CVE-2026-98600 (GCVE-0-2026-98600)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:19 – Updated: 2026-10-19 09:22
VLAI
Title
Bluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame() While rfcomm_recv_frame() verifies that skb->len is at least sizeof(*hdr) + 1 (4 bytes: 3-byte header + 1-byte FCS), an RFCOMM frame with an extended 2-byte length field (!__test_ea(hdr->len)) has a 4-byte header plus a 1-byte FCS (5 bytes minimum, sizeof(*hdr) + 2). When a 4-byte RFCOMM frame with EA == 0 arrives: 1. The initial skb->len < sizeof(*hdr) + 1 check passes (4 < 4 is false). 2. Trimming the FCS byte decrements skb->len to 3. 3. If __check_fcs() succeeds, skb_pull(skb, 4) fails (4 > 3) and returns NULL without advancing skb->data. 4. Because the return value of skb_pull() is ignored, the un-pulled 3-byte struct rfcomm_hdr remains at skb->data and is either queued as application payload via rfcomm_recv_data() or parsed as a multiplexer control command via rfcomm_recv_mcc() on DLCI 0. Fix this by extending the length check in rfcomm_recv_frame() to also require skb->len >= sizeof(*hdr) + 2 when !__test_ea(hdr->len).
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fb40eda15122f6b780228639c1ead6820340ff54 , < 76876fd26569302d26d91cbe8b75fa8e66cf8969 (git)
Affected: 3829af5fab5a22405bf1e7d69068c2ec0fce46ca , < 97711b964877242933484989224a3c4c5d88a5ee (git)
Affected: b161eacd7fa4a2d765724b5504ac6cc388e48f80 , < 7a1781a2f3a9667b3065d402d1f11986a2363e08 (git)
Affected: 30d1d9f3495463f7c026e4c553127f79b486fcd6 , < c25587fa26761e623198b4f47151fe79d09ccde6 (git)
Affected: 67dc3b40fae71b6b11c71e7ff69bac0758818c05 , < 71ccacde407b7d8f0ef48974a0d2524602fd5c44 (git)
Affected: bbc310caa2b6bf5fe42896ba27da0fbc12e4ac51 , < be00deee60044ffa820f9436415caeb665b2cda0 (git)
Affected: b230e5bf501c5edaf2eb0991cb862ac142031d4b , < 9240fc1f2cde5331c61608da21b00394602ca762 (git)
Affected: b230e5bf501c5edaf2eb0991cb862ac142031d4b , < 6d91041bb38b97e2feb625123cc0529d7b83a0e1 (git)
Affected: 6.12.111 , < 6.12.112 (semver)
Affected: 6.18.53 , < 6.18.55 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 7.2
Unaffected: 0 , < 7.2 (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()\n\nWhile rfcomm_recv_frame() verifies that skb-\u003elen is at least\nsizeof(*hdr) + 1 (4 bytes: 3-byte header + 1-byte FCS), an RFCOMM frame\nwith an extended 2-byte length field (!__test_ea(hdr-\u003elen)) has a 4-byte\nheader plus a 1-byte FCS (5 bytes minimum, sizeof(*hdr) + 2).\n\nWhen a 4-byte RFCOMM frame with EA == 0 arrives:\n1. The initial skb-\u003elen \u003c sizeof(*hdr) + 1 check passes (4 \u003c 4 is false).\n2. Trimming the FCS byte decrements skb-\u003elen to 3.\n3. If __check_fcs() succeeds, skb_pull(skb, 4) fails (4 \u003e 3) and returns\n   NULL without advancing skb-\u003edata.\n4. Because the return value of skb_pull() is ignored, the un-pulled\n   3-byte struct rfcomm_hdr remains at skb-\u003edata and is either queued as\n   application payload via rfcomm_recv_data() or parsed as a multiplexer\n   control command via rfcomm_recv_mcc() on DLCI 0.\n\nFix this by extending the length check in rfcomm_recv_frame() to also\nrequire skb-\u003elen \u003e= sizeof(*hdr) + 2 when !__test_ea(hdr-\u003elen)."
        }
      ],
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/6d91041bb38b97e2feb625123cc0529d7b83a0e1"
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      ],
      "title": "Bluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()",
      "x_generator": {
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    "datePublished": "2026-10-18T15:19:12.864Z",
    "dateReserved": "2026-09-25T10:25:14.359Z",
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()\n\nWhile rfcomm_recv_frame() verifies that skb-\u003elen is at least\nsizeof(*hdr) + 1 (4 bytes: 3-byte header + 1-byte FCS), an RFCOMM frame\nwith an extended 2-byte length field (!__test_ea(hdr-\u003elen)) has a 4-byte\nheader plus a 1-byte FCS (5 bytes minimum, sizeof(*hdr) + 2).\n\nWhen a 4-byte RFCOMM frame with EA == 0 arrives:\n1. The initial skb-\u003elen \u003c sizeof(*hdr) + 1 check passes (4 \u003c 4 is false).\n2. Trimming the FCS byte decrements skb-\u003elen to 3.\n3. If __check_fcs() succeeds, skb_pull(skb, 4) fails (4 \u003e 3) and returns\n   NULL without advancing skb-\u003edata.\n4. Because the return value of skb_pull() is ignored, the un-pulled\n   3-byte struct rfcomm_hdr remains at skb-\u003edata and is either queued as\n   application payload via rfcomm_recv_data() or parsed as a multiplexer\n   control command via rfcomm_recv_mcc() on DLCI 0.\n\nFix this by extending the length check in rfcomm_recv_frame() to also\nrequire skb-\u003elen \u003e= sizeof(*hdr) + 2 when !__test_ea(hdr-\u003elen)."
          }
        ],
        "id": "CVE-2026-98600",
        "lastModified": "2026-10-19T10:19:21.517",
        "metrics": {},
        "published": "2026-10-18T16:17:12.707",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-10-20T05:18:50+00:00",
      "cve": "CVE-2026-98600",
      "id": "CVE-2026-98600",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "263",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98600.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-10-18T23:44:52Z",
      "cve": "CVE-2026-98600",
      "id": "CVE-2026-98600",
      "initial_release_date": "2026-10-18T23:44:52Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98600",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98600.json",
      "version": "2"
    }
  }
}



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