CVE-2025-22031 (GCVE-0-2025-22031)
Vulnerability from cvelistv5
Published
2025-04-16 14:11
Modified
2025-05-26 05:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI/bwctrl: Fix NULL pointer dereference on bus number exhaustion When BIOS neglects to assign bus numbers to PCI bridges, the kernel attempts to correct that during PCI device enumeration. If it runs out of bus numbers, no pci_bus is allocated and the "subordinate" pointer in the bridge's pci_dev remains NULL. The PCIe bandwidth controller erroneously does not check for a NULL subordinate pointer and dereferences it on probe. Bandwidth control of unusable devices below the bridge is of questionable utility, so simply error out instead. This mirrors what PCIe hotplug does since commit 62e4492c3063 ("PCI: Prevent NULL dereference during pciehp probe"). The PCI core emits a message with KERN_INFO severity if it has run out of bus numbers. PCIe hotplug emits an additional message with KERN_ERR severity to inform the user that hotplug functionality is disabled at the bridge. A similar message for bandwidth control does not seem merited, given that its only purpose so far is to expose an up-to-date link speed in sysfs and throttle the link speed on certain laptops with limited Thermal Design Power. So error out silently. User-visible messages: pci 0000:16:02.0: bridge configuration invalid ([bus 00-00]), reconfiguring [...] pci_bus 0000:45: busn_res: [bus 45-74] end is updated to 74 pci 0000:16:02.0: devices behind bridge are unusable because [bus 45-74] cannot be assigned for them [...] pcieport 0000:16:02.0: pciehp: Hotplug bridge without secondary bus, ignoring [...] BUG: kernel NULL pointer dereference RIP: pcie_update_link_speed pcie_bwnotif_enable pcie_bwnotif_probe pcie_port_probe_service really_probe
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1181924af78e5299ddec6e457789c02dd5966559Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/667f053b05f00a007738cd7ed6fa1901de19dc7ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d93d309013e89631630a12b1770d27e4be78362aPatch
Impacted products
Vendor Product Version
Linux Linux Version: 665745f274870c921020f610e2c99a3b1613519b
Version: 665745f274870c921020f610e2c99a3b1613519b
Version: 665745f274870c921020f610e2c99a3b1613519b
 Create a notification for this product.
   Linux Linux Version: 6.13
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/pcie/bwctrl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d93d309013e89631630a12b1770d27e4be78362a",
              "status": "affected",
              "version": "665745f274870c921020f610e2c99a3b1613519b",
              "versionType": "git"
            },
            {
              "lessThan": "1181924af78e5299ddec6e457789c02dd5966559",
              "status": "affected",
              "version": "665745f274870c921020f610e2c99a3b1613519b",
              "versionType": "git"
            },
            {
              "lessThan": "667f053b05f00a007738cd7ed6fa1901de19dc7e",
              "status": "affected",
              "version": "665745f274870c921020f610e2c99a3b1613519b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/pcie/bwctrl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.11",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.2",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/bwctrl: Fix NULL pointer dereference on bus number exhaustion\n\nWhen BIOS neglects to assign bus numbers to PCI bridges, the kernel\nattempts to correct that during PCI device enumeration.  If it runs out\nof bus numbers, no pci_bus is allocated and the \"subordinate\" pointer in\nthe bridge\u0027s pci_dev remains NULL.\n\nThe PCIe bandwidth controller erroneously does not check for a NULL\nsubordinate pointer and dereferences it on probe.\n\nBandwidth control of unusable devices below the bridge is of questionable\nutility, so simply error out instead.  This mirrors what PCIe hotplug does\nsince commit 62e4492c3063 (\"PCI: Prevent NULL dereference during pciehp\nprobe\").\n\nThe PCI core emits a message with KERN_INFO severity if it has run out of\nbus numbers.  PCIe hotplug emits an additional message with KERN_ERR\nseverity to inform the user that hotplug functionality is disabled at the\nbridge.  A similar message for bandwidth control does not seem merited,\ngiven that its only purpose so far is to expose an up-to-date link speed\nin sysfs and throttle the link speed on certain laptops with limited\nThermal Design Power.  So error out silently.\n\nUser-visible messages:\n\n  pci 0000:16:02.0: bridge configuration invalid ([bus 00-00]), reconfiguring\n  [...]\n  pci_bus 0000:45: busn_res: [bus 45-74] end is updated to 74\n  pci 0000:16:02.0: devices behind bridge are unusable because [bus 45-74] cannot be assigned for them\n  [...]\n  pcieport 0000:16:02.0: pciehp: Hotplug bridge without secondary bus, ignoring\n  [...]\n  BUG: kernel NULL pointer dereference\n  RIP: pcie_update_link_speed\n  pcie_bwnotif_enable\n  pcie_bwnotif_probe\n  pcie_port_probe_service\n  really_probe"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:16:58.335Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d93d309013e89631630a12b1770d27e4be78362a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1181924af78e5299ddec6e457789c02dd5966559"
