CVE-2026-72045 (GCVE-0-2026-72045)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-23 12:46
VLAI
Title
octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF
Summary
In the Linux kernel, the following vulnerability has been resolved: octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF rvu_mbox_handler_lmtst_tbl_setup() uses req->base_pcifunc as a direct index into the LMT map table to read another function's LMTLINE physical base address and copy it into the caller's own LMT map table entry. The mailbox dispatcher authenticates req->hdr.pcifunc from the IRQ source, but req->base_pcifunc is a separate payload field and is not sanitized. Reject the request with -EPERM when a VF caller's base_pcifunc is not a valid function under its own PF. is_pf_func_valid() bounds the FUNC field to the PF's configured VF count, keeping the computed index inside the caller's own slot block.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 893ae97214c385be02f8ec097298cc48c7f0d905 , < 04c014e49b9f53d58a8f94adece8a0af3ae1b85c (git)
Affected: 893ae97214c385be02f8ec097298cc48c7f0d905 , < 6967dd944be2a71eddab3a2ae1a1a4dd9e5f8eed (git)
Affected: 893ae97214c385be02f8ec097298cc48c7f0d905 , < e9c5b03208507dd6d58b0c23a2c60b5c2f4c1b11 (git)
Affected: 893ae97214c385be02f8ec097298cc48c7f0d905 , < 54535692bec9ef464adc714108eb19e49e38b5a2 (git)
Affected: 893ae97214c385be02f8ec097298cc48c7f0d905 , < c73b8795b45f4ad5a95120d2e9b435ea4616e08e (git)
Affected: 893ae97214c385be02f8ec097298cc48c7f0d905 , < 59da37fee81a8d76079313348ca13c5bc90dd6ae (git)
Affected: 893ae97214c385be02f8ec097298cc48c7f0d905 , < 8cdcf3d2caacdee7ddd363705fb4d93b0c1a0915 (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
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            "drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocteontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF\n\nrvu_mbox_handler_lmtst_tbl_setup() uses req-\u003ebase_pcifunc as a direct\nindex into the LMT map table to read another function\u0027s LMTLINE\nphysical base address and copy it into the caller\u0027s own LMT map table\nentry. The mailbox dispatcher authenticates req-\u003ehdr.pcifunc from the\nIRQ source, but req-\u003ebase_pcifunc is a separate payload field and is\nnot sanitized.\n\nReject the request with -EPERM when a VF caller\u0027s base_pcifunc is not a\nvalid function under its own PF. is_pf_func_valid() bounds the FUNC field\nto the PF\u0027s configured VF count, keeping the computed index inside the\ncaller\u0027s own slot block."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local control of an assigned Marvell CN10K/OCTEONTX2 SR-IOV VF and sending a crafted LMTST_TBL_SETUP mailbox message over the PCI VF\u2192AF control path (rvu_afvf_mbox_handler\u2192rvu_mbox_handler_lmtst_tbl_setup); it is not reachable via remote packet delivery.\nAC:L - Once a VF is assigned, the attacker fully controls the unsanitized base_pcifunc payload field and can trigger the flaw deterministically with a single mailbox message; no race, special memory layout, or victim timing is required.\nPR:L - Only control of an assigned VF is needed (typical cloud/tenant VM or container with SR-IOV passthrough, or guest root/CAP_NET_ADMIN managing the VF); host init-namespace root is not required and unprivileged host users cannot reach this hardware mailbox without the VF device.\nUI:N - No victim user action is required; the attacker directly sends the malicious LMTST_TBL_SETUP mailbox request from their VF to the AF handler.\nS:C - A malicious VF tenant can retarget hardware LMTLINE stores to another PF/VF\u0027s memory region, crossing the SR-IOV tenant isolation boundary and enabling guest-to-host or guest-to-guest impact on shared CN10K NIC deployments.\nC:H - Redirecting a VF\u0027s LMT map entry to another function\u0027s LMTLINE region lets the attacker read victim in-flight packet/crypto submission metadata and buffer pointers from shared hardware LMT memory, constituting cross-tenant information disclosure beyond the attacker\u0027s scope.\nI:H - After the map-table redirect, the attacker\u0027s LMTST flush operations (packet TX SQE submission, NPA aura free, CPT enqueue) are hardware-written into the victim\u0027s LMTLINE physical pages, enabling arbitrary cross-tenant memory corruption and potential control of victim I/O submission state.\nA:H - Corrupting another PF/VF\u0027s LMTLINE submission buffers can crash or hang the victim\u0027s networking/crypto stack (guest kernel oops/panic or persistent TX failure) and the attack can be repeated on demand by resending mailbox requests."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:33.156Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/8cdcf3d2caacdee7ddd363705fb4d93b0c1a0915"
        }
      ],
      "title": "octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF",
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    "assignerShortName": "Linux",
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    "datePublished": "2026-08-15T05:52:04.038Z",
    "dateReserved": "2026-08-09T03:40:39.902Z",
    "dateUpdated": "2026-08-23T12:46:33.156Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-08-24",
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The mailbox dispatcher authenticates req-\u003ehdr.pcifunc from the\\nIRQ source, but req-\u003ebase_pcifunc is a separate payload field and is\\nnot sanitized.\\n\\nReject the request with -EPERM when a VF caller\u0027s base_pcifunc is not a\\nvalid function under its own PF. is_pf_func_valid() bounds the FUNC field\\nto the PF\u0027s configured VF count, keeping the computed index inside the\\ncaller\u0027s own slot block.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"893ae97214c385be02f8ec097298cc48c7f0d905\",\"lessThan\":\"04c014e49b9f53d58a8f94adece8a0af3ae1b85c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"893ae97214c385be02f8ec097298cc48c7f0d905\",\"lessThan\":\"6967dd944be2a71eddab3a2ae1a1a4dd9e5f8eed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"893ae97214c385be02f8ec097298cc48c7f0d905\",\"lessThan\":\"e9c5b03208507dd6d58b0c23a2c60b5c2f4c1b11\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"893ae97214c385be02f8ec097298cc48c7f0d905\",\"lessThan\":\"54535692bec9ef464adc714108eb19e49e38b5a2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"893ae97214c385be02f8ec097298cc48c7f0d905\",\"lessThan\":\"c73b8795b45f4ad5a95120d2e9b435ea4616e08e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"893ae97214c385be02f8ec097298cc48c7f0d905\",\"lessThan\":\"59da37fee81a8d76079313348ca13c5bc90dd6ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"893ae97214c385be02f8ec097298cc48c7f0d905\",\"lessThan\":\"8cdcf3d2caacdee7ddd363705fb4d93b0c1a0915\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/04c014e49b9f53d58a8f94adece8a0af3ae1b85c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54535692bec9ef464adc714108eb19e49e38b5a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/59da37fee81a8d76079313348ca13c5bc90dd6ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6967dd944be2a71eddab3a2ae1a1a4dd9e5f8eed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8cdcf3d2caacdee7ddd363705fb4d93b0c1a0915\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c73b8795b45f4ad5a95120d2e9b435ea4616e08e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e9c5b03208507dd6d58b0c23a2c60b5c2f4c1b11\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T18:15:00+00:00",
      "cve": "CVE-2026-72045",
      "id": "CVE-2026-72045",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72045.json",
      "version": "3"
    }
  }
}



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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.