{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-31498",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-31498",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-04-22T13:54:19.714Z",
    "updatedAt": "2026-05-23T16:05:11.217Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop\n\nl2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED\nstate to support L2CAP reconfiguration (e.g. MTU changes). However,\nsince both CONF_INPUT_DONE and CONF_OUTPUT_DONE are already set from\nthe initial configuration, the reconfiguration path falls through to\nl2cap_ertm_init(), which re-initializes tx_q, srej_q, srej_list, and\nretrans_list without freeing the previous allocations and sets\nchan->sdu to NULL without freeing the existing skb. This leaks all\npreviously allocated ERTM resources.\n\nAdditionally, l2cap_parse_conf_req() does not validate the minimum\nvalue of remote_mps derived from the RFC max_pdu_size option. A zero\nvalue propagates to l2cap_segment_sdu() where pdu_len becomes zero,\ncausing the while loop to never terminate since len is never\ndecremented, exhausting all available memory.\n\nFix the double-init by skipping l2cap_ertm_init() and\nl2cap_chan_ready() when the channel is already in BT_CONNECTED state,\nwhile still allowing the reconfiguration parameters to be updated\nthrough l2cap_parse_conf_req(). Also add a pdu_len zero check in\nl2cap_segment_sdu() as a safeguard.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9760b83cfd24b38caee663f429011a0dd6064fa9"
            },
            {
              "version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "de37e2655b7abc3f59254c6b72256840f39fc6d5"
            },
            {
              "version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e7aab23b7df89a3d754a5f0a7d2237548b328bd0"
            },
            {
              "version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "52667c859fe33f70c2e711cb81bbd505d5eb8e75"
            },
            {
              "version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9a21a631ee034b1573dce14b572a24943dbfd7ae"
            },
            {
              "version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "900e4db5385ec2cacd372345a80ab9c8e105b3a3"
            },
            {
              "version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "042e2cd4bb11e5313b19b87593616524949e4c52"
            },
            {
              "version": "96298f640104e4cd9a913a6e50b0b981829b94ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "25f420a0d4cfd61d3d23ec4b9c56d9f443d91377"
            },
            {
              "version": "4ad03ff6f680681c5f78254e37c4c856fa953629",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "b7d0ca715c1008acd2fc018f02a56fed88f78b75",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "799263eb37a4f7f6d39334046929c3bc92452a7f",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "8828622fb9b4201eeb0870587052e3d834cfaf61",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "b432ea85ab8472763870dd0f2c186130dd36d68c",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4.4.238",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.5"
            },
            {
              "version": "4.9.238",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.10"
            },
            {
              "version": "4.14.200",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.15"
            },
            {
              "version": "4.19.149",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.20"
            },
            {
              "version": "5.4.69",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.5"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.7",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.7"
            },
            {
              "version": "5.10.253",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.203",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.168",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.131",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.80",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.21",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "6.19.11",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "version": "7.0",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}