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Also return 0 explicitly in the no-loopback-capability success\nbranch, and move dev->lb.mutex initialization to mlx5_ib_stage_init_init()."}], "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 - Reachable only via local ibverbs syscalls (ioctl/write) on /dev/infiniband/uverbsX through mlx5_ib_alloc_ucontext() and mlx5_ib_create_qp(); not via remote RoCE/IB packet handling.\nAC:L - An attacker can reliably open uverbs and create raw-packet QPs with self-loopback flags to invoke mlx5_ib_enable_lb(); TD leaks are repeatable by looping alloc_ucontext and can force enable_lb failure via memory pressure or firmware errors.\nPR:L - Kernel creates uverbs device nodes as world-accessible (0666); alloc_ucontext and create_qp require no real root/CAP_SYS_ADMIN, only local access to the mlx5 RDMA character device on hosts with the hardware.\nUI:N - Exploitation needs only attacker-driven ibverbs calls; no victim interaction such as mounting filesystems, clicking links, or opening files is required.\nS:U - Impact stays within the host kernel mlx5 RDMA driver scope; this is not a VM escape, IOMMU/DMA boundary bypass, or other cross-security-authority compromise per kernel CVSS guidance.\nC:H - Locking an uninitialized dev->lb.mutex in mlx5_ib_enable_lb()/disable_lb is undefined behavior that can corrupt kernel memory and be leveraged for arbitrary kernel memory disclosure.\nI:H - Uninitialized mutex use during ucontext transport-domain setup or raw-packet QP creation can corrupt adjacent kernel structures and enable arbitrary write or control-flow hijack primitives.\nA:H - Invalid mutex operations can kernel panic/oops; repeated alloc_ucontext without TD rollback on mlx5_ib_enable_lb() failure exhausts transport domains and denies further RDMA context/QP creation (DoS)."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/infiniband/hw/mlx5/main.c"], "versions": [{"version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "lessThan": "2c3b2667dad69d56774b79db763acb3a1bee0fc0", "status": "affected", "versionType": "git"}, {"version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "lessThan": "37fc3cc0f924fd8d0f0cf87b92672dec75a32e57", "status": "affected", "versionType": "git"}, {"version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "lessThan": "65e344925fa30abf50c8de8c150b397715fa2066", "status": "affected", "versionType": "git"}, {"version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "lessThan": "f88e12c95fc19f719e06ca1e9eb20fdad68ef61a", "status": "affected", "versionType": "git"}, {"version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "lessThan": "e79389115b9d27287ff6230a9750675106ed7668", "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/hw/mlx5/main.c"], "versions": [{"version": "4.5", "status": "affected"}, {"version": "0", "lessThan": "4.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "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": "4.5", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2c3b2667dad69d56774b79db763acb3a1bee0fc0"}, {"url": "https://git.kernel.org/stable/c/37fc3cc0f924fd8d0f0cf87b92672dec75a32e57"}, {"url": "https://git.kernel.org/stable/c/65e344925fa30abf50c8de8c150b397715fa2066"}, {"url": "https://git.kernel.org/stable/c/f88e12c95fc19f719e06ca1e9eb20fdad68ef61a"}, {"url": "https://git.kernel.org/stable/c/e79389115b9d27287ff6230a9750675106ed7668"}], "title": "IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74397", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:55:25.351057Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:41.192Z"}}]}}

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TD leaks are repeatable by looping alloc_ucontext and can force enable_lb failure via memory pressure or firmware errors.\nPR:L - Kernel creates uverbs device nodes as world-accessible (0666); alloc_ucontext and create_qp require no real root/CAP_SYS_ADMIN, only local access to the mlx5 RDMA character device on hosts with the hardware.\nUI:N - Exploitation needs only attacker-driven ibverbs calls; no victim interaction such as mounting filesystems, clicking links, or opening files is required.\nS:U - Impact stays within the host kernel mlx5 RDMA driver scope; this is not a VM escape, IOMMU/DMA boundary bypass, or other cross-security-authority compromise per kernel CVSS guidance.\nC:H - Locking an uninitialized dev->lb.mutex in mlx5_ib_enable_lb()/disable_lb is undefined behavior that can corrupt kernel memory and be leveraged for arbitrary kernel memory disclosure.\nI:H - Uninitialized mutex use during ucontext transport-domain setup or raw-packet QP creation can corrupt adjacent kernel structures and enable arbitrary write or control-flow hijack primitives.\nA:H - Invalid mutex operations can kernel panic/oops; repeated alloc_ucontext without TD rollback on mlx5_ib_enable_lb() failure exhausts transport domains and denies further RDMA context/QP creation (DoS)."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "lessThan": "2c3b2667dad69d56774b79db763acb3a1bee0fc0", "versionType": "git"}, {"status": "affected", "version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "lessThan": "37fc3cc0f924fd8d0f0cf87b92672dec75a32e57", "versionType": "git"}, {"status": "affected", "version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "lessThan": "65e344925fa30abf50c8de8c150b397715fa2066", "versionType": "git"}, {"status": "affected", "version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "lessThan": "f88e12c95fc19f719e06ca1e9eb20fdad68ef61a", "versionType": "git"}, {"status": "affected", "version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "lessThan": "e79389115b9d27287ff6230a9750675106ed7668", "versionType": "git"}], "programFiles": ["drivers/infiniband/hw/mlx5/main.