{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43128", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.988Z", "datePublished": "2026-05-06T11:27:17.474Z", "dateUpdated": "2026-08-05T12:26:08.164Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:08.164Z" }, "descriptions": [ { "lang": "en", "value": "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)." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is reached through local RDMA uverbs ioctls such as dma-buf MR/CQ/DevX registration on /dev/infiniband/uverbs*, with a user-supplied dma-buf fd.\nAC:L - The attacker controls the ioctl inputs and dma-buf fd and can repeatedly drive the failure path after dma_buf_pin() succeeds; no uncontrollable race is required.\nPR:L - The uverbs device nodes are created mode 0666 and the relevant paths do not require CAP_* privileges, but the attacker still needs local unprivileged code execution and access to the device files.\nUI:N - No victim action is needed once the local attacker can issue the uverbs ioctl sequence.\nS:U - The impact remains within the kernel/device memory management security authority; this is not a VM escape or distinct authorization-domain boundary crossing.\nC:H - The double unpin can prematurely drop the exporter pin count while another active mapping of the same dma-buf still exists, allowing stale RDMA DMA mappings to read memory after the buffer is moved or reused.\nI:H - The same stale DMA mapping scenario can allow writes into moved or reused physical pages, giving a plausible high-impact memory corruption primitive.\nA:H - At minimum the double unpin reaches exporter/TTM WARN paths and corrupted pin/accounting state; with panic_on_warn or resulting stale-DMA corruption this can crash or destabilize the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/core/umem_dmabuf.c" ], "versions": [ { "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "70542b69abff34d24b11ae0bb200cc7a766d18df", "status": "affected", "versionType": "git" }, { "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "b324327ff6f48d8065dca67eb3b91357e72726bd", "status": "affected", "versionType": "git" }, { "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "ba3bf0f1bf1d5d0404678485e872980532fcc2c4", "status": "affected", "versionType": "git" }, { "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf", "status": "affected", "versionType": "git" }, { "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "40126bcbefa79ea86672e05dae608596bab38319", "status": "affected", "versionType": "git" }, { "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "104016eb671e19709721c1b0048dd912dc2e96be", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/core/umem_dmabuf.c" ], "versions": [ { "version": "5.16", "status": "affected" }, { "version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.165" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.6.128" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.12.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.18.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/70542b69abff34d24b11ae0bb200cc7a766d18df" }, { "url": "https://git.kernel.org/stable/c/b324327ff6f48d8065dca67eb3b91357e72726bd" }, { "url": "https://git.kernel.org/stable/c/ba3bf0f1bf1d5d0404678485e872980532fcc2c4" }, { "url": "https://git.kernel.org/stable/c/d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf" }, { "url": "https://git.kernel.org/stable/c/40126bcbefa79ea86672e05dae608596bab38319" }, { "url": "https://git.kernel.org/stable/c/104016eb671e19709721c1b0048dd912dc2e96be" } ], "title": "RDMA/umem: Fix double dma_buf_unpin in failure path", "x_generator": { "engine": "bippy-1.2.0" } } } }