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Bluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()

Type: advisorySource: Official CVE List1 source record

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).

Announced Source revision 1
Original source ↗

CVE-2026-98600

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98600

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "fb40eda15122f6b780228639c1ead6820340ff54",
        "lessThan": "76876fd26569302d26d91cbe8b75fa8e66cf8969",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3829af5fab5a22405bf1e7d69068c2ec0fce46ca",
        "lessThan": "97711b964877242933484989224a3c4c5d88a5ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b161eacd7fa4a2d765724b5504ac6cc388e48f80",
        "lessThan": "7a1781a2f3a9667b3065d402d1f11986a2363e08",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "30d1d9f3495463f7c026e4c553127f79b486fcd6",
        "lessThan": "c25587fa26761e623198b4f47151fe79d09ccde6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "67dc3b40fae71b6b11c71e7ff69bac0758818c05",
        "lessThan": "71ccacde407b7d8f0ef48974a0d2524602fd5c44",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bbc310caa2b6bf5fe42896ba27da0fbc12e4ac51",
        "lessThan": "be00deee60044ffa820f9436415caeb665b2cda0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b230e5bf501c5edaf2eb0991cb862ac142031d4b",
        "lessThan": "9240fc1f2cde5331c61608da21b00394602ca762",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b230e5bf501c5edaf2eb0991cb862ac142031d4b",
        "lessThan": "6d91041bb38b97e2feb625123cc0529d7b83a0e1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.12.111",
        "lessThan": "6.12.112",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.18.53",
        "lessThan": "6.18.55",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/bluetooth/rfcomm/core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "7.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "7.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/rfcomm/core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98600

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38620 · Revision 1
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Publisher date
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