CVE-2025-40189 (GCVE-0-2025-40189)
Vulnerability from cvelistv5
Published
2025-11-12 21:56
Modified
2025-11-12 21:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: usb: lan78xx: Fix lost EEPROM read timeout error(-ETIMEDOUT) in lan78xx_read_raw_eeprom Syzbot reported read of uninitialized variable BUG with following call stack. lan78xx 8-1:1.0 (unnamed net_device) (uninitialized): EEPROM read operation timeout ===================================================== BUG: KMSAN: uninit-value in lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1095 [inline] BUG: KMSAN: uninit-value in lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline] BUG: KMSAN: uninit-value in lan78xx_reset+0x999/0x2cd0 drivers/net/usb/lan78xx.c:3241 lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1095 [inline] lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline] lan78xx_reset+0x999/0x2cd0 drivers/net/usb/lan78xx.c:3241 lan78xx_bind+0x711/0x1690 drivers/net/usb/lan78xx.c:3766 lan78xx_probe+0x225c/0x3310 drivers/net/usb/lan78xx.c:4707 Local variable sig.i.i created at: lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1092 [inline] lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline] lan78xx_reset+0x77e/0x2cd0 drivers/net/usb/lan78xx.c:3241 lan78xx_bind+0x711/0x1690 drivers/net/usb/lan78xx.c:3766 The function lan78xx_read_raw_eeprom failed to properly propagate EEPROM read timeout errors (-ETIMEDOUT). In the fallthrough path, it first attempted to restore the pin configuration for LED outputs and then returned only the status of that restore operation, discarding the original timeout error. As a result, callers could mistakenly treat the data buffer as valid even though the EEPROM read had actually timed out with no data or partial data. To fix this, handle errors in restoring the LED pin configuration separately. If the restore succeeds, return any prior EEPROM timeout error correctly to the caller.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8b1b2ca83b200fa46fdfb81e80ad5fe34537e6d4
Version: 8b1b2ca83b200fa46fdfb81e80ad5fe34537e6d4
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/lan78xx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a72a7c4f675080a324d4c2167bd2314d968279f1",
              "status": "affected",
              "version": "8b1b2ca83b200fa46fdfb81e80ad5fe34537e6d4",
              "versionType": "git"
            },
            {
              "lessThan": "49bdb63ff64469a6de8ea901aef123c75be9bbe7",
              "status": "affected",
              "version": "8b1b2ca83b200fa46fdfb81e80ad5fe34537e6d4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/lan78xx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.4",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18-rc1",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: lan78xx: Fix lost EEPROM read timeout error(-ETIMEDOUT) in lan78xx_read_raw_eeprom\n\nSyzbot reported read of uninitialized variable BUG with following call stack.\n\nlan78xx 8-1:1.0 (unnamed net_device) (uninitialized): EEPROM read operation timeout\n=====================================================\nBUG: KMSAN: uninit-value in lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1095 [inline]\nBUG: KMSAN: uninit-value in lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline]\nBUG: KMSAN: uninit-value in lan78xx_reset+0x999/0x2cd0 drivers/net/usb/lan78xx.c:3241\n lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1095 [inline]\n lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline]\n lan78xx_reset+0x999/0x2cd0 drivers/net/usb/lan78xx.c:3241\n lan78xx_bind+0x711/0x1690 drivers/net/usb/lan78xx.c:3766\n lan78xx_probe+0x225c/0x3310 drivers/net/usb/lan78xx.c:4707\n\nLocal variable sig.i.i created at:\n lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1092 [inline]\n lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline]\n lan78xx_reset+0x77e/0x2cd0 drivers/net/usb/lan78xx.c:3241\n lan78xx_bind+0x711/0x1690 drivers/net/usb/lan78xx.c:3766\n\nThe function lan78xx_read_raw_eeprom failed to properly propagate EEPROM\nread timeout errors (-ETIMEDOUT). In the fallthrough path, it first\nattempted to restore the pin configuration for LED outputs and then\nreturned only the status of that restore operation, discarding the\noriginal timeout error.\n\nAs a result, callers could mistakenly treat the data buffer as valid\neven though the EEPROM read had actually timed out with no data or partial\ndata.\n\nTo fix this, handle errors in restoring the LED pin configuration separately.\nIf the restore succeeds, return any prior EEPROM timeout error correctly\nto the caller."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-11-12T21:56:30.575Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a72a7c4f675080a324d4c2167bd2314d968279f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/49bdb63ff64469a6de8ea901aef123c75be9bbe7"
        }
      ],
      "title": "net: usb: lan78xx: Fix lost EEPROM read timeout error(-ETIMEDOUT) in lan78xx_read_raw_eeprom",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40189",
    "datePublished": "2025-11-12T21:56:30.575Z",
    "dateReserved": "2025-04-16T07:20:57.177Z",
    "dateUpdated": "2025-11-12T21:56:30.575Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40189\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-12T22:15:45.833\",\"lastModified\":\"2025-11-14T16:42:30.503\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: usb: lan78xx: Fix lost EEPROM read timeout error(-ETIMEDOUT) in lan78xx_read_raw_eeprom\\n\\nSyzbot reported read of uninitialized variable BUG with following call stack.\\n\\nlan78xx 8-1:1.0 (unnamed net_device) (uninitialized): EEPROM read operation timeout\\n=====================================================\\nBUG: KMSAN: uninit-value in lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1095 [inline]\\nBUG: KMSAN: uninit-value in lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline]\\nBUG: KMSAN: uninit-value in lan78xx_reset+0x999/0x2cd0 drivers/net/usb/lan78xx.c:3241\\n lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1095 [inline]\\n lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline]\\n lan78xx_reset+0x999/0x2cd0 drivers/net/usb/lan78xx.c:3241\\n lan78xx_bind+0x711/0x1690 drivers/net/usb/lan78xx.c:3766\\n lan78xx_probe+0x225c/0x3310 drivers/net/usb/lan78xx.c:4707\\n\\nLocal variable sig.i.i created at:\\n lan78xx_read_eeprom drivers/net/usb/lan78xx.c:1092 [inline]\\n lan78xx_init_mac_address drivers/net/usb/lan78xx.c:1937 [inline]\\n lan78xx_reset+0x77e/0x2cd0 drivers/net/usb/lan78xx.c:3241\\n lan78xx_bind+0x711/0x1690 drivers/net/usb/lan78xx.c:3766\\n\\nThe function lan78xx_read_raw_eeprom failed to properly propagate EEPROM\\nread timeout errors (-ETIMEDOUT). In the fallthrough path, it first\\nattempted to restore the pin configuration for LED outputs and then\\nreturned only the status of that restore operation, discarding the\\noriginal timeout error.\\n\\nAs a result, callers could mistakenly treat the data buffer as valid\\neven though the EEPROM read had actually timed out with no data or partial\\ndata.\\n\\nTo fix this, handle errors in restoring the LED pin configuration separately.\\nIf the restore succeeds, return any prior EEPROM timeout error correctly\\nto the caller.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/49bdb63ff64469a6de8ea901aef123c75be9bbe7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a72a7c4f675080a324d4c2167bd2314d968279f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • 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.