CVE-2026-23395 (GCVE-0-2026-23395)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:33 – Updated: 2026-05-11 22:06
VLAI
Title
Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ Currently the code attempts to accept requests regardless of the command identifier which may cause multiple requests to be marked as pending (FLAG_DEFER_SETUP) which can cause more than L2CAP_ECRED_MAX_CID(5) to be allocated in l2cap_ecred_rsp_defer causing an overflow. The spec is quite clear that the same identifier shall not be used on subsequent requests: 'Within each signaling channel a different Identifier shall be used for each successive request or indication.' https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/host/logical-link-control-and-adaptation-protocol-specification.html#UUID-32a25a06-4aa4-c6c7-77c5-dcfe3682355d So this attempts to check if there are any channels pending with the same identifier and rejects if any are found.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 10a7a702542240d5edb2b39450ac951c59ccd009 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 46e5b71666fb7652082e4e214a3365f4b14f1dc3 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < fb4a3a26483f3ea2cd21c7a2f7c45d5670600465 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 2124d82fd25e1671bb3ceb37998af5aae5903e06 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 6b949a6b33cbdf621d9fc6f0c48ac00915dbf514 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 8d0d94f8ba5b3a0beec3b0da558b9bea48018117 (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < e72ee455297b794b852e5cea8d2d7bb17312172a (git)
Affected: 15f02b91056253e8cdc592888f431da0731337b8 , < 5b3e2052334f2ff6d5200e952f4aa66994d09899 (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (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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cada canal de se\u00f1alizaci\u00f3n se utilizar\u00e1 un identificador diferente para cada solicitud o indicaci\u00f3n sucesiva.\u0027\\nhttps://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/host/logical-link-control-and-adaptation-protocol-specification.html#UUID-32a25a06-4aa4-c6c7-77c5-dcfe3682355d\\n\\nAs\u00ed que esto intenta verificar si hay canales pendientes con el mismo identificador y los rechaza si se encuentra alguno.\"}],\"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\":\"15f02b91056253e8cdc592888f431da0731337b8\",\"lessThan\":\"10a7a702542240d5edb2b39450ac951c59ccd009\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15f02b91056253e8cdc592888f431da0731337b8\",\"lessThan\":\"46e5b71666fb7652082e4e214a3365f4b14f1dc3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15f02b91056253e8cdc592888f431da0731337b8\",\"lessThan\":\"fb4a3a26483f3ea2cd21c7a2f7c45d5670600465\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15f02b91056253e8cdc592888f431da0731337b8\",\"lessThan\":\"2124d82fd25e1671bb3ceb37998af5aae5903e06\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15f02b91056253e8cdc592888f431da0731337b8\",\"lessThan\":\"6b949a6b33cbdf621d9fc6f0c48ac00915dbf514\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15f02b91056253e8cdc592888f431da0731337b8\",\"lessThan\":\"8d0d94f8ba5b3a0beec3b0da558b9bea48018117\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15f02b91056253e8cdc592888f431da0731337b8\",\"lessThan\":\"e72ee455297b794b852e5cea8d2d7bb17312172a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"15f02b91056253e8cdc592888f431da0731337b8\",\"lessThan\":\"5b3e2052334f2ff6d5200e952f4aa66994d09899\",\"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\":\"5.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.7\",\"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:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.7.1\",\"versionEndExcluding\":\"5.10.253\",\"matchCriteriaId\":\"44827F4D-4242-412D-B59A-6D9F5FC547B1\"},{\"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-DF28-46B3-94F7-1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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T17:12:40+00:00",
      "cve": "CVE-2026-23395",
      "id": "CVE-2026-23395",
      "initial_release_date": "2026-03-25T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23395.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T00:21:34Z",
      "cve": "CVE-2026-23395",
      "id": "CVE-2026-23395",
      "initial_release_date": "2026-03-25T16:54:49Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "559",
      "product_status:known_not_affected": "110",
      "product_status:recommended": "295",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23395",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23395.json",
      "version": "34"
    }
  }
}



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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.