CVE-2025-68362 (GCVE-0-2025-68362)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:32 – Updated: 2026-05-11 21:51
VLAI
Title
wifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c , < 118e12bf3e4288cf845cd3759bd9d4c99f91aab5 (git)
Affected: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c , < 6a96bd0d94305fd04a6ac64446ec113bae289384 (git)
Affected: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c , < e2f3ea15e804607e0a4a34a2f6c331c8750b68bc (git)
Affected: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c , < dc153401fb26c1640a2b279c47b65e1c416af276 (git)
Affected: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c , < 4758770a673c60d8f615809304d72e1432fa6355 (git)
Affected: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c , < 638d4148e166d114a4cd7becaae992ce1a815ed8 (git)
Affected: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c , < 5ebf0fe7eaef9f6173a4c6ea77c5353e21645d15 (git)
Affected: 6f7853f3cbe457067e9fe05461f56c7ea4ac488c , < b647d2574e4583c2e3b0ab35568f60c88e910840 (git)
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Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.63 , ≤ 6.12.* (semver)
Unaffected: 6.17.13 , ≤ 6.17.* (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c"
          ],
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          "vendor": "Linux",
          "versions": [
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            },
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              "status": "unaffected",
              "version": "0",
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver"
            },
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              "status": "unaffected",
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            },
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:51:44.272Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/118e12bf3e4288cf845cd3759bd9d4c99f91aab5"
        },
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          "url": "https://git.kernel.org/stable/c/6a96bd0d94305fd04a6ac64446ec113bae289384"
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          "url": "https://git.kernel.org/stable/c/b647d2574e4583c2e3b0ab35568f60c88e910840"
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      ],
      "title": "wifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68362",
    "datePublished": "2025-12-24T10:32:50.492Z",
    "dateReserved": "2025-12-16T14:48:05.307Z",
    "dateUpdated": "2026-05-11T21:51:44.272Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-05-28",
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      "percentile": "0.15421"
    },
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  }
}


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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.
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  • 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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