CVE-2026-74334

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To avoid disturbing all the\nhappy paths, add an rdma_restrack_sync() operation which is sort of like\nflush_workqueue() or synchronize_irq(): after it returns, all the old\nnldev touches to the mr are gone and everything sees the new PD. This\nmakes it safe to reach into the PD pointer."}], "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 bug is reached via local NETLINK_RDMA nldev MR resource dumps and concurrent IB_USER_VERBS_CMD_REREG_MR ioctl on /dev/infiniband/uverbs; it is not triggered by remote RDMA/InfiniBand/RoCE network traffic.\nAC:L - An attacker controls both race sides by spawning threads that hammer rereg_mr with IB_MR_REREG_PD and nldev RES_MR_GET dumps, optionally deallocating the old PD; no timing or layout conditions outside attacker control are required.\nPR:L - Exploitation needs only local uverbs access (device nodes default 0666) plus NETLINK_RDMA dumps; CAP_NET_ADMIN for netlink send is obtainable by unprivileged users via user namespaces, not real init-namespace root.\nUI:N - No victim interaction is required; the attacker triggers both the rereg_mr PD change and the concurrent nldev MR dump from their own process.\nS:U - Impact is kernel heap corruption and privilege escalation within the host kernel security boundary, not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - Concurrent rereg_mr can free the old ib_pd while nldev still dereferences mr->pd for device and res.id, creating a use-after-free that enables arbitrary kernel memory disclosure via controlled reuse of freed slab objects.\nI:H - The ib_pd UAF is exploitable for heap grooming and arbitrary kernel write or control-flow hijack, not merely a bounded data corruption or guaranteed crash.\nA:H - The race reliably causes kernel oops or panic from dereferencing a freed ib_pd during nldev dumps, and UAF exploitation can additionally crash or hang the system during heap manipulation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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no timing or layout conditions outside attacker control are required.\nPR:L - Exploitation needs only local uverbs access (device nodes default 0666) plus NETLINK_RDMA dumps; CAP_NET_ADMIN for netlink send is obtainable by unprivileged users via user namespaces, not real init-namespace root.\nUI:N - No victim interaction is required; the attacker triggers both the rereg_mr PD change and the concurrent nldev MR dump from their own process.\nS:U - Impact is kernel heap corruption and privilege escalation within the host kernel security boundary, not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - Concurrent rereg_mr can free the old ib_pd while nldev still dereferences mr->pd for device and res.id, creating a use-after-free that enables arbitrary kernel memory disclosure via controlled reuse of freed slab objects.\nI:H - The ib_pd UAF is exploitable for heap grooming and arbitrary kernel write or control-flow hijack, not merely a bounded data corruption or guaranteed crash.\nA:H - The race reliably causes kernel oops or panic from dereferencing a freed ib_pd during nldev dumps, and UAF exploitation can additionally crash or hang the system during heap manipulation."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "lessThan": "845c6b355226195dad1f26b300c4830f57034e8b", "versionType": "git"}, {"status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "lessThan": "7a0cbb5721a1da81e902d73b6049f85ca8f3fc0a", "versionType": "git"}, {"status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "lessThan": "05e26f34597e9c38bb5b340d86b179b23673869f", "versionType": "git"}, {"status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "lessThan": "a07cba1296aaa81bf9b914486ca957aaff196247", "versionType": "git"}, {"status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "lessThan": "1a132ee4e655288d9a0937ea5109a0d038431ae9", "versionType": "git"}, {"status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "lessThan": "50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3", "versionType": "git"}], "programFiles": ["drivers/infiniband/core/nldev.c", "drivers/infiniband/core/restrack.c", "drivers/infiniband/core/restrack.h", "drivers/infiniband/core/uverbs_cmd.c", "include/rdma/ib_verbs.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.18"}, {"status": "unaffected", "version": "0", "lessThan": "4.18", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.110", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.52", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/infiniband/core/nldev.c", "drivers/infiniband/core/restrack.c", "drivers/infiniband/core/restrack.h", "drivers/infiniband/core/uverbs_cmd.c", "include/rdma/ib_verbs.h"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/845c6b355226195dad1f26b300c4830f57034e8b"}, {"url": "https://git.kernel.org/stable/c/7a0cbb5721a1da81e902d73b6049f85ca8f3fc0a"}, {"url": "https://git.kernel.org/stable/c/05e26f34597e9c38bb5b340d86b179b23673869f"}, {"url": "https://git.kernel.org/stable/c/a07cba1296aaa81bf9b914486ca957aaff196247"}, {"url": "https://git.kernel.org/stable/c/1a132ee4e655288d9a0937ea5109a0d038431ae9"}, {"url": "https://git.kernel.org/stable/c/50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/nldev: Fix locking when accessing mr->pd\n\nSashiko points out that, due to rereg_mr, the PD is actually variable and\nall the touches in nldev are racy.