{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90308", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.800Z", "datePublished": "2026-09-17T16:08:29.704Z", "dateUpdated": "2026-10-19T09:01:25.925Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:01:25.925Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/erdma: Hold QP references for AE and CM processing\n\nAE QP fatal events and iWARP CM paths load QPs from dev->qp_xa\nand then use or reference them outside the xarray lock.\nerdma_destroy_qp() can drop the destroy-path reference and free QP\nresources while such a lookup is in flight.\n\nAdd erdma_qp_get_by_qpn() to acquire a kref under the xarray\nlock with kref_get_unless_zero(). Remove the QP from the xarray\nbefore dropping the destroy-path reference so no new lookup can acquire\nit while destruction waits for existing users." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The UAF is a race between local ib_uverbs_destroy_qp()->erdma_destroy_qp() dropping the QP kref and either ucma_connect()/ucma_accept() (RDMA_USER_CM_CONNECT/ACCEPT -> iw_cm_connect()/iw_cm_accept() -> erdma_connect()/erdma_accept() xa_load of userspace params->qpn) or erdma_comm_irq_handler()->erdma_aeq_event_handler(). The CM QPN is rdma_ucm_conn_param.qp_num, not a remote iWARP/RoCE field.\nAC:L - The attacker who created the QP drives both sides: one thread issues ucma_connect()/ucma_accept() or QP ops that produce an AEQE, while another calls ib_uverbs_destroy_qp(), racing find_qp_by_qpn()/xa_load against the destroy-path erdma_qp_put(). The window (bare xa_load, then kref_get or no get at all) can be retried across many QPs.\nPR:L - ib_uverbs_open() and ucma_open() perform no capability check; uverbs_devnode() and ucma_misc.mode publish /dev/infiniband/uverbs* and /dev/infiniband/rdma_cm as 0666, so an unprivileged user on an ERDMA host can create_qp, RDMA_USER_CM_CONNECT/ACCEPT, and destroy_qp.\nUI:N - The attacker creates the QP via uverbs, issues ucma_connect()/ucma_accept() (or generates an AEQE) and ib_uverbs_destroy_qp() from their own processes; no other user must mount, open, or otherwise act.\nS:U - The use-after-free is of the host kernel's struct erdma_qp (kref, ibqp.event_handler, queue buffers) under the same kernel authority and does not cross a VM, IOMMU, or guest-host boundary.\nC:H - After erdma_destroy_qp() drops the last kref and the RDMA core frees the QP, erdma_aeq_event_handler() still reads qp->ibqp.event_handler and qp_context from the freed object, and erdma_connect() may kref_get a freed QP; a sprayed replacement yields a kernel-memory read primitive.\nI:H - erdma_aeq_event_handler() invokes qp->ibqp.event_handler on the freed erdma_qp, and erdma_connect()/erdma_accept() write qp->cep and take qp->state_lock after a lockless xa_load; reclaiming that object gives a function-pointer call and kernel writes.\nA:H - Using the QP after erdma_qp_put()/wait_for_completion() has released its queues and the ib_qp object causes a kernel oops or panic in erdma_aeq_event_handler() or in erdma_connect()/erdma_accept()." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/erdma/erdma_cm.c", "drivers/infiniband/hw/erdma/erdma_eq.c", "drivers/infiniband/hw/erdma/erdma_verbs.c", "drivers/infiniband/hw/erdma/erdma_verbs.h" ], "versions": [ { "version": "155055771704f8cbb5c176a4309b7dc30a50450c", "lessThan": "6e32f84b63c054e09392153125d7202abab2d14b", "status": "affected", "versionType": "git" }, { "version": "155055771704f8cbb5c176a4309b7dc30a50450c", "lessThan": "ec987c0654651036dad6a42f7fa2a6d7c16a3687", "status": "affected", "versionType": "git" }, { "version": "155055771704f8cbb5c176a4309b7dc30a50450c", "lessThan": "c92686867638cda954fdb2bdbac8a75e3aa6eaae", "status": "affected", "versionType": "git" }, { "version": "155055771704f8cbb5c176a4309b7dc30a50450c", "lessThan": "a52eeff32024f190b3bdc99088c7becccd4fa60b", "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/erdma/erdma_cm.c", "drivers/infiniband/hw/erdma/erdma_eq.c", "drivers/infiniband/hw/erdma/erdma_verbs.c", "drivers/infiniband/hw/erdma/erdma_verbs.h" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "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": "6.0", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6e32f84b63c054e09392153125d7202abab2d14b" }, { "url": "https://git.kernel.org/stable/c/ec987c0654651036dad6a42f7fa2a6d7c16a3687" }, { "url": "https://git.kernel.org/stable/c/c92686867638cda954fdb2bdbac8a75e3aa6eaae" }, { "url": "https://git.kernel.org/stable/c/a52eeff32024f190b3bdc99088c7becccd4fa60b" } ], "title": "RDMA/erdma: Hold QP references for AE and CM processing", "x_generator": { "engine": "bippy-1.2.0" } } } }