CVE-2026-46176

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When\nib_create_srq() fails for s1, the error branch destroys s0 but falls\nthrough and unconditionally assigns the freed s0 and the ERR_PTR s1 to\ndevr->s0 and devr->s1.\n\nThis leads to several problems: the lock-free fast path checks\n\"if (devr->s1) return 0;\" and treats the ERR_PTR as already initialised;\nusers in mlx5_ib_create_qp() dereference the freed SRQ or ERR_PTR via\nto_msrq(devr->s0)->msrq.srqn; and mlx5_ib_dev_res_cleanup() dereferences\nthe ERR_PTR and double-frees s0 on teardown.\n\nFix by adding the same `goto unlock` in the s1 failure path."}], "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 vulnerable resource-init runs on QP creation, reached locally via the RDMA uverbs character device (default mode 0666); there is no remote packet that autonomously triggers this, as QP creation is a local operation. (In-kernel RDMA targets allow adjacent triggering but cannot induce the required failure, so local is the strongest path.)\nAC:L - A local attacker can reliably force the s1 failure by first exhausting the device's firmware SRQ resources via user-space SRQ creation (which does not trigger the res-init), then creating a QP so s0 succeeds but s1 fails; the broken state then persists for the device lifetime.\nPR:L - Opening the uverbs device (default 0666) and creating a basic QP/SRQ requires only an unprivileged local user with RDMA access (common in HPC/RDMA deployments) and no special capability.\nUI:N - The attacker performs the resource exhaustion and QP creation entirely on their own; no victim action is required.\nS:U - The use-after-free, double-free, and wild-pointer dereference are all confined to the kernel's own security authority with no crossing of a privilege/IOMMU/hypervisor boundary.\nC:H - The freed SRQ s0 is dereferenced as to_msrq(devr->s0)->msrq.srqn on every later QP creation; after reclaiming the freed slab with controlled data the attacker reads attacker-influenced freed memory, a classic UAF disclosure primitive.\nI:H - The bug yields a use-after-free plus a double-free of the SRQ object (destroyed in the error path, then again at cleanup), giving heap-allocator corruption and write primitives via heap grooming.\nA:H - The ERR_PTR stored in devr->s1 is dereferenced on the next QP creation (and at cleanup), and the freed s0 is reused, producing a guaranteed kernel oops/panic."}]}], "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": "b6334d2356fc0922ed01457960f74923058a353a", "lessThan": "a13c2ac4d480b734342c6fbf8249fc48afd675f3", "status": "affected", "versionType": "git"}, {"version": "5895e70f2e6e8dc67b551ca554d6fcde0a7f0467", "lessThan": 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(In-kernel RDMA targets allow adjacent triggering but cannot induce the required failure, so local is the strongest path.)\nAC:L - A local attacker can reliably force the s1 failure by first exhausting the device's firmware SRQ resources via user-space SRQ creation (which does not trigger the res-init), then creating a QP so s0 succeeds but s1 fails; the broken state then persists for the device lifetime.\nPR:L - Opening the uverbs device (default 0666) and creating a basic QP/SRQ requires only an unprivileged local user with RDMA access (common in HPC/RDMA deployments) and no special capability.\nUI:N - The attacker performs the resource exhaustion and QP creation entirely on their own; no victim action is required.\nS:U - The use-after-free, double-free, and wild-pointer dereference are all confined to the kernel's own security authority with no crossing of a privilege/IOMMU/hypervisor boundary.\nC:H - The freed SRQ s0 is dereferenced as to_msrq(devr->s0)->msrq.srqn on every later QP creation; after reclaiming the freed slab with controlled data the attacker reads attacker-influenced freed memory, a classic UAF disclosure primitive.\nI:H - The bug yields a use-after-free plus a double-free of the SRQ object (destroyed in the error path, then again at cleanup), giving heap-allocator corruption and write primitives via heap grooming.\nA:H - The ERR_PTR stored in devr->s1 is dereferenced on the next QP creation (and at cleanup), and the freed s0 is reused, producing a guaranteed kernel oops/panic."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "b6334d2356fc0922ed01457960f74923058a353a", "lessThan": "a13c2ac4d480b734342c6fbf8249fc48afd675f3", "versionType": "git"}, {"status": "affected", "version": "5895e70f2e6e8dc67b551ca554d6fcde0a7f0467", "lessThan": "bc2cf5935b4665172235341163315905197ae91d", "versionType": "git"}, {"status": "affected", "version": "5895e70f2e6e8dc67b551ca554d6fcde0a7f0467", "lessThan": "b087913ae88256df66620f7ba0a9776716aeef7e", "versionType": "git"}, {"status": "affected", "version": "5895e70f2e6e8dc67b551ca554d6fcde0a7f0467", "lessThan": "6fd93142dd1d09000c3750af08270f5792523fe9", "versionType": "git"}, {"status": "affected", "version": "5895e70f2e6e8dc67b551ca554d6fcde0a7f0467", "lessThan": "c488df06bd552bb8b6e14fa0cfd5ad986c6e9525", "versionType": "git"}, {"status": "affected", "version": "6.6.64", "lessThan": "6.6.140", "versionType": "semver"}], "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": "6.11"}, {"status": "unaffected", "version": "0", "lessThan": "6.11", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.140", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.88", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.30", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.7", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/infiniband/hw/mlx5/main.