CVE-2025-40189 (GCVE-0-2025-40189)

Vulnerability from cvelistv5 – Published: 2025-11-12 21:56 – Updated: 2025-12-01 06:19
VLAI?
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8b1b2ca83b200fa46fdfb81e80ad5fe34537e6d4 , < a72a7c4f675080a324d4c2167bd2314d968279f1 (git)
Affected: 8b1b2ca83b200fa46fdfb81e80ad5fe34537e6d4 , < 49bdb63ff64469a6de8ea901aef123c75be9bbe7 (git)
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    Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.17.4 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "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": [
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              "versionType": "git"
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "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",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "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": "2025-12-01T06:19:48.226Z",
        "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": "2025-12-01T06:19:48.226Z",
    "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\"}]}}"
  }
}


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  • 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.



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