{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90423", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.814Z", "datePublished": "2026-09-17T16:09:46.513Z", "dateUpdated": "2026-10-19T09:03:27.119Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:03:27.119Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix UAF in ODP init error-handling path\n\nrxe_odp_mr_init_user() stores &umem_odp->umem in mr->umem before\ncalling rxe_odp_init_pages(). If rxe_odp_init_pages() fails,\nrxe_odp_mr_init_user() releases umem_odp and returns an error.\n\nrxe_reg_user_mr() then unwinds the error through rxe_cleanup(),\nrxe_mr_cleanup(), ib_umem_release(mr->umem). There is an\nIS_ERR_OR_NULL(umem) check at the start of ib_umem_release().\nBut since mr->umem is NOT reset to NULL in the error handling\npath of rxe_odp_mr_init_user(), the check passes and it reads\nalready-freed fields like umem->is_dmabuf, causing UAF.\n\nFix the UAF by clearing mr->umem after releasing the failed\nODP umem so the MR cleanup path does not release it again." } ], "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 attacker-controlled bytes are cmd.access_flags (IB_ACCESS_ON_DEMAND), cmd.start and cmd.length from IB_USER_VERBS_CMD_REG_MR written to /dev/infiniband/uverbsN; ib_uverbs_write→ib_uverbs_reg_mr→rxe_reg_user_mr→rxe_odp_mr_init_user. Soft-RoCE packet receive never supplies that REG_MR command.\nAC:L - rxe_odp_init_pages() fails when ib_umem_odp_map_dma_and_lock() returns an error from hmm_range_fault(); a second thread in the same process can munmap the REG_MR VA so rxe_ib_invalidate_range() keeps invalidating the mmu_interval until HMM_RANGE_DEFAULT_TIMEOUT (1000ms) expires with -EBUSY. The UAF on that error path is then deterministic.\nPR:L - uverbs_devnode() publishes /dev/infiniband/uverbs* as 0666; ib_uverbs_open, ib_uverbs_get_context, ib_uverbs_alloc_pd and ib_uverbs_reg_mr have no capability checks, and rxe_init_device_param sets IBK_ON_DEMAND_PAGING so ib_check_mr_access() accepts IB_ACCESS_ON_DEMAND.\nUI:N - The attacker opens uverbs, allocates a PD, and issues REG_MR with IB_ACCESS_ON_DEMAND against a VA range they own; no other user must mount, open, or confirm anything.\nS:U - rxe_mr_cleanup() calls ib_umem_release() on the dangling mr->umem inside the same host kernel; this does not cross a KVM, Xen, or IOMMU boundary.\nC:H - After ib_umem_odp_release() kfree's umem_odp, ib_umem_release(mr->umem) reads the freed umem->is_dmabuf and umem->is_odp; slab reuse lets the attacker control those flags and later pointers such as ibdev and owning_mm.\nI:H - The dangling mr->umem still has is_odp set, so ib_umem_release() calls ib_umem_odp_release() again and kfree's the already-freed umem_odp, a heap double-free write primitive.\nA:H - The UAF load of umem->is_dmabuf in ib_umem_release() and the second free of umem_odp oops or KASAN-crash 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/sw/rxe/rxe_odp.c" ], "versions": [ { "version": "d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91", "lessThan": "5f1933163327c9f1c8f2a341c6cb551aaf231ff9", "status": "affected", "versionType": "git" }, { "version": "d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91", "lessThan": "4cfb448705da3171d44d9cbe7be53ff03284d532", "status": "affected", "versionType": "git" }, { "version": "d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91", "lessThan": "51f2c8d2c99fc1f452f7113c08a35edcc4bf8732", "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/sw/rxe/rxe_odp.c" ], "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "lessThan": "6.15", "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": "6.15", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5f1933163327c9f1c8f2a341c6cb551aaf231ff9" }, { "url": "https://git.kernel.org/stable/c/4cfb448705da3171d44d9cbe7be53ff03284d532" }, { "url": "https://git.kernel.org/stable/c/51f2c8d2c99fc1f452f7113c08a35edcc4bf8732" } ], "title": "RDMA/rxe: Fix UAF in ODP init error-handling path", "x_generator": { "engine": "bippy-1.2.0" } } } }