CVE-2026-31393 (GCVE-0-2026-31393)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-08-05 12:22
VLAI
Title
Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access l2cap_information_rsp() checks that cmd_len covers the fixed l2cap_info_rsp header (type + result, 4 bytes) but then reads rsp->data without verifying that the payload is present: - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp->data), which reads 4 bytes past the header (needs cmd_len >= 8). - L2CAP_IT_FIXED_CHAN reads rsp->data[0], 1 byte past the header (needs cmd_len >= 5). A truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an out-of-bounds read of adjacent skb data. Guard each data access with the required payload length check. If the payload is too short, skip the read and let the state machine complete with safe defaults (feat_mask and remote_fixed_chan remain zero from kzalloc), so the info timer cleanup and l2cap_conn_start() still run and the connection is not stalled.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < 187e6fe939295be36063a1d91f8bebee04399a8c (git)
Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < 5229e7d15771eac2b5886bfb1f976aea0c1eec14 (git)
Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < 3b646516cba2ebc4b51a72954903326e7c1e443f (git)
Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < 807bd1258453c4c83f6ae9dbc1e7b44860ff40d0 (git)
Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < 9aeacde4da0f02d42fd968fd32f245828b230171 (git)
Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < e7ff754e339e3d5ce29aa9f95352d0186df8fbd9 (git)
Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < db2872d054e467810078e2b9f440a5b326a601b2 (git)
Affected: 4e8402a3f884427f9233ba436459c158d1f2e114 , < dd815e6e3918dc75a49aaabac36e4f024d675101 (git)
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Linux Linux Affected: 2.6.24
Unaffected: 0 , < 2.6.24 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "value": "AV:A - The vulnerable parser is reached by Bluetooth BR/EDR L2CAP signaling over an ACL link, so an attacker must be within Bluetooth radio range rather than on a routed IP network.\nAC:L - The attacker controls the malformed L2CAP_INFO_RSP payload and sees the kernel\u0027s request identifier before responding. No race or unusual condition beyond establishing the Bluetooth link is required.\nPR:N - The L2CAP information exchange occurs during connection setup before L2CAP channel security/authentication gates are enforced. A malicious adjacent Bluetooth peer does not need local credentials or kernel privileges on the victim.\nUI:N - In a reasonable connectable Bluetooth deployment, the peer can trigger the receive path by establishing or participating in an ACL/L2CAP connection. No victim user action is required for the malformed response itself.\nS:U - The bug is in the kernel Bluetooth stack and impacts kernel-managed resources in the same security authority. It does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The bug performs an out-of-bounds read from skb-adjacent data past the declared L2CAP_INFO_RSP payload. Under the required conservative scoring for kernel out-of-bounds reads, this is treated as high confidentiality impact.\nI:N - The flaw is an out-of-bounds read, not a write or type confusion primitive. It can corrupt protocol state selection, but does not provide a defensible arbitrary modification or code execution primitive.\nA:H - Reading past the valid skb data can trigger a kernel fault, KASAN report, oops, or panic on hardened/debug configurations. An adjacent peer can repeat the malformed response during connection setup, so availability impact is high."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2026-03-09T15:48:24.085Z",
    "dateUpdated": "2026-08-05T12:22:04.813Z",
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If the\\npayload is too short, skip the read and let the state machine complete\\nwith safe defaults (feat_mask and remote_fixed_chan remain zero from\\nkzalloc), so the info timer cleanup and l2cap_conn_start() still run\\nand the connection is not stalled.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nBluetooth: L2CAP: Validar la longitud de la carga \u00fatil de L2CAP_INFO_RSP antes del acceso\\n\\nl2cap_information_rsp() comprueba que cmd_len cubre la cabecera fija de l2cap_info_rsp (tipo + resultado, 4 bytes) pero luego lee rsp -\u003e data sin verificar que la carga \u00fatil est\u00e9 presente:\\n\\n - L2CAP_IT_FEAT_MASK llama a get_unaligned_le32(rsp -\u003e data), que lee 4 bytes despu\u00e9s de la cabecera (necesita cmd_len \u003e= 8).\\n\\n - L2CAP_IT_FIXED_CHAN lee rsp -\u003e data[0], 1 byte despu\u00e9s de la cabecera (necesita cmd_len \u003e= 5).\\n\\nUn L2CAP_INFO_RSP truncado con result == L2CAP_IR_SUCCESS desencadena una lectura fuera de l\u00edmites de datos skb adyacentes.\\n\\nProteger cada acceso a datos con la comprobaci\u00f3n de longitud de carga \u00fatil requerida. Si la carga \u00fatil es demasiado corta, omitir la lectura y permitir que la m\u00e1quina de estados se complete con valores predeterminados seguros (feat_mask y remote_fixed_chan permanecen en cero desde kzalloc), para que la limpieza del temporizador de informaci\u00f3n y l2cap_conn_start() sigan ejecut\u00e1ndose y la conexi\u00f3n no se estanque.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/l2cap_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4e8402a3f884427f9233ba436459c158d1f2e114\",\"lessThan\":\"187e6fe939295be36063a1d91f8bebee04399a8c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4e8402a3f884427f9233ba436459c158d1f2e114\",\"lessThan\":\"5229e7d15771eac2b5886bfb1f976aea0c1eec14\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4e8402a3f884427f9233ba436459c158d1f2e114\",\"lessThan\":\"3b646516cba2ebc4b51a72954903326e7c1e443f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4e8402a3f884427f9233ba436459c158d1f2e114\",\"lessThan\":\"807bd1258453c4c83f6ae9dbc1e7b44860ff40d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4e8402a3f884427f9233ba436459c158d1f2e114\",\"lessThan\":\"9aeacde4da0f02d42fd968fd32f245828b230171\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4e8402a3f884427f9233ba436459c158d1f2e114\",\"lessThan\":\"e7ff754e339e3d5ce29aa9f95352d0186df8fbd9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4e8402a3f884427f9233ba436459c158d1f2e114\",\"lessThan\":\"db2872d054e467810078e2b9f440a5b326a601b2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4e8402a3f884427f9233ba436459c158d1f2e114\",\"lessThan\":\"dd815e6e3918dc75a49aaabac36e4f024d675101\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/l2cap_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.24\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.24\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.253\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.203\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.167\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.130\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.78\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.20\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.10\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.24\",\"versionEndExcluding\":\"5.10.253\",\"matchCriteriaId\":\"23F88A56-E27D-46A7-B32C-65333C046B72\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.203\",\"matchCriteriaId\":\"20DDB3E9-AABF-4107-ADB0-5362AA067045\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.167\",\"matchCriteriaId\":\"2EDC6BAF-B710-4E26-B6AA-D68922EE7B43\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.130\",\"matchCriteriaId\":\"C57BB918-DF28-46B3-94F7-144176841267\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.78\",\"matchCriteriaId\":\"28D591F5-B196-4CC9-905C-DC80F116E7A8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.20\",\"matchCriteriaId\":\"E5571059-6552-48E7-9BEF-3E358C387171\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3: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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T11:46:39+00:00",
      "cve": "CVE-2026-31393",
      "id": "CVE-2026-31393",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31393.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.


Detection rules are retrieved from Rulezet.