CVE-2026-46177

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To avoid issues with BMCs that never say they are\ndone, add a limit of 10 fetches at a time.\n\nIn addition, an si interface has an attn state it can return from the\nhardware which is supposed to cause a flag fetch to see if the driver\nneeds to fetch events or message or a few other things. If the attn\nbit gets stuck, it's a similar problem. So allow messages in between\nflag fetches so the driver itself doesn't get stuck.\n\nThis is a more general fix than the previous fix for the specific bad\nBMC, but should fix the more general issue of a BMC that won't stop\nsaying it has data.\n\nThis has been there from the beginning of the driver. It's not a bug\nper-se, but it is accounting for bugs in BMCs."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The unbounded fetch loop is driven by the BMC's `RECEIVE_MSG_AVAIL`/`EVENT_MSG_BUFFER_FULL` flags; the receive-message queue is fed by `Send Message` commands that can arrive over IPMI-over-LAN (UDP/623, routable), and the BMC's own management network is the realistic remote entry point, so the host driver processes data originating from a remote peer.\nAC:L - The attacker reliably sustains the condition by continuously injecting messages into the SMS queue (or by controlling the BMC to keep the flag asserted); no uncontrolled race or specific memory layout is required.\nPR:N - No privileges on the vulnerable component (the host kernel) are required, and the remote/BMC-channel access often needs no real authentication (e.g. 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{}

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To avoid issues with BMCs that never say they are\ndone, add a limit of 10 fetches at a time.\n\nIn addition, an si interface has an attn state it can return from the\nhardware which is supposed to cause a flag fetch to see if the driver\nneeds to fetch events or message or a few other things. If the attn\nbit gets stuck, it's a similar problem. So allow messages in between\nflag fetches so the driver itself doesn't get stuck.\n\nThis is a more general fix than the previous fix for the specific bad\nBMC, but should fix the more general issue of a BMC that won't stop\nsaying it has data.\n\nThis has been there from the beginning of the driver. It's not a bug\nper-se, but it is accounting for bugs in BMCs."}], "id": "CVE-2026-46177", "lastModified": "2026-10-15T02:19:48.647", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-28T10:16:33.320", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/112df8e631636cafda64dcee4561daf09ce74a4a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/304b56883b7eff73eb606c35d062c8101aaf5471"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d37d2165df9504ea99d9e6181552dc4d2d1ab37"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/67c44e0deba936d5edaebea356b4589eb43acb5c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9059dc94421e1d4f8e5844204608b37ebfddb3da"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c024167fb00489baee08c72182ca2e7dc5fb9f20"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c4cca236968683eb0d59abfb12d5c7e4d8514227"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e20212b431bef217d3886b86bbc90cc3ed00de68"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ipmi: Add limits to event and receive message requests", "id": "2482539", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482539"}, "csaw": false, "cwe": "CWE-835", "details": ["A flaw was found in the Linux kernel's Intelligent Platform Management Interface (IPMI) driver. This vulnerability allows a malfunctioning Baseboard Management Controller (BMC) to cause the IPMI driver to continuously fetch events and messages, or become stuck if the attention bit remains active. This can lead to the driver becoming unresponsive, potentially resulting in a denial of service for the system."], "name": "CVE-2026-46177", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not 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-2026-46177\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46177\nhttps://lore.kernel.org/linux-cve-announce/2026052828-CVE-2026-46177-ead7@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,67c44e0deba936d5edaebea356b4589eb43acb5c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,e20212b431bef217d3886b86bbc90cc3ed00de68)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,3d37d2165df9504ea99d9e6181552dc4d2d1ab37)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,c024167fb00489baee08c72182ca2e7dc5fb9f20)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,c4cca236968683eb0d59abfb12d5c7e4d8514227)"}}], "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": "2.6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.140,7.0.0)"}}, {"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": "semver", "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": "2026-05-28T12:15:21.822732+00:00", "updated": "2026-06-10T22:45:27.817043+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}