{"id":"CVE-2026-72496","state":"PUBLISHED","title":"RDMA/bnxt_re: Proper rollback if the ioremap fails","description":"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.","publishedAt":"2026-08-15T05:57:29.723Z","updatedAt":"2026-10-16T18:55:27.134Z","severity":{"score":9.2,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0ac20faf5d837b59fb4c041ea320932ed47fd67f","status":"affected","lessThan":"00444baa8f74d220764ee5903f60759c120cabd5","versionType":"git"},{"version":"0ac20faf5d837b59fb4c041ea320932ed47fd67f","status":"affected","lessThan":"3c69ff7f4a761e18ce8abfa0c98e12097b39adaa","versionType":"git"},{"version":"0ac20faf5d837b59fb4c041ea320932ed47fd67f","status":"affected","lessThan":"f956477c343aa73e9d9c8d6ebf32efac7cd4f4e2","versionType":"git"},{"version":"0ac20faf5d837b59fb4c041ea320932ed47fd67f","status":"affected","lessThan":"303f6fef95df5e5316970746d861cf6daeeca77f","versionType":"git"},{"version":"0ac20faf5d837b59fb4c041ea320932ed47fd67f","status":"affected","lessThan":"87267803a8c824616eb147c5dad7030a5db6f878","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/hw/bnxt_re/qplib_res.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.5","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/hw/bnxt_re/qplib_res.c"]}],"references":["https://git.kernel.org/stable/c/00444baa8f74d220764ee5903f60759c120cabd5","https://git.kernel.org/stable/c/3c69ff7f4a761e18ce8abfa0c98e12097b39adaa","https://git.kernel.org/stable/c/f956477c343aa73e9d9c8d6ebf32efac7cd4f4e2","https://git.kernel.org/stable/c/303f6fef95df5e5316970746d861cf6daeeca77f","https://git.kernel.org/stable/c/87267803a8c824616eb147c5dad7030a5db6f878"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72496.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72496","state":"PUBLISHED","datePublished":"2026-08-15T05:57:29.723Z","dateUpdated":"2026-10-16T18:55:27.134Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.937Z"},"containers":{"cna":{"title":"RDMA/bnxt_re: Proper rollback if the ioremap fails","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0ac20faf5d837b59fb4c041ea320932ed47fd67f","status":"affected","lessThan":"00444baa8f74d220764ee5903f60759c120cabd5","versionType":"git"},{"version":"0ac20faf5d837b59fb4c041ea320932ed47fd67f","status":"affected","lessThan":"3c69ff7f4a761e18ce8abfa0c98e12097b39adaa","versionType":"git"},{"version":"0ac20faf5d837b59fb4c041ea320932ed47fd67f","status":"affected","lessThan":"f956477c343aa73e9d9c8d6ebf32efac7cd4f4e2","versionType":"git"},{"version":"0ac20faf5d837b59fb4c041ea320932ed47fd67f","status":"affected","lessThan":"303f6fef95df5e5316970746d861cf6daeeca77f","versionType":"git"},{"version":"0ac20faf5d837b59fb4c041ea320932ed47fd67f","status":"affected","lessThan":"87267803a8c824616eb147c5dad7030a5db6f878","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/hw/bnxt_re/qplib_res.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.5","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/hw/bnxt_re/qplib_res.c"]}],"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"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H","baseScore":9.2,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:L - 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 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