{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72500", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.937Z", "datePublished": "2026-08-15T05:57:32.341Z", "dateUpdated": "2026-10-21T12:45:07.452Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:45:07.452Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/bnxt_re: Free SRQ toggle page after firmware teardown\n\nFree the toggle page only after firmware teardown completes so that\nan NQ interrupt arriving during bnxt_qplib_destroy_srq() won't write\nthe toggle values to an already-freed page. Move free_page() after\nbnxt_qplib_destroy_srq()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is triggered by destroying a user SRQ through the RDMA uverbs ioctl on /dev/infiniband/uverbs*; although RoCE peers can generate SRQ/NQ events, the premature free_page() only occurs in this local destroy path, not from remote packet handling alone.\nAC:L - An attacker controls SRQ teardown timing via ibv_destroy_srq and can reliably create the race by keeping QPs/posted receives active and/or soliciting SRQ threshold events (including from a cooperating RoCE peer) while destroy_srq runs through bnxt_qplib_destroy_srq firmware teardown.\nPR:L - Exploitation requires only local RDMA verbs access to create/destroy a user SRQ on a Gen P7 bnxt_re device; uverbs char devices are created world-accessible (0666) and RDMA is commonly granted to unprivileged HPC/cloud/Kubernetes workload users rather than real root.\nUI:N - No victim interaction is required beyond the attacker (or compromised local workload) invoking SRQ destroy on resources it already controls; remote peers may assist timing but do not need the victim to click, mount, or open files.\nS:C - On Kubernetes/HPC hosts that expose bnxt_re to containers/pods, triggering this host-kernel UAF from an unprivileged RDMA-enabled workload can corrupt host memory and enable container-to-host sandbox escape beyond the workload security boundary.\nC:H - This is a kernel write-after-free: an NQ interrupt writes a toggle value into a page already returned to the buddy allocator, enabling corruption of subsequently reallocated kernel objects and classic UAF-based information disclosure primitives.\nI:H - The interrupt path performs a controlled 4-byte write to freed kernel memory during destroy_srq, providing a heap corruption primitive that can be developed into arbitrary kernel write or code execution rather than being limited to a benign crash.\nA:H - Writing to a freed page during interrupt handling can oops/panic the kernel immediately, and repeated SRQ create/destroy cycles let an attacker reliably induce host-level denial of service on RDMA-enabled systems." } ] } ], "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/ib_verbs.c" ], "versions": [ { "version": "181028a0d84cdcc7ac86d05cc49eaa416ce85c8b", "lessThan": "3b6ecad5b9b0f7230ed725aafaf8c4ed9327a9bf", "status": "affected", "versionType": "git" }, { "version": "181028a0d84cdcc7ac86d05cc49eaa416ce85c8b", "lessThan": "104a7ff382a58a83cae018925e3574c784e8274c", "status": "affected", "versionType": "git" }, { "version": "181028a0d84cdcc7ac86d05cc49eaa416ce85c8b", "lessThan": "0adcd67f3d6f84835be682da0153f57f5c2f8036", "status": "affected", "versionType": "git" }, { "version": "181028a0d84cdcc7ac86d05cc49eaa416ce85c8b", "lessThan": "131e2918b9b0529687e67e2e58047304027f095a", "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/ib_verbs.c" ], "versions": [ { "version": "6.12", "status": "affected" }, { "version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "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": "6.12", "versionEndExcluding": "6.12.114" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3b6ecad5b9b0f7230ed725aafaf8c4ed9327a9bf" }, { "url": "https://git.kernel.org/stable/c/104a7ff382a58a83cae018925e3574c784e8274c" }, { "url": "https://git.kernel.org/stable/c/0adcd67f3d6f84835be682da0153f57f5c2f8036" }, { "url": "https://git.kernel.org/stable/c/131e2918b9b0529687e67e2e58047304027f095a" } ], "title": "RDMA/bnxt_re: Free SRQ toggle page after firmware teardown", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-72500", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T18:51:15.063449Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:27.608Z" } } ] } }