CVE-2026-68419

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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", 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"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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68419", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:48:37.991046Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20 Improper Input Validation"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": 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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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "715fdb3b30541cc8180b7cdc6aa9f8c307afdf25", "lessThan": "fb46d134e1b8690bed2da9005b36d32d2efd34ac", "versionType": "git"}, {"status": "affected", "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "lessThan": "b5029e91c63406e4f4c8d58161048b41b6f0bd8c", "versionType": "git"}, {"status": "affected", "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "lessThan": "ca1c29f05274b737dc964e28b97803750d7cf7ec", "versionType": "git"}, {"status": "affected", "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "lessThan": "dbaa37e060918c45517786e37ecab0f300b48fa9", "versionType": "git"}, {"status": "affected", "version": 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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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.148", "versionStartIncluding": "6.6.120"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "6.7"}, 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/infiniband/hw/irdma/verbs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "fb46d134e1b8690bed2da9005b36d32d2efd34ac", "status": "affected", "version": "715fdb3b30541cc8180b7cdc6aa9f8c307afdf25", "versionType": "git"}, {"lessThan": "b5029e91c63406e4f4c8d58161048b41b6f0bd8c", "status": "affected", "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "versionType": "git"}, {"lessThan": "ca1c29f05274b737dc964e28b97803750d7cf7ec", "status": "affected", "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "versionType": "git"}, {"lessThan": "dbaa37e060918c45517786e37ecab0f300b48fa9", "status": "affected", "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "versionType": "git"}, {"lessThan": "a846aecb931b4d65d5eafa92a0623545af46d4f2", "status": "affected", "version": "5ac388db27c443dadfbb0b8b23fa7ccf429d901a", "versionType": "git"}, {"lessThan": "6.6.148", "status": "affected", "version": "6.6.120", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/infiniband/hw/irdma/verbs.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-68419", "lastModified": "2026-10-19T22:17:18.373", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68419", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:48:37.991046Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:35.730", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a846aecb931b4d65d5eafa92a0623545af46d4f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b5029e91c63406e4f4c8d58161048b41b6f0bd8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ca1c29f05274b737dc964e28b97803750d7cf7ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dbaa37e060918c45517786e37ecab0f300b48fa9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fb46d134e1b8690bed2da9005b36d32d2efd34ac"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: RDMA/irdma: Prevent rereg_mr for non-mem regions", "id": "2513475", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513475"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-791", "details": ["A flaw was found in the Linux kernel's RDMA/irdma component. A local user could exploit this by attempting to re-register specific memory regions (Queue Pair, Completion Queue, or Shared Receive Queue objects) that are not intended for re-registration. This could lead to an invalid operation being performed with a zero-initialized memory key, potentially causing system instability."], "name": "CVE-2026-68419", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68419\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68419\nhttps://lore.kernel.org/linux-cve-announce/2026081051-CVE-2026-68419-8aca@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[715fdb3b30541cc8180b7cdc6aa9f8c307afdf25,fb46d134e1b8690bed2da9005b36d32d2efd34ac)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5ac388db27c443dadfbb0b8b23fa7ccf429d901a,b5029e91c63406e4f4c8d58161048b41b6f0bd8c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5ac388db27c443dadfbb0b8b23fa7ccf429d901a,ca1c29f05274b737dc964e28b97803750d7cf7ec)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5ac388db27c443dadfbb0b8b23fa7ccf429d901a,dbaa37e060918c45517786e37ecab0f300b48fa9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5ac388db27c443dadfbb0b8b23fa7ccf429d901a,a846aecb931b4d65d5eafa92a0623545af46d4f2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.120,6.6.148)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T16:30:05.108360+00:00", "updated": "2026-10-20T10:45:13.769812+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}