{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98252", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.331Z", "datePublished": "2026-10-06T08:45:19.393Z", "dateUpdated": "2026-10-19T09:16:23.591Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:16:23.591Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: fix refcount bug in iwpm_get_nlmsg_request()\n\niwpm_get_nlmsg_request() initializes refcount _after_ list_add_tail()\nmaking it accessible to global list where another CPU can kref_get()\non nlmsg_request causing a refcount \"addition on 0\" bug. Fix this\nby initializing kref _before_ list_add_tail() so refcount for\nnlmsg_request can be incremented/decremented normally. In addition,\nalso initialize every field before list_add_tail()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The triggering input is a forged IWPM reply (e.g. RDMA_NL_IWPM_REG_PID) sent over a local NETLINK_RDMA socket to iwcm_nl_cb_table callbacks, which call iwpm_find_nlmsg_request(). No remote protocol carries it, and rdma_nl_rcv_msg() rejects RDMA_NL_IWCM messages from outside init_net.\nAC:H - The forged reply must land in the few-instruction gap between list_add_tail() and kref_init()/sema_init() in iwpm_get_nlmsg_request(). The host also needs an iWARP device so that iw_cm_map() sends port-mapper requests, and the attacker cannot set that up.\nPR:L - No iwcm_nl_cb_table entry sets RDMA_NL_ADMIN_PERM, and the NETLINK_RDMA socket uses NL_CFG_F_NONROOT_RECV, so an unprivileged user in the initial netns can join RDMA_NL_GROUP_IWPM, read the sequence numbers and send replies. A local login is still needed.\nUI:N - The attacker sends the netlink replies and starts iWARP connection setup without any action from another user.\nS:U - The memory corruption stays inside the kernel's own security authority. No guest/host or IOMMU boundary is crossed.\nC:H - kref_init() erases the reference taken by iwpm_find_nlmsg_request(), so the requester's kref_put() in iwpm_wait_complete_req() can free the kmalloc'd iwpm_nlmsg_request while iwpm_register_pid_cb() still uses it. That is a use-after-free that can be reclaimed by sprayed data.\nI:H - After the early free, the callback's up(&nlmsg_request->sem) and the requester's down_timeout() write a semaphore inside a freed and possibly reclaimed slab object. That is a use-after-free write on heap memory.\nA:H - The race fires a refcount_t 'addition on 0' WARN (a panic under panic_on_warn), and the replies can dereference NULL req_buffer in iwpm_register_pid_cb() or touch freed memory, either of which oopses 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/iwpm_util.c"], "versions": [{"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "52c13c63bb3662c108244e7447055e30bf40244e", "status": "affected", "versionType": "git"}, {"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "8a91609032d47e77bcb37bc8f6e88d89340d2709", "status": "affected", "versionType": "git"}, {"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "ce8a379598bd4058081416abea4279fd05a95374", "status": "affected", "versionType": "git"}, {"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "2fbac8a56004b6ce54fbfe845d4b25da6e0b55e8", "status": "affected", "versionType": "git"}, {"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "88e429a4e9bac3d2138011c5ca06254331f2587f", "status": "affected", "versionType": "git"}, {"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "e15eb536be4f646ce683d2867572b2200be877f7", "status": "affected", "versionType": "git"}, {"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "117871cdb8927542abd7b65ce5995bf0265a8c05", "status": "affected", "versionType": "git"}, {"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "33fb59da49c4c3f5c2ec9f9d4447a56857a02c02", "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/iwpm_util.c"], "versions": [{"version": "3.16", "status": "affected"}, {"version": "0", "lessThan": "3.16", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.8", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "3.16", "versionEndExcluding": "5.10.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.12.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.18.54"}, {"vulnerable": true, "criteria": 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iwpm_get_nlmsg_request()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/infiniband/core/iwpm_util.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "52c13c63bb3662c108244e7447055e30bf40244e", "status": "affected", "version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "versionType": "git"}, {"lessThan": "8a91609032d47e77bcb37bc8f6e88d89340d2709", "status": "affected", "version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "versionType": "git"}, {"lessThan": "ce8a379598bd4058081416abea4279fd05a95374", "status": "affected", "version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "versionType": "git"}, {"lessThan": "2fbac8a56004b6ce54fbfe845d4b25da6e0b55e8", "status": "affected", "version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "versionType": "git"}, {"lessThan": "88e429a4e9bac3d2138011c5ca06254331f2587f", "status": "affected", "version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "versionType": "git"}, {"lessThan": "e15eb536be4f646ce683d2867572b2200be877f7", "status": "affected", "version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "versionType": "git"}, {"lessThan": "117871cdb8927542abd7b65ce5995bf0265a8c05", "status": "affected", "version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "versionType": "git"}, {"lessThan": "33fb59da49c4c3f5c2ec9f9d4447a56857a02c02", "status": "affected", "version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/infiniband/core/iwpm_util.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.16"}, {"lessThan": "3.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.271", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.54", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: fix refcount bug in iwpm_get_nlmsg_request()\n\niwpm_get_nlmsg_request() initializes refcount _after_ list_add_tail()\nmaking it accessible to global list where another CPU can kref_get()\non nlmsg_request causing a refcount \"addition on 0\" bug. Fix this\nby initializing kref _before_ list_add_tail() so refcount for\nnlmsg_request can be incremented/decremented normally. In addition,\nalso initialize every field before list_add_tail()."}], "id": "CVE-2026-98252", "lastModified": "2026-10-19T10:18:26.110", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-10-06T09:18:13.723", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/117871cdb8927542abd7b65ce5995bf0265a8c05"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2fbac8a56004b6ce54fbfe845d4b25da6e0b55e8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/33fb59da49c4c3f5c2ec9f9d4447a56857a02c02"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/52c13c63bb3662c108244e7447055e30bf40244e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/88e429a4e9bac3d2138011c5ca06254331f2587f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8a91609032d47e77bcb37bc8f6e88d89340d2709"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ce8a379598bd4058081416abea4279fd05a95374"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e15eb536be4f646ce683d2867572b2200be877f7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: RDMA/core: fix refcount bug in iwpm_get_nlmsg_request()", "id": "2546476", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2546476"}, "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-366", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nRDMA/core: fix refcount bug in iwpm_get_nlmsg_request()\niwpm_get_nlmsg_request() initializes refcount _after_ list_add_tail()\nmaking it accessible to global list where another CPU can kref_get()\non nlmsg_request causing a refcount \"addition on 0\" bug. Fix this\nby initializing kref _before_ list_add_tail() so refcount for\nnlmsg_request can be incremented/decremented normally. In addition,\nalso initialize every field before list_add_tail().", "A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) subsystem. This flaw allows a local attacker to cause a denial of service (DoS) due to a race condition in the iWARP port mapper component. Because request structures are added to a shared tracking list before their reference counters are initialized, concurrent access from another processor core can manipulate uninitialized reference counts and trigger a kernel crash."], "name": "CVE-2026-98252", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98252\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98252\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98252.mbox"], "threat_severity": "Moderate"}