CVE-2024-46842 (GCVE-0-2024-46842)

Vulnerability from cvelistv5 – Published: 2024-09-27 12:39 – Updated: 2026-10-21 12:35
VLAI
Title
scsi: lpfc: Handle mailbox timeouts in lpfc_get_sfp_info
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Handle mailbox timeouts in lpfc_get_sfp_info The MBX_TIMEOUT return code is not handled in lpfc_get_sfp_info and the routine unconditionally frees submitted mailbox commands regardless of return status. The issue is that for MBX_TIMEOUT cases, when firmware returns SFP information at a later time, that same mailbox memory region references previously freed memory in its cmpl routine. Fix by adding checks for the MBX_TIMEOUT return code. During mailbox resource cleanup, check the mbox flag to make sure that the wait did not timeout. If the MBOX_WAKE flag is not set, then do not free the resources because it will be freed when firmware completes the mailbox at a later time in its cmpl routine. Also, increase the timeout from 30 to 60 seconds to accommodate boot scripts requiring longer timeouts.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-29 13:59 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6794 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 479b0917e4477f49df2e3be454aac3cfa5dec171 , < c6d8cce685d6088d795b29a0f47e6fd04548fd64 (git)
Affected: 479b0917e4477f49df2e3be454aac3cfa5dec171 , < bba47fe3b038cca3d3ebd799665ce69d6d273b58 (git)
Affected: 479b0917e4477f49df2e3be454aac3cfa5dec171 , < ede596b1434b57c0b3fd5c02b326efe5c54f6e48 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.10.10 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.160",
                      "versionStartIncluding": "6.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.10.10",
                      "versionStartIncluding": "6.2",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.11",
                      "versionStartIncluding": "6.2",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: lpfc: Handle mailbox timeouts in lpfc_get_sfp_info\n\nThe MBX_TIMEOUT return code is not handled in lpfc_get_sfp_info and the\nroutine unconditionally frees submitted mailbox commands regardless of\nreturn status.  The issue is that for MBX_TIMEOUT cases, when firmware\nreturns SFP information at a later time, that same mailbox memory region\nreferences previously freed memory in its cmpl routine.\n\nFix by adding checks for the MBX_TIMEOUT return code.  During mailbox\nresource cleanup, check the mbox flag to make sure that the wait did not\ntimeout.  If the MBOX_WAKE flag is not set, then do not free the resources\nbecause it will be freed when firmware completes the mailbox at a later\ntime in its cmpl routine.\n\nAlso, increase the timeout from 30 to 60 seconds to accommodate boot\nscripts requiring longer timeouts."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The only path to the vulnerable function is a read of the sysfs attribute /sys/class/scsi_host/hostN/lpfc_xcvr_data, which requires local system access. The remote FC RDP ELS path uses the separate async lpfc_get_rdp_info() and is not affected.\nAC:L - The attacker creates the timeout condition themselves: the sysfs handler has no serialization or rate limiting, and all mailbox commands are drained serially from an unbounded FIFO, so many concurrent readers push individual waits past the 30-second window. Timeouts are demonstrably reachable in ordinary operation, as the fix itself raises the timeout to 60s for boot scripts.\nPR:L - The attribute is declared DEVICE_ATTR_RO (mode 0444) in the unconditional lpfc_hba_attrs[] group, so any local unprivileged account can read it with no capability check in lpfc_xcvr_data_show(). Only a basic local user account is needed.\nUI:N - The attacker performs the sysfs read themselves; no victim action or cooperation is required.\nS:U - The corruption is confined to kernel heap and driver structures within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed LPFC_MBOXQ_t and its DMA buffer are recycled while the HBA still writes SFP page data into them, and the stale completion path reads pointers and a function pointer out of reallocated memory, giving a use-after-free read primitive over arbitrary reclaimed kernel objects.\nI:H - The mbox is memset and re-issued while still on psli-\u003emboxq (list corruption), then double-freed via mempool_free plus lpfc_sli4_mbox_cmd_free on reclaimed memory, yielding arbitrary-pointer free and an indirect call through mbox_cmpl read from attacker-groomed heap \u2014 exploitable for control-flow hijack.\nA:H - The use-after-free, double free, and doubly-linked-list corruption of the mailbox queue reliably produce an oops or panic, and the attacker can repeat the sysfs read to retrigger it at will."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-21T12:35:15.471Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/c6d8cce685d6088d795b29a0f47e6fd04548fd64"
            },
            {
              "url": "https://git.kernel.org/stable/c/bba47fe3b038cca3d3ebd799665ce69d6d273b58"
            },
            {
              "url": "https://git.kernel.org/stable/c/ede596b1434b57c0b3fd5c02b326efe5c54f6e48"
            }
          ],
          "title": "scsi: lpfc: Handle mailbox timeouts in lpfc_get_sfp_info",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-46842",
        "datePublished": "2024-09-27T12:39:36.370Z",
        "dateReserved": "2024-09-11T15:12:18.289Z",
        "dateUpdated": "2026-10-21T12:35:15.471Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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