CVE-2026-43128

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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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43128", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:14:57.128797Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-415", "description": "CWE-415 Double Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:06:14.792Z"}}]}}

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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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "70542b69abff34d24b11ae0bb200cc7a766d18df", "versionType": "git"}, {"status": "affected", "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "b324327ff6f48d8065dca67eb3b91357e72726bd", "versionType": "git"}, {"status": "affected", "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "ba3bf0f1bf1d5d0404678485e872980532fcc2c4", "versionType": "git"}, {"status": "affected", "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf", "versionType": "git"}, {"status": "affected", "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "40126bcbefa79ea86672e05dae608596bab38319", "versionType": "git"}, {"status": "affected", "version": "1e4df4a21c5ac722df1099eee30cad9246c889b5", "lessThan": "104016eb671e19709721c1b0048dd912dc2e96be", "versionType": "git"}], "programFiles": ["drivers/infiniband/core/umem_dmabuf.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.16"}, {"status": "unaffected", "version": "0", "lessThan": "5.16", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.165", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.128", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.75", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.16", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.6", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/infiniband/core/umem_dmabuf.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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. 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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)."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nRDMA/umem: Correcci\u00f3n de doble dma_buf_unpin en la ruta de fallo\n\nEn ib_umem_dmabuf_get_pinned_with_dma_device(), la llamada a ib_umem_dmabuf_map_pages() puede fallar. Si esto ocurre, el dmabuf se desancla inmediatamente, pero el flag umem_dmabuf -> pinned sigue establecido. Luego, cuando se llama a ib_umem_release(), esta llama a ib_umem_dmabuf_revoke(), que volver\u00e1 a llamar a dma_buf_unpin().\n\nEsto se soluciona eliminando el desanclaje inmediato en caso de fallo y simplemente dejando que la ruta ib_umem_release/revoke lo gestione. Esto tambi\u00e9n asegura el orden de desenrollado adecuado de desmapeo-desanclaje si la llamada a dmabuf_map_pages llegara a fallar debido a dma_resv_wait_timeout (y por lo tanto tiene un umem_dmabuf -> sgt no nulo)."}], "id": "CVE-2026-43128", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43128", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:14:57.128797Z", "version": "2.0.3"}}]}, "published": "2026-05-06T12:16:29.837", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/104016eb671e19709721c1b0048dd912dc2e96be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/40126bcbefa79ea86672e05dae608596bab38319"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70542b69abff34d24b11ae0bb200cc7a766d18df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b324327ff6f48d8065dca67eb3b91357e72726bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ba3bf0f1bf1d5d0404678485e872980532fcc2c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-415"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: RDMA/umem: Fix double dma_buf_unpin in failure path", "id": "2467144", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467144"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's RDMA/umem subsystem. A memory management error, specifically a double unpin of a `dma_buf`, can occur in a failure path during `dma_buf` pinning operations. This vulnerability could lead to system instability or a crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-43128", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43128\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43128\nhttps://lore.kernel.org/linux-cve-announce/2026050620-CVE-2026-43128-5ff4@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e4df4a21c5ac722df1099eee30cad9246c889b5,70542b69abff34d24b11ae0bb200cc7a766d18df)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e4df4a21c5ac722df1099eee30cad9246c889b5,b324327ff6f48d8065dca67eb3b91357e72726bd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e4df4a21c5ac722df1099eee30cad9246c889b5,ba3bf0f1bf1d5d0404678485e872980532fcc2c4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e4df4a21c5ac722df1099eee30cad9246c889b5,d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e4df4a21c5ac722df1099eee30cad9246c889b5,40126bcbefa79ea86672e05dae608596bab38319)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1e4df4a21c5ac722df1099eee30cad9246c889b5,104016eb671e19709721c1b0048dd912dc2e96be)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.19.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-06T14:00:05.887812+00:00", "updated": "2026-05-08T19:45:15.209454+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}