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/a13c2ac4d480b734342c6fbf8249fc48afd675f3"}, {"url": "https://git.kernel.org/stable/c/bc2cf5935b4665172235341163315905197ae91d"}, {"url": "https://git.kernel.org/stable/c/b087913ae88256df66620f7ba0a9776716aeef7e"}, {"url": "https://git.kernel.org/stable/c/6fd93142dd1d09000c3750af08270f5792523fe9"}, {"url": "https://git.kernel.org/stable/c/c488df06bd552bb8b6e14fa0cfd5ad986c6e9525"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init()\n\nmlx5_ib_dev_res_srq_init() allocates two SRQs, s0 and s1. When\nib_create_srq() fails for s1, the error branch destroys s0 but falls\nthrough and unconditionally assigns the freed s0 and the ERR_PTR s1 to\ndevr->s0 and devr->s1.\n\nThis leads to several problems: the lock-free fast path checks\n\"if (devr->s1) return 0;\" and treats the ERR_PTR as already initialised;\nusers in mlx5_ib_create_qp() dereference the freed SRQ or ERR_PTR via\nto_msrq(devr->s0)->msrq.srqn; and mlx5_ib_dev_res_cleanup() dereferences\nthe ERR_PTR and double-frees s0 on teardown.\n\nFix by adding the same `goto unlock` in the s1 failure path."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.140", "versionStartIncluding": "6.6.64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.88", "versionStartIncluding": "6.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.30", "versionStartIncluding": "6.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.7", "versionStartIncluding": "6.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "6.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:14.340Z"}}}, "cveMetadata": {"cveId": "CVE-2026-46176", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:36:53.745Z", "dateReserved": "2026-05-13T15:03:33.103Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-28T09:36:30.398Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"versionEndExcluding": "7.0.7", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init()\n\nmlx5_ib_dev_res_srq_init() allocates two SRQs, s0 and s1. When\nib_create_srq() fails for s1, the error branch destroys s0 but falls\nthrough and unconditionally assigns the freed s0 and the ERR_PTR s1 to\ndevr->s0 and devr->s1.\n\nThis leads to several problems: the lock-free fast path checks\n\"if (devr->s1) return 0;\" and treats the ERR_PTR as already initialised;\nusers in mlx5_ib_create_qp() dereference the freed SRQ or ERR_PTR via\nto_msrq(devr->s0)->msrq.srqn; and mlx5_ib_dev_res_cleanup() dereferences\nthe ERR_PTR and double-frees s0 on teardown.\n\nFix by adding the same `goto unlock` in the s1 failure path."}], "id": "CVE-2026-46176", "lastModified": "2026-10-19T20:18:36.600", "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"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46176", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:20:46.473667Z", "version": "2.0.3"}}]}, "published": "2026-05-28T10:16:33.220", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6fd93142dd1d09000c3750af08270f5792523fe9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a13c2ac4d480b734342c6fbf8249fc48afd675f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b087913ae88256df66620f7ba0a9776716aeef7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bc2cf5935b4665172235341163315905197ae91d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c488df06bd552bb8b6e14fa0cfd5ad986c6e9525"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:30848"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:33215"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:33685"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:34094"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-46176"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482594"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46176.json"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-825"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-825"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: RDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init()", "id": "2482594", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482594"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's RDMA/mlx5 component. An error path fall-through in the `mlx5_ib_dev_res_srq_init()` function, specifically when `ib_create_srq()` fails, can lead to the use of freed memory and error pointers. This memory corruption vulnerability could result in system instability, denial of service, or potentially arbitrary code execution."], "name": "CVE-2026-46176", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46176\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46176\nhttps://lore.kernel.org/linux-cve-announce/2026052828-CVE-2026-46176-a4db@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b6334d2356fc0922ed01457960f74923058a353a,a13c2ac4d480b734342c6fbf8249fc48afd675f3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5895e70f2e6e8dc67b551ca554d6fcde0a7f0467,bc2cf5935b4665172235341163315905197ae91d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5895e70f2e6e8dc67b551ca554d6fcde0a7f0467,b087913ae88256df66620f7ba0a9776716aeef7e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5895e70f2e6e8dc67b551ca554d6fcde0a7f0467,6fd93142dd1d09000c3750af08270f5792523fe9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5895e70f2e6e8dc67b551ca554d6fcde0a7f0467,c488df06bd552bb8b6e14fa0cfd5ad986c6e9525)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.64,6.6.140)"}}], "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": "6.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.140,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.88,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.30,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.7,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc3,*]"}}], "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": "2026-05-28T12:15:21.822975+00:00", "updated": "2026-06-10T22:45:27.819292+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}