{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68419", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.391Z", "datePublished": "2026-08-10T12:04:39.912Z", "dateUpdated": "2026-08-17T05:05:14.336Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:05:14.336Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/irdma: Prevent rereg_mr for non-mem regions\n\nWhen a QP/CQ/SRQ is created, a two step process is used\nwhere the buffer is allocated in userspace and explicitly\nregistered with the normal reg_mr mechanism prior to creating\nthe actual QP/CQ/SRQ object.\n\nThese special registrations are indicated via an ABI field\nso the driver knows that they do not have a valid mkey and\nto skip the actual CQP command submission.\n\nSince these are real MR objects from the core's perspective,\nit is possible for a user application to invoke rereg_mr on them\nand cause a real CQP op to be emitted with the zero-initialized\nmkey value of 0.\n\nFix this by preventing rereg_mr on these special regions." } ], "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 vulnerability is reached through the ib_uverbs REREG_MR command on /dev/infiniband/uverbs*, a local character device; no network input reaches irdma_rereg_user_mr(). The resulting corrupt hardware STAG can later be abused over RDMA, but initial access is local.\nAC:L - The attacker fully controls every precondition: register a buffer with reg_type IRDMA_MEMREG_TYPE_QP/CQ/SRQ, then call rereg_mr on that handle. There is no race, no timing dependency and no reliance on memory layout the attacker cannot influence.\nPR:L - Only an open file descriptor on /dev/infiniband/uverbsN is needed; rdma-core udev rules ship these nodes world-accessible (0666) and they are routinely exposed to containers. ib_uverbs_rereg_mr() performs no capability check, only uobject ownership of the caller's own MR.\nUI:N - The attacker performs the entire sequence (reg_mr with a non-MEM reg_type, then rereg_mr) from its own process. No action by any other user or administrator is required.\nS:U - The corruption stays within the kernel/RDMA-device security authority managed by the same OS instance; there is no VM, IOMMU or hypervisor boundary crossed by the erroneous CQP command.\nC:H - Programming HW STAG index 0 with attacker-chosen remote-read rights, combined with dereg_mr never invalidating it, leaves a live hardware mapping over PBLEs and umem pages that are freed and reused, giving RDMA-read access to recycled kernel/other-process memory; it can also collide with another process's MR at stag index 0.\nI:H - The same stale/hijacked STAG can carry IB_ACCESS_REMOTE_WRITE, and the IB_MR_REREG_TRANS path frees the PBLEs and releases the umem of a live QP/CQ/SRQ while hardware keeps DMAing into those pages, yielding device-driven writes into freed and reallocated kernel memory.\nA:H - Issuing a CQP op with a zero mkey corrupts device state and can fail the CQP op, triggering the driver's reset path; the DMA-after-free into recycled pages and the clobbering of another region's STAG readily produce kernel memory corruption, oops or full RDMA device reset." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/irdma/verbs.c" ], "versions": [ { "version": "715fdb3b30541cc8180b7cdc6aa9f8c307afdf25", "lessThan": "fb46d134e1b8690bed2da9005b36d32d2efd34ac", "status": "affected", "versionType": "git" }, { "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "lessThan": "b5029e91c63406e4f4c8d58161048b41b6f0bd8c", "status": "affected", "versionType": "git" }, { "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "lessThan": "ca1c29f05274b737dc964e28b97803750d7cf7ec", "status": "affected", "versionType": "git" }, { "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "lessThan": "dbaa37e060918c45517786e37ecab0f300b48fa9", "status": "affected", "versionType": "git" }, { "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "lessThan": "a846aecb931b4d65d5eafa92a0623545af46d4f2", "status": "affected", "versionType": "git" }, { "version": "6.6.120", "lessThan": "6.6.148", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/irdma/verbs.c" ], "versions": [ { "version": "6.7", "status": "affected" }, { "version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.6.120", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fb46d134e1b8690bed2da9005b36d32d2efd34ac" }, { "url": "https://git.kernel.org/stable/c/b5029e91c63406e4f4c8d58161048b41b6f0bd8c" }, { "url": "https://git.kernel.org/stable/c/ca1c29f05274b737dc964e28b97803750d7cf7ec" }, { "url": "https://git.kernel.org/stable/c/dbaa37e060918c45517786e37ecab0f300b48fa9" }, { "url": "https://git.kernel.org/stable/c/a846aecb931b4d65d5eafa92a0623545af46d4f2" } ], "title": "RDMA/irdma: Prevent rereg_mr for non-mem regions", "x_generator": { "engine": "bippy-1.2.0" } } } }