CVE-2026-72496

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The flaw is reached only through local RDMA uverbs ioctl/write on /dev/infiniband/uverbs* (ibv_alloc_pd and BNXT_RE_ALLOC_WC_PAGE call bnxt_qplib_alloc_dpi); remote RoCE packet handling and in-kernel RDMA target/server paths never invoke this DPI setup routine.\nAC:L - An attacker can induce vmalloc/ioremap failure with local memory pressure, then repeatedly invoke alloc_pd or WC-page allocation; each call deterministically leaves a consumed DPI with NULL dbr, and subsequent create_cq/QP/SRQ doorbell rings fault without races or uncontrollable layout.\nPR:N - ib_uverbs creates per-device character nodes as mode 0666, so any local process can open uverbs, allocate a context, and call alloc_pd or alloc_page without CAP_SYS_ADMIN, init-namespace root, or other elevated capabilities on typical HPC/cloud RDMA hosts.\nUI:N - Exploitation requires only the attacker's own RDMA verbs sequence (alloc_context, alloc_pd or alloc_page, then create_cq/QP/SRQ and I/O); no cooperative action by another user, administrator, or victim mounting devices or opening files is needed.\nS:C - On Kubernetes/HPC hosts exposing bnxt_re to tenant containers or unprivileged RDMA workloads, triggering host-kernel NULL doorbell writes or exhausting finite DPI indices from a workload crosses the container/tenant security boundary to the hypervisor/host authority.\nC:L - Returning success after failed ioremap leaves DPI metadata and a mmapable BAR doorbell offset active while kernel dpi->dbr stays NULL, disclosing doorbell-index/BAR layout to the caller and enabling follow-on corruption when doorbells are later rung.\nI:H - With dpi->dbr left NULL, bnxt_qplib_ring_db and ring_prod_db issue writeq() to NULL during CQ, SQ, RQ, and SRQ doorbell updates on subsequent verbs activity, providing a kernel write primitive and control-flow disruption beyond a benign error return.\nA:H - NULL doorbell writeq faults oops or panic the kernel when CQ/QP/SRQ objects are used after the bogus allocation, and each successful-but-broken DPI allocation permanently consumes a finite doorbell index, enabling repeated denial of RDMA service to other tenants."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/infiniband/hw/bnxt_re/qplib_res.c"], "versions": [{"version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f", "lessThan": "00444baa8f74d220764ee5903f60759c120cabd5", "status": "affected", "versionType": "git"}, {"version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f", "lessThan": "3c69ff7f4a761e18ce8abfa0c98e12097b39adaa", "status": "affected", "versionType": "git"}, {"version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f", "lessThan": "f956477c343aa73e9d9c8d6ebf32efac7cd4f4e2", "status": "affected", "versionType": "git"}, {"version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f", "lessThan": "303f6fef95df5e5316970746d861cf6daeeca77f", "status": "affected", "versionType": "git"}, {"version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f", "lessThan": "87267803a8c824616eb147c5dad7030a5db6f878", "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/hw/bnxt_re/qplib_res.c"], "versions": [{"version": "6.5", "status": "affected"}, {"version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.5", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/00444baa8f74d220764ee5903f60759c120cabd5"}, {"url": "https://git.kernel.org/stable/c/3c69ff7f4a761e18ce8abfa0c98e12097b39adaa"}, {"url": "https://git.kernel.org/stable/c/f956477c343aa73e9d9c8d6ebf32efac7cd4f4e2"}, {"url": "https://git.kernel.org/stable/c/303f6fef95df5e5316970746d861cf6daeeca77f"}, {"url": "https://git.kernel.org/stable/c/87267803a8c824616eb147c5dad7030a5db6f878"}], "title": "RDMA/bnxt_re: Proper rollback if the ioremap fails", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72496", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T18:51:05.048761Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:27.134Z"}}]}}

