CVE-2026-46177 (GCVE-0-2026-46177)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-08-05 12:30
VLAI
Title
ipmi: Add limits to event and receive message requests
Summary
In the Linux kernel, the following vulnerability has been resolved: ipmi: Add limits to event and receive message requests The driver would just fetch events and receive messages until the BMC said it was done. To avoid issues with BMCs that never say they are done, add a limit of 10 fetches at a time. In addition, an si interface has an attn state it can return from the hardware which is supposed to cause a flag fetch to see if the driver needs to fetch events or message or a few other things. If the attn bit gets stuck, it's a similar problem. So allow messages in between flag fetches so the driver itself doesn't get stuck. This is a more general fix than the previous fix for the specific bad BMC, but should fix the more general issue of a BMC that won't stop saying it has data. This has been there from the beginning of the driver. It's not a bug per-se, but it is accounting for bugs in BMCs.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 112df8e631636cafda64dcee4561daf09ce74a4a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 304b56883b7eff73eb606c35d062c8101aaf5471 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9059dc94421e1d4f8e5844204608b37ebfddb3da (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 67c44e0deba936d5edaebea356b4589eb43acb5c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e20212b431bef217d3886b86bbc90cc3ed00de68 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3d37d2165df9504ea99d9e6181552dc4d2d1ab37 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c024167fb00489baee08c72182ca2e7dc5fb9f20 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c4cca236968683eb0d59abfb12d5c7e4d8514227 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
  "containers": {
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            "version": "3.1"
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              "value": "AV:N - The unbounded fetch loop is driven by the BMC\u0027s `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\u0027s 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. cipher-0 bypass or default credentials are common), so this is treated as unauthenticated.\nUI:N - No host-user action is needed; the loop is triggered purely by BMC/peer-supplied flag and message state.\nS:U - The vulnerable component and the impacted resource are both the host kernel; no security authority boundary is crossed.\nC:N - The bug is a control-flow liveness issue with no out-of-bounds read or memory disclosure; fetched messages are well-formed and delivered normally.\nI:N - There is no memory corruption or data modification \u2014 nothing is written out of bounds or altered; the driver merely repeats legitimate fetches.\nA:H - The driver wedges in an unbounded fetch loop, never returning to idle, starving all other IPMI users and consuming a CPU/thread; an unserviceable IPMI watchdog can further escalate to a system reset."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:30:15.422Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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          "url": "https://git.kernel.org/stable/c/304b56883b7eff73eb606c35d062c8101aaf5471"
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      "title": "ipmi: Add limits to event and receive message requests",
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    "assignerShortName": "Linux",
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    "dateReserved": "2026-05-13T15:03:33.103Z",
    "dateUpdated": "2026-08-05T12:30:15.422Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-46177",
      "id": "msrc_CVE-2026-46177",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ipmi: Add limits to event and receive message requests",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46177.json",
      "version": "3"
    },
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So allow messages in between\\nflag fetches so the driver itself doesn\u0027t 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\u0027t stop\\nsaying it has data.\\n\\nThis has been there from the beginning of the driver.  It\u0027s not a bug\\nper-se, but it is accounting for bugs in BMCs.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/char/ipmi/ipmi_si_intf.c\",\"drivers/char/ipmi/ipmi_ssif.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"112df8e631636cafda64dcee4561daf09ce74a4a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"304b56883b7eff73eb606c35d062c8101aaf5471\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"9059dc94421e1d4f8e5844204608b37ebfddb3da\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"67c44e0deba936d5edaebea356b4589eb43acb5c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e20212b431bef217d3886b86bbc90cc3ed00de68\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"3d37d2165df9504ea99d9e6181552dc4d2d1ab37\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"c024167fb00489baee08c72182ca2e7dc5fb9f20\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"c4cca236968683eb0d59abfb12d5c7e4d8514227\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/char/ipmi/ipmi_si_intf.c\",\"drivers/char/ipmi/ipmi_ssif.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.88\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.30\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.7\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.12.1\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"E03287AA-1109-4662-85B8-5E824B2EA646\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.88\",\"matchCriteriaId\":\"5AFBE0EC-CCDF-4207-AE92-ABF958125CA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.30\",\"matchCriteriaId\":\"BF39AE08-AE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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:41:18+00:00",
      "cve": "CVE-2026-46177",
      "id": "CVE-2026-46177",
      "initial_release_date": "2026-05-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipmi: Add limits to event and receive message requests",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46177.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:54:40Z",
      "cve": "CVE-2026-46177",
      "id": "CVE-2026-46177",
      "initial_release_date": "2026-05-29T01:15:43Z",
      "product_status:known_affected": "205",
      "product_status:known_not_affected": "33",
      "product_status:recommended": "102",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46177",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46177.json",
      "version": "7"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.