{ "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": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "7.2.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/52c13c63bb3662c108244e7447055e30bf40244e" }, { "url": "https://git.kernel.org/stable/c/8a91609032d47e77bcb37bc8f6e88d89340d2709" }, { "url": "https://git.kernel.org/stable/c/ce8a379598bd4058081416abea4279fd05a95374" }, { "url": "https://git.kernel.org/stable/c/2fbac8a56004b6ce54fbfe845d4b25da6e0b55e8" }, { "url": "https://git.kernel.org/stable/c/88e429a4e9bac3d2138011c5ca06254331f2587f" }, { "url": "https://git.kernel.org/stable/c/e15eb536be4f646ce683d2867572b2200be877f7" }, { "url": "https://git.kernel.org/stable/c/117871cdb8927542abd7b65ce5995bf0265a8c05" }, { "url": "https://git.kernel.org/stable/c/33fb59da49c4c3f5c2ec9f9d4447a56857a02c02" } ], "title": "RDMA/core: fix refcount bug in iwpm_get_nlmsg_request()", "x_generator": { "engine": "bippy-1.2.0" } } } }