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An attacker can induce vmalloc/ioremap failure with local memory pressure, then repeatedly invoke alloc_pd or WC-page allocation; each call deterministically leaves a consumed DPI with NULL dbr, and subsequent create_cq/QP/SRQ doorbell rings fault without races or uncontrollable layout.\nPR:N - ib_uverbs creates per-device character nodes as mode 0666, so any local process can open uverbs, allocate a context, and call alloc_pd or alloc_page without CAP_SYS_ADMIN, init-namespace root, or other elevated capabilities on typical HPC/cloud RDMA hosts.\nUI:N - Exploitation requires only the attacker's own RDMA verbs sequence (alloc_context, alloc_pd or alloc_page, then create_cq/QP/SRQ and I/O); no cooperative action by another user, administrator, or victim mounting devices or opening files is needed.\nS:C - On Kubernetes/HPC hosts exposing bnxt_re to tenant containers or unprivileged RDMA workloads, triggering host-kernel NULL doorbell writes or exhausting finite DPI indices from a workload crosses the container/tenant security boundary to the hypervisor/host authority.\nC:L - Returning success after failed ioremap leaves DPI metadata and a mmapable BAR doorbell offset active while kernel dpi->dbr stays NULL, disclosing doorbell-index/BAR layout to the caller and enabling follow-on corruption when doorbells are later rung.\nI:H - With dpi->dbr left NULL, bnxt_qplib_ring_db and ring_prod_db issue writeq() to NULL during CQ, SQ, RQ, and SRQ doorbell updates on subsequent verbs activity, providing a kernel write primitive and control-flow disruption beyond a benign error return.\nA:H - NULL doorbell writeq faults oops or panic the kernel when CQ/QP/SRQ objects are used after the bogus allocation, and each successful-but-broken DPI allocation permanently consumes a finite doorbell index, enabling repeated denial of RDMA service to other tenants."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f", "lessThan": "00444baa8f74d220764ee5903f60759c120cabd5", "versionType": "git"}, {"status": "affected", "version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f", "lessThan": "3c69ff7f4a761e18ce8abfa0c98e12097b39adaa", "versionType": "git"}, {"status": "affected", "version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f", "lessThan": "f956477c343aa73e9d9c8d6ebf32efac7cd4f4e2", "versionType": "git"}, {"status": "affected", "version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f", "lessThan": "303f6fef95df5e5316970746d861cf6daeeca77f", "versionType": "git"}, {"status": "affected", "version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f", "lessThan": "87267803a8c824616eb147c5dad7030a5db6f878", "versionType": "git"}], "programFiles": ["drivers/infiniband/hw/bnxt_re/qplib_res.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.5"}, {"status": "unaffected", "version": "0", "lessThan": "6.5", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.158", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.111", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.53", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/infiniband/hw/bnxt_re/qplib_res.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/00444baa8f74d220764ee5903f60759c120cabd5"}, {"url": "https://git.kernel.org/stable/c/3c69ff7f4a761e18ce8abfa0c98e12097b39adaa"}, {"url": "https://git.kernel.org/stable/c/f956477c343aa73e9d9c8d6ebf32efac7cd4f4e2"}, {"url": "https://git.kernel.org/stable/c/303f6fef95df5e5316970746d861cf6daeeca77f"}, {"url": "https://git.kernel.org/stable/c/87267803a8c824616eb147c5dad7030a5db6f878"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/bnxt_re: Proper rollback if the ioremap fails\n\nbnxt_qplib_alloc_dpi returns success even if ioremap fails.\nAdd the proper rollback when the ioremap fails and return\n-ENOMEM status."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.158", "versionStartIncluding": "6.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.111", "versionStartIncluding": "6.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.53", "versionStartIncluding": "6.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "6.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:55:55.579Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72496", "state": "PUBLISHED", "dateUpdated": "2026-10-16T18:55:27.134Z", "dateReserved": "2026-08-09T03:40:39.937Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:57:29.723Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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{"bugzilla": {"description": "kernel: RDMA/bnxt_re: Proper rollback if the ioremap fails", "id": "2516757", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516757"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-252", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nRDMA/bnxt_re: Proper rollback if the ioremap fails\nbnxt_qplib_alloc_dpi returns success even if ioremap fails.\nAdd the proper rollback when the ioremap fails and return\n-ENOMEM status.", "A flaw was found in the Linux kernel's RDMA/bnxt_re component. When the `bnxt_qplib_alloc_dpi` function attempts to map I/O memory (`ioremap`), it may not properly handle failures. This oversight could lead to system instability or a denial of service (DoS) condition, as the system might proceed with an invalid memory state."], "name": "CVE-2026-72496", "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72496\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72496\nhttps://lore.kernel.org/linux-cve-announce/2026081539-CVE-2026-72496-1bef@gregkh/T"], "threat_severity": "Low"}

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