\n\nUse mr->device instead of mr->pd->device.\n\nGetting the PD restrack ID is more tricky. To avoid disturbing all the\nhappy paths, add an rdma_restrack_sync() operation which is sort of like\nflush_workqueue() or synchronize_irq(): after it returns, all the old\nnldev touches to the mr are gone and everything sees the new PD. This\nmakes it safe to reach into the PD pointer."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.188", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.157", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.110", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.52", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "4.18"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-14T11:58:43.928Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74334", "state": "PUBLISHED", "dateUpdated": "2026-10-16T18:55:33.821Z", "dateReserved": "2026-08-15T05:44:03.885Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:58:26.455Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/infiniband/core/nldev.c", "drivers/infiniband/core/restrack.c", "drivers/infiniband/core/restrack.h", "drivers/infiniband/core/uverbs_cmd.c", "include/rdma/ib_verbs.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "845c6b355226195dad1f26b300c4830f57034e8b", "status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "versionType": "git"}, {"lessThan": "7a0cbb5721a1da81e902d73b6049f85ca8f3fc0a", "status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "versionType": "git"}, {"lessThan": "05e26f34597e9c38bb5b340d86b179b23673869f", "status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "versionType": "git"}, {"lessThan": "a07cba1296aaa81bf9b914486ca957aaff196247", "status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "versionType": "git"}, {"lessThan": "1a132ee4e655288d9a0937ea5109a0d038431ae9", "status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "versionType": "git"}, {"lessThan": "50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3", "status": "affected", "version": "da5c8507821573b8ed6e3f47e009f273493ffaf7", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/infiniband/core/nldev.c", "drivers/infiniband/core/restrack.c", "drivers/infiniband/core/restrack.h", "drivers/infiniband/core/uverbs_cmd.c", "include/rdma/ib_verbs.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.18"}, {"lessThan": "4.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "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/nldev: Fix locking when accessing mr->pd\n\nSashiko points out that, due to rereg_mr, the PD is actually variable and\nall the touches in nldev are racy.\n\nUse mr->device instead of mr->pd->device.\n\nGetting the PD restrack ID is more tricky. To avoid disturbing all the\nhappy paths, add an rdma_restrack_sync() operation which is sort of like\nflush_workqueue() or synchronize_irq(): after it returns, all the old\nnldev touches to the mr are gone and everything sees the new PD. This\nmakes it safe to reach into the PD pointer."}], "id": "CVE-2026-74334", "lastModified": "2026-10-16T19:17:40.110", "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-2026-74334", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:53:49.608601Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:34.280", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/05e26f34597e9c38bb5b340d86b179b23673869f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1a132ee4e655288d9a0937ea5109a0d038431ae9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7a0cbb5721a1da81e902d73b6049f85ca8f3fc0a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/845c6b355226195dad1f26b300c4830f57034e8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a07cba1296aaa81bf9b914486ca957aaff196247"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: RDMA/nldev: Fix locking when accessing mr->pd", "id": "2516807", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516807"}, "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-366", "details": ["A flaw was found in the RDMA/nldev component of the Linux kernel. Improper locking during memory region re-registration (rereg_mr) can lead to a race condition when accessing protection domains (PD). This vulnerability could result in unpredictable system behavior or a denial of service due to concurrent, unsynchronized memory access."], "name": "CVE-2026-74334", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74334\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74334\nhttps://lore.kernel.org/linux-cve-announce/2026081556-CVE-2026-74334-dadf@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[da5c8507821573b8ed6e3f47e009f273493ffaf7,1a132ee4e655288d9a0937ea5109a0d038431ae9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[da5c8507821573b8ed6e3f47e009f273493ffaf7,50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3)"}}], "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": "4.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc1,*]"}}], "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": "2026-08-15T13:00:05.629128+00:00", "updated": "2026-08-22T01:30:17.269209+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}