CVE-2025-40118 (GCVE-0-2025-40118)
Vulnerability from cvelistv5
Published
2025-11-12 10:23
Modified
2026-08-05 12:07
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: pm80xx: Fix array-index-out-of-of-bounds on rmmod Since commit f7b705c238d1 ("scsi: pm80xx: Set phy_attached to zero when device is gone") UBSAN reports: UBSAN: array-index-out-of-bounds in drivers/scsi/pm8001/pm8001_sas.c:786:17 index 28 is out of range for type 'pm8001_phy [16]' on rmmod when using an expander. For a direct attached device, attached_phy contains the local phy id. For a device behind an expander, attached_phy contains the remote phy id, not the local phy id. I.e. while pm8001_ha will have pm8001_ha->chip->n_phy local phys, for a device behind an expander, attached_phy can be much larger than pm8001_ha->chip->n_phy (depending on the amount of phys of the expander). E.g. on my system pm8001_ha has 8 phys with phy ids 0-7. One of the ports has an expander connected. The expander has 31 phys with phy ids 0-30. The pm8001_ha->phy array only contains the phys of the HBA. It does not contain the phys of the expander. Thus, it is wrong to use attached_phy to index the pm8001_ha->phy array for a device behind an expander. Thus, we can only clear phy_attached for devices that are directly attached.
References
Impacted products
Vendor Product Version
Linux Linux Version: 05b512879eab41faa515b67fa3896d0005e97909
Version: bc2140c8136200b4437e1abc0fb659968cb9baab
Version: 1d8f9378cb4800c18e20d80ecd605b2b93e87a03
Version: 30e482dfb8f27d22f518695d4bcb5e7f4c6cb08a
Version: a862d24e1fc3ab1b5e5f20878d2898cea346d0ec
Version: 0f9802f174227f553959422f844eeb9ba72467fe
Version: f7b705c238d1483f0a766e2b20010f176e5c0fb7
Version: f7b705c238d1483f0a766e2b20010f176e5c0fb7
Version: 722026c010fa75bcf9e2373aff1d7930a3d7e3cf
Version: 5.4.293   ≤
Version: 5.10.237   ≤
Version: 5.15.181   ≤
Version: 6.1.136   ≤
Version: 6.6.89   ≤
Version: 6.12.26   ≤
Version: 6.14.5   ≤
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: pm80xx: Fix array-index-out-of-of-bounds on rmmod\n\nSince commit f7b705c238d1 (\"scsi: pm80xx: Set phy_attached to zero when\ndevice is gone\") UBSAN reports:\n\n  UBSAN: array-index-out-of-bounds in drivers/scsi/pm8001/pm8001_sas.c:786:17\n  index 28 is out of range for type \u0027pm8001_phy [16]\u0027\n\non rmmod when using an expander.\n\nFor a direct attached device, attached_phy contains the local phy id.\nFor a device behind an expander, attached_phy contains the remote phy\nid, not the local phy id.\n\nI.e. while pm8001_ha will have pm8001_ha-\u003echip-\u003en_phy local phys, for a\ndevice behind an expander, attached_phy can be much larger than\npm8001_ha-\u003echip-\u003en_phy (depending on the amount of phys of the\nexpander).\n\nE.g. on my system pm8001_ha has 8 phys with phy ids 0-7.  One of the\nports has an expander connected.  The expander has 31 phys with phy ids\n0-30.\n\nThe pm8001_ha-\u003ephy array only contains the phys of the HBA.  It does not\ncontain the phys of the expander.  Thus, it is wrong to use attached_phy\nto index the pm8001_ha-\u003ephy array for a device behind an expander.\n\nThus, we can only clear phy_attached for devices that are directly\nattached."
        }
      ],
      "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 out-of-bounds write is reached through local host operations on the pm80xx SAS HBA \u2014 system suspend (`pm8001_pci_suspend` \u2192 `sas_suspend_ha` \u2192 `sas_suspend_devices`), driver unbind/rmmod, or sysfs device delete \u2014 none of which cross a network boundary. A physical variant exists (hot-unplugging a drive on an expander phy \u2265 16), but the local suspend path is both reachable and more severe.\nAC:L - Once a SAS device is enumerated behind an expander with more than 16 phys \u2014 the standard 24/28/36-phy JBOD backplane configuration described in the commit \u2014 every suspend or removal event deterministically performs the OOB write, with no race to win and no unpredictable state required. The offending index is a stable property of the cabled topology, which the attacker can repeatedly re-trigger.\nPR:L - An unprivileged user with an active local session can invoke system suspend through the default logind/polkit policy, and `sas_suspend_devices()` calls `lldd_dev_gone` for every device on `port-\u003edev_list`, including expander children, driving the OOB write without any capability. No CAP_SYS_MODULE or root is needed on this path.\nUI:N - The attacker triggers suspend or device teardown directly; no separate victim needs to open a file, mount a filesystem, or take any action.\nS:U - The corruption is confined to kernel heap memory managed by the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - A controllable-offset out-of-bounds write into and beyond a large kmalloc\u0027d `pm8001_hba_info` object corrupts adjacent slab objects \u2014 zeroing a length, index, or pointer byte in a neighbouring structure is a standard route to over-read and kernel memory disclosure. Per kernel scoring guidance, memory corruption leveragable for info disclosure is High.\nI:H - This is a direct out-of-bounds write (`phy[idx].phy_attached = 0` with idx up to 127 into a 16-element array), landing in `asd_sas_port` list heads/spinlocks/pointers, the `devices`/`ccb_info` pointers, and ultimately in unrelated heap objects \u2014 a cross-object write primitive with attacker-influenced offset.\nA:H - The bug is confirmed by UBSAN as an array-index-out-of-bounds, and zeroing bytes of live `list_head`s, spinlocks, and kernel pointers reliably produces oopses, corrupted list traversal, or panic on the next use of the clobbered structure."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:07:55.038Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d94be0a6ae9ade706d4270e740bdb4f79953a7fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/45acbf154befedd9bc135f5e031fe7855d1e6493"
        },
        {
          "url": "https://git.kernel.org/stable/c/eef5ef400893f8e3dbb09342583be0cdc716d566"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c671d4dbfbfb0d73cfdfb706afb36d9ad60a582"
        },
        {
          "url": "https://git.kernel.org/stable/c/e62251954a128a2d0fcbc19e5fa39e08935bb628"
        },
        {
          "url": "https://git.kernel.org/stable/c/9326a1541e1b7ed3efdbab72061b82cf01c6477a"
        },
        {
          "url": "https://git.kernel.org/stable/c/83ced3c206c292458e47c7fac54223abc7141585"
        },
        {
          "url": "https://git.kernel.org/stable/c/251be2f6037fb7ab399f68cd7428ff274133d693"
        }
      ],
      "title": "scsi: pm80xx: Fix array-index-out-of-of-bounds on rmmod",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40118",
    "datePublished": "2025-11-12T10:23:18.179Z",
    "dateReserved": "2025-04-16T07:20:57.168Z",
    "dateUpdated": "2026-08-05T12:07:55.038Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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