{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-92507", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-16T12:21:13.872Z", "datePublished": "2026-09-17T16:10:18.748Z", "dateUpdated": "2026-10-19T09:04:13.346Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:04:13.346Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Fix potential use after free in ib_dealloc_pd_user()\n\nWhen accessing a PD via the netlink path the only synchronization\nmechanism for the said PD is rdma_restrack_get().\nCurrently, rdma_restrack_del() is invoked at the end of\nib_dealloc_pd_user(), which is too late, since by that point\nvendor-specific resources associated with the PD might already be\nfreed. This can leave a short window where the PD remains accessible\nthrough restrack, leading to a potential use-after-free.\n\nFix this by moving the rdma_restrack_begin_del() call to the start of\nib_dealloc_pd_user(), ensuring that the PD is removed from restrack\nbefore its internal resources are released. This guarantees that no new\nusers hold references to a PD that is in the process of destruction.\n\nIn addition, this change preserves the intended inverted order\nbetween create and destroy routines: resources are added to\nrestrack at the end of successful creation, and hence shall be removed\nfrom the restrack first thing during the destruction flow, which keeps\nthe lifecycle management consistent and predictable." } ], "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 race is between ib_uverbs_dealloc_pd()/uverbs_free_pd() (IB_USER_VERBS_CMD_DEALLOC_PD or UVERBS_METHOD_PD_DESTROY on /dev/infiniband/uverbs*) and nldev_res_get_pd_dumpit()/nldev_res_get_pd_doit() via NETLINK_RDMA RDMA_NLDEV_CMD_RES_PD_GET. Those syscalls supply the destroy and the dump; no remote protocol message carries the malformed state.\nAC:L - The attacker runs both sides: one thread deallocates its PD while another loops RDMA_NLDEV_CMD_RES_PD_GET. res_get_common_dumpit() can rdma_restrack_get() until rdma_restrack_del(), and ops.dealloc_pd() (often a firmware round-trip) sits in that window, so the attacker creates and retries the race.\nPR:L - uverbs_devnode() sets /dev/infiniband/uverbs* to 0666, so an unprivileged process can alloc/dealloc a PD. RDMA_NLDEV_CMD_RES_PD_GET has no RDMA_NL_ADMIN_PERM, and NETLINK_RDMA is created with NL_CFG_F_NONROOT_RECV, so sendmsg to kernel portid 0 does not need CAP_NET_ADMIN.\nUI:N - The attacker opens uverbs, allocates a PD, then concurrently issues IB_USER_VERBS_CMD_DEALLOC_PD and RDMA_NLDEV_CMD_RES_PD_GET; no other user action is required.\nS:U - A successful UAF corrupts memory in ib_core and the RDMA driver on the same host kernel. It does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - ib_dealloc_pd_user() runs dereg_mr(pd->__internal_mr) and ops.dealloc_pd() before rdma_restrack_del(). fill_res_pd_entry() can still rdma_restrack_get() that PD and read pd, including pd->uobject->context. In that window bnxt_re_dealloc_pd() kfree()s fence->mr via bnxt_re_destroy_fence_mr(), so reused driver objects can disclose kernel memory.\nI:H - The same window lets the attacker spray and reuse objects freed inside ops.dealloc_pd() (bnxt_re_destroy_fence_mr() kfree(mr), rxe_cleanup() of the PD pool element) while fill_res_pd_entry() still holds the PD via restrack, which is a kernel write/control-flow hijack primitive.\nA:H - Racing nldev_res_get_pd_dumpit() against ib_dealloc_pd_user() after vendor teardown can oops in fill_res_pd_entry() while it follows pd->uobject->context on a PD whose driver state is already gone, crashing the host." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/core/verbs.c" ], "versions": [ { "version": "91a7c58fce065506fd98954d27694e5d83c96638", "lessThan": "df0e9efe61ca706a07b1c9bf93fcb9032455efc4", "status": "affected", "versionType": "git" }, { "version": "91a7c58fce065506fd98954d27694e5d83c96638", "lessThan": "7647363fa02046da681acc3c827d9f301c06e0e7", "status": "affected", "versionType": "git" }, { "version": "91a7c58fce065506fd98954d27694e5d83c96638", "lessThan": "d9c0daf9362aad2aeed1d9c5536d108772a8d31c", "status": "affected", "versionType": "git" }, { "version": "91a7c58fce065506fd98954d27694e5d83c96638", "lessThan": "66d65f36d39759e9f62dc746dc71d862f20f827f", "status": "affected", "versionType": "git" }, { "version": "91a7c58fce065506fd98954d27694e5d83c96638", "lessThan": "c06f2856a1d7e75a5ff247fc05224aa2452e7265", "status": "affected", "versionType": "git" }, { "version": "91a7c58fce065506fd98954d27694e5d83c96638", "lessThan": "8b90e701342275f414e36e7421c502237df241ad", "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/verbs.c" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "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": "5.10", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/df0e9efe61ca706a07b1c9bf93fcb9032455efc4" }, { "url": "https://git.kernel.org/stable/c/7647363fa02046da681acc3c827d9f301c06e0e7" }, { "url": "https://git.kernel.org/stable/c/d9c0daf9362aad2aeed1d9c5536d108772a8d31c" }, { "url": "https://git.kernel.org/stable/c/66d65f36d39759e9f62dc746dc71d862f20f827f" }, { "url": "https://git.kernel.org/stable/c/c06f2856a1d7e75a5ff247fc05224aa2452e7265" }, { "url": "https://git.kernel.org/stable/c/8b90e701342275f414e36e7421c502237df241ad" } ], "title": "RDMA/core: Fix potential use after free in ib_dealloc_pd_user()", "x_generator": { "engine": "bippy-1.2.0" } } } }