RDMA/umem: Fix double dma_buf_unpin in failure path_CVE-2026-43128

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/umem: Fix double dma_buf_unpin in failure path\n\nIn ib_umem_dmabuf_get_pinned_with_dma_device(), the call to\nib_umem_dmabuf_map_pages() can fail. If this occurs, the dmabuf\nis immediately unpinned but the umem_dmabuf->pinned flag is still\nset. Then, when ib_umem_release() is called, it calls\nib_umem_dmabuf_revoke() which will call dma_buf_unpin() again.\n\nFix this by removing the immediate unpin upon failure and just let\nthe ib_umem_release/revoke path handle it. This also ensures the\nproper unmap-unpin unwind ordering if the dmabuf_map_pages call\nhappened to fail due to dma_resv_wait_timeout (and therefore has\na non-NULL umem_dmabuf->sgt).",
    "published": "2026-05-06T11:27:17.474Z",
    "modified": "2026-05-08T12:40:46.828Z",
    "type": "cve",
    "title": "RDMA/umem: Fix double dma_buf_unpin in failure path",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/70542b69abff34d24b11ae0bb200cc7a766d18df\nhttps://git.kernel.org/stable/c/b324327ff6f48d8065dca67eb3b91357e72726bd\nhttps://git.kernel.org/stable/c/ba3bf0f1bf1d5d0404678485e872980532fcc2c4\nhttps://git.kernel.org/stable/c/d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf\nhttps://git.kernel.org/stable/c/40126bcbefa79ea86672e05dae608596bab38319\nhttps://git.kernel.org/stable/c/104016eb671e19709721c1b0048dd912dc2e96be",
    "id": "CVE-2026-43128",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 1e4df4a21c5ac722df1099eee30cad9246c889b5\nLinux Linux 1e4df4a21c5ac722df1099eee30cad9246c889b5\nLinux Linux 1e4df4a21c5ac722df1099eee30cad9246c889b5\nLinux Linux 1e4df4a21c5ac722df1099eee30cad9246c889b5\nLinux Linux 1e4df4a21c5ac722df1099eee30cad9246c889b5\nLinux Linux 1e4df4a21c5ac722df1099eee30cad9246c889b5\nLinux Linux 5.16",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}