        },
        {
          "url": "https://git.kernel.org/stable/c/667f053b05f00a007738cd7ed6fa1901de19dc7e"
        }
      ],
      "title": "PCI/bwctrl: Fix NULL pointer dereference on bus number exhaustion",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22031",
    "datePublished": "2025-04-16T14:11:51.264Z",
    "dateReserved": "2024-12-29T08:45:45.808Z",
    "dateUpdated": "2025-05-26T05:16:58.335Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-22031\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-16T15:15:55.710\",\"lastModified\":\"2025-04-29T18:57:00.353\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nPCI/bwctrl: Fix NULL pointer dereference on bus number exhaustion\\n\\nWhen BIOS neglects to assign bus numbers to PCI bridges, the kernel\\nattempts to correct that during PCI device enumeration.  If it runs out\\nof bus numbers, no pci_bus is allocated and the \\\"subordinate\\\" pointer in\\nthe bridge\u0027s pci_dev remains NULL.\\n\\nThe PCIe bandwidth controller erroneously does not check for a NULL\\nsubordinate pointer and dereferences it on probe.\\n\\nBandwidth control of unusable devices below the bridge is of questionable\\nutility, so simply error out instead.  This mirrors what PCIe hotplug does\\nsince commit 62e4492c3063 (\\\"PCI: Prevent NULL dereference during pciehp\\nprobe\\\").\\n\\nThe PCI core emits a message with KERN_INFO severity if it has run out of\\nbus numbers.  PCIe hotplug emits an additional message with KERN_ERR\\nseverity to inform the user that hotplug functionality is disabled at the\\nbridge.  A similar message for bandwidth control does not seem merited,\\ngiven that its only purpose so far is to expose an up-to-date link speed\\nin sysfs and throttle the link speed on certain laptops with limited\\nThermal Design Power.  So error out silently.\\n\\nUser-visible messages:\\n\\n  pci 0000:16:02.0: bridge configuration invalid ([bus 00-00]), reconfiguring\\n  [...]\\n  pci_bus 0000:45: busn_res: [bus 45-74] end is updated to 74\\n  pci 0000:16:02.0: devices behind bridge are unusable because [bus 45-74] cannot be assigned for them\\n  [...]\\n  pcieport 0000:16:02.0: pciehp: Hotplug bridge without secondary bus, ignoring\\n  [...]\\n  BUG: kernel NULL pointer dereference\\n  RIP: pcie_update_link_speed\\n  pcie_bwnotif_enable\\n  pcie_bwnotif_probe\\n  pcie_port_probe_service\\n  really_probe\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: PCI/bwctrl: Correcci\u00f3n de la desreferencia de puntero nulo al agotar el n\u00famero de bus. Cuando la BIOS no asigna n\u00fameros de bus a los puentes PCI, el kernel intenta corregirlo durante la enumeraci\u00f3n de dispositivos PCI. Si se agotan los n\u00fameros de bus, no se asigna ning\u00fan pci_bus y el puntero \\\"subordinado\\\" en el pci_dev del puente permanece nulo. El controlador de ancho de banda PCIe no busca err\u00f3neamente un puntero subordinado nulo y lo desreferencia al sondear. El control del ancho de banda de los dispositivos inutilizables debajo del puente es de dudosa utilidad, por lo que simplemente se genera un error. Esto refleja lo que hace PCIe hotplug desde el commit 62e4492c3063 (\\\"PCI: Evitar la desreferencia de puntero nulo durante el sondeo pciehp\\\"). El n\u00facleo PCI emite un mensaje con severidad KERN_INFO si se agotan los n\u00fameros de bus. PCIe hotplug emite un mensaje adicional con severidad KERN_ERR para informar al usuario que la funci\u00f3n hotplug est\u00e1 deshabilitada en el puente. Un mensaje similar para el control del ancho de banda no parece justificado, dado que su \u00fanico prop\u00f3sito hasta ahora es mostrar una velocidad de enlace actualizada en sysfs y limitarla en ciertas computadoras port\u00e1tiles con potencia de dise\u00f1o t\u00e9rmico limitada. Por lo tanto, el error se emite silenciosamente. Mensajes visibles para el usuario: pci 0000:16:02.0: configuraci\u00f3n de puente no v\u00e1lida ([bus 00-00]), reconfigurando [...] pci_bus 0000:45: busn_res: el extremo [bus 45-74] se actualiza a 74 pci 0000:16:02.0: los dispositivos detr\u00e1s del puente no se pueden usar porque no se puede asignar [bus 45-74] para ellos [...] pcieport 0000:16:02.0: pciehp: Puente hot-plug sin bus secundario, ignorando [...] ERROR: desreferencia de puntero NULL del kernel RIP: pcie_update_link_speed pcie_bwnotif_enable pcie_bwnotif_probe pcie_port_probe_service really_probe\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.11\",\"matchCriteriaId\":\"E7E864B0-8C00-4679-BA55-659B4C9C3AD3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.14\",\"versionEndExcluding\":\"6.14.2\",\"matchCriteriaId\":\"FADAE5D8-4808-442C-B218-77B2CE8780A0\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1181924af78e5299ddec6e457789c02dd5966559\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/667f053b05f00a007738cd7ed6fa1901de19dc7e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d93d309013e89631630a12b1770d27e4be78362a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.