FKIE_CVE-2025-68362

Vulnerability from fkie_nvd - Published: 2025-12-24 11:15 - Updated: 2026-06-17 09:59
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb() The rtl8187_rx_cb() calculates the rx descriptor header address by subtracting its size from the skb tail pointer. However, it does not validate if the received packet (skb->len from urb->actual_length) is large enough to contain this header. If a truncated packet is received, this will lead to a buffer underflow, reading memory before the start of the skb data area, and causing a kernel panic. Add length checks for both rtl8187 and rtl8187b descriptor headers before attempting to access them, dropping the packet cleanly if the check fails.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/118e12bf3e4288cf845cd3759bd9d4c99f91aab5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4758770a673c60d8f615809304d72e1432fa6355
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ebf0fe7eaef9f6173a4c6ea77c5353e21645d15
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/638d4148e166d114a4cd7becaae992ce1a815ed8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6a96bd0d94305fd04a6ac64446ec113bae289384
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b647d2574e4583c2e3b0ab35568f60c88e910840
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc153401fb26c1640a2b279c47b65e1c416af276
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2f3ea15e804607e0a4a34a2f6c331c8750b68bc
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "118e12bf3e4288cf845cd3759bd9d4c99f91aab5",
              "status": "affected",
              "version": "6f7853f3cbe457067e9fe05461f56c7ea4ac488c",
              "versionType": "git"
            },
            {
              "lessThan": "6a96bd0d94305fd04a6ac64446ec113bae289384",
              "status": "affected",
              "version": "6f7853f3cbe457067e9fe05461f56c7ea4ac488c",
              "versionType": "git"
            },
            {
              "lessThan": "e2f3ea15e804607e0a4a34a2f6c331c8750b68bc",
              "status": "affected",
              "version": "6f7853f3cbe457067e9fe05461f56c7ea4ac488c",
              "versionType": "git"
            },
            {
              "lessThan": "dc153401fb26c1640a2b279c47b65e1c416af276",
              "status": "affected",
              "version": "6f7853f3cbe457067e9fe05461f56c7ea4ac488c",
              "versionType": "git"
            },
            {
              "lessThan": "4758770a673c60d8f615809304d72e1432fa6355",
              "status": "affected",
              "version": "6f7853f3cbe457067e9fe05461f56c7ea4ac488c",
              "versionType": "git"
            },
            {
              "lessThan": "638d4148e166d114a4cd7becaae992ce1a815ed8",
              "status": "affected",
              "version": "6f7853f3cbe457067e9fe05461f56c7ea4ac488c",
              "versionType": "git"
            },
            {
              "lessThan": "5ebf0fe7eaef9f6173a4c6ea77c5353e21645d15",
              "status": "affected",
              "version": "6f7853f3cbe457067e9fe05461f56c7ea4ac488c",
              "versionType": "git"
            },
            {
              "lessThan": "b647d2574e4583c2e3b0ab35568f60c88e910840",
              "status": "affected",
              "version": "6f7853f3cbe457067e9fe05461f56c7ea4ac488c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.27"
            },
            {
              "lessThan": "2.6.27",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.248",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.63",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()\n\nThe rtl8187_rx_cb() calculates the rx descriptor header address\nby subtracting its size from the skb tail pointer.\nHowever, it does not validate if the received packet\n(skb-\u003elen from urb-\u003eactual_length) is large enough to contain this\nheader.\n\nIf a truncated packet is received, this will lead to a buffer\nunderflow, reading memory before the start of the skb data area,\nand causing a kernel panic.\n\nAdd length checks for both rtl8187 and rtl8187b descriptor headers\nbefore attempting to access them, dropping the packet cleanly if the\ncheck fails."
    }
  ],
  "id": "CVE-2025-68362",
  "lastModified": "2026-06-17T09:59:00.123",
  "metrics": {},
  "published": "2025-12-24T11:15:59.593",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/118e12bf3e4288cf845cd3759bd9d4c99f91aab5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4758770a673c60d8f615809304d72e1432fa6355"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5ebf0fe7eaef9f6173a4c6ea77c5353e21645d15"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/638d4148e166d114a4cd7becaae992ce1a815ed8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6a96bd0d94305fd04a6ac64446ec113bae289384"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b647d2574e4583c2e3b0ab35568f60c88e910840"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dc153401fb26c1640a2b279c47b65e1c416af276"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e2f3ea15e804607e0a4a34a2f6c331c8750b68bc"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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