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

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-05-11 22:07
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)
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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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:23:26Z",
      "cve": "CVE-2026-31393",
      "id": "CVE-2026-31393",
      "initial_release_date": "2026-04-03T23:25:56Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "201",
      "product_status:known_not_affected": "9",
      "product_status:recommended": "298",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31393",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31393.json",
      "version": "14"
    }
  }
}



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Taxonomy of the tags.





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.