cfaffected
  • 1e4df4a21c5ac722df1099eee30cad9246c889b5 to < 40126bcbefa79ea86672e05dae608596bab38319affected
  • 1e4df4a21c5ac722df1099eee30cad9246c889b5 to < 104016eb671e19709721c1b0048dd912dc2e96beaffected

Linux Linux

Default version status: affected

  • 5.16affected
  • 0 to < 5.16unaffected
  • 6.1.165 to ≤ 6.1.*unaffected
  • 6.6.128 to ≤ 6.6.*unaffected
  • 6.12.75 to ≤ 6.12.*unaffected
  • 6.18.16 to ≤ 6.18.*unaffected
  • 6.19.6 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References