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.5"}, {"status": "unaffected", "version": "0", "lessThan": "4.5", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "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/hw/mlx5/main.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/2c3b2667dad69d56774b79db763acb3a1bee0fc0"}, {"url": "https://git.kernel.org/stable/c/37fc3cc0f924fd8d0f0cf87b92672dec75a32e57"}, {"url": "https://git.kernel.org/stable/c/65e344925fa30abf50c8de8c150b397715fa2066"}, {"url": "https://git.kernel.org/stable/c/f88e12c95fc19f719e06ca1e9eb20fdad68ef61a"}, {"url": "https://git.kernel.org/stable/c/e79389115b9d27287ff6230a9750675106ed7668"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier\n\nmlx5_ib_alloc_transport_domain() allocates a transport domain and then\nmay fail in mlx5_ib_enable_lb(). 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/infiniband/hw/mlx5/main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2c3b2667dad69d56774b79db763acb3a1bee0fc0", "status": "affected", "version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "versionType": "git"}, {"lessThan": "37fc3cc0f924fd8d0f0cf87b92672dec75a32e57", "status": "affected", "version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "versionType": "git"}, {"lessThan": "65e344925fa30abf50c8de8c150b397715fa2066", "status": "affected", "version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "versionType": "git"}, {"lessThan": "f88e12c95fc19f719e06ca1e9eb20fdad68ef61a", "status": "affected", "version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "versionType": "git"}, {"lessThan": "e79389115b9d27287ff6230a9750675106ed7668", "status": "affected", "version": "146d2f1af3245a10b13eef263687e54f4e253d1d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/infiniband/hw/mlx5/main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.5"}, {"lessThan": "4.5", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "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\nIB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier\n\nmlx5_ib_alloc_transport_domain() allocates a transport domain and then\nmay fail in mlx5_ib_enable_lb(). In that case, the allocated TD is leaked.\n\nFix this by deallocating the TD when mlx5_ib_enable_lb() returns an\nerror. Also return 0 explicitly in the no-loopback-capability success\nbranch, and move dev->lb.mutex initialization to mlx5_ib_stage_init_init()."}], "id": "CVE-2026-74397", "lastModified": "2026-10-16T20:17:25.260", "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-2026-74397", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:55:25.351057Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:41.690", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c3b2667dad69d56774b79db763acb3a1bee0fc0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37fc3cc0f924fd8d0f0cf87b92672dec75a32e57"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/65e344925fa30abf50c8de8c150b397715fa2066"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e79389115b9d27287ff6230a9750675106ed7668"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f88e12c95fc19f719e06ca1e9eb20fdad68ef61a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier", "id": "2516780", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516780"}, "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-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nIB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier\nmlx5_ib_alloc_transport_domain() allocates a transport domain and then\nmay fail in mlx5_ib_enable_lb(). In that case, the allocated TD is leaked.\nFix this by deallocating the TD when mlx5_ib_enable_lb() returns an\nerror. Also return 0 explicitly in the no-loopback-capability success\nbranch, and move dev->lb.mutex initialization to mlx5_ib_stage_init_init().", "A flaw was found in the Linux kernel's InfiniBand (IB) Mellanox 5 (mlx5) driver. This vulnerability occurs when the driver allocates a transport domain but fails to properly deallocate it if a subsequent operation encounters an error. This oversight leads to a resource leak, which could potentially cause system instability or a denial of service due to resource exhaustion."], "name": "CVE-2026-74397", "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-2026-74397\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74397\nhttps://lore.kernel.org/linux-cve-announce/2026081508-CVE-2026-74397-f360@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[146d2f1af3245a10b13eef263687e54f4e253d1d,2c3b2667dad69d56774b79db763acb3a1bee0fc0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[146d2f1af3245a10b13eef263687e54f4e253d1d,37fc3cc0f924fd8d0f0cf87b92672dec75a32e57)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[146d2f1af3245a10b13eef263687e54f4e253d1d,65e344925fa30abf50c8de8c150b397715fa2066)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[146d2f1af3245a10b13eef263687e54f4e253d1d,f88e12c95fc19f719e06ca1e9eb20fdad68ef61a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[146d2f1af3245a10b13eef263687e54f4e253d1d,e79389115b9d27287ff6230a9750675106ed7668)"}}], "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": "generic", "value": "4.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "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": "2026-08-15T17:30:11.723735+00:00", "updated": "2026-08-21T23:30:17.189191+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-401", "CWE-772"]}