CVE-2026-43128

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux1e4df4a21c5ac722df1099eee30cad9246c889b5 < 70542b69abff34d24b11ae0bb200cc7a766d18dfaffected
LinuxLinux1e4df4a21c5ac722df1099eee30cad9246c889b5 < b324327ff6f48d8065dca67eb3b91357e72726bdaffected
LinuxLinux1e4df4a21c5ac722df1099eee30cad9246c889b5 < ba3bf0f1bf1d5d0404678485e872980532fcc2c4affected
LinuxLinux1e4df4a21c5ac722df1099eee30cad9246c889b5 < d3e32e2f3262f1b25d77c085ace38e2cc4ad75cfaffected
LinuxLinux1e4df4a21c5ac722df1099eee30cad9246c889b5 < 40126bcbefa79ea86672e05dae608596bab38319affected
LinuxLinux1e4df4a21c5ac722df1099eee30cad9246c889b5 < 104016eb671e19709721c1b0048dd912dc2e96beaffected
LinuxLinux5.16affected
LinuxLinux0 < 5.16unaffected
LinuxLinux6.1.165 <= 6.1.*unaffected
LinuxLinux6.6.128 <= 6.6.*unaffected
LinuxLinux6.12.75 <= 6.12.*unaffected
LinuxLinux6.18.16 <= 6.18.*unaffected
LinuxLinux6.19.6 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References