GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-80761 (GCVE-0-2026-80761)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:12 – Updated: 2026-09-04 15:12
VLAI
Title
Bluetooth: ISO: zero the sockaddr before returning it in getname
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: zero the sockaddr before returning it in getname iso_sock_getname() fills a struct sockaddr_iso in place and returns its size without clearing it first, so bytes it does not write are copied to user space from the kernel stack. The getsockname(2) and getpeername(2) paths both run through do_getsockname(), which hands getname() an uninitialized sockaddr_storage on the stack and copies back up to the number of bytes getname() returns, so the driver has to initialize every byte it accounts for. Two ranges are left uninitialized: - struct sockaddr_iso is 10 bytes but only 9 are written (family, iso_bdaddr, iso_bdaddr_type), leaking the trailing pad byte on every call. - for a broadcast peer (BIS_LINK or PA_LINK) the returned length grows by sizeof(struct sockaddr_iso_bc), but only bc_sid, bc_num_bis and bc_bis are filled; bc_bdaddr and bc_bdaddr_type, the first 7 bytes of that structure, are never written. An unprivileged process can open a BTPROTO_ISO socket and reach the pad leak with getsockname(); the broadcast leak needs an established BIS/PA connection. l2cap and rfcomm already memset their sockaddr in getname for the same reason; do the same here.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 1f6d1f2611af0eb36b133a41d29ffd2cc2601615 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 9069be87c67f290783b332c4284e09fb89cb9ea7 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 190b719b787eb4ca6c25b12fab224806f9108b06 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 884cf2cc957da7ac178a0e6c6c69ddfec0481cc8 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1f6d1f2611af0eb36b133a41d29ffd2cc2601615",
              "status": "affected",
              "version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
              "versionType": "git"
            },
            {
              "lessThan": "9069be87c67f290783b332c4284e09fb89cb9ea7",
              "status": "affected",
              "version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
              "versionType": "git"
            },
            {
              "lessThan": "190b719b787eb4ca6c25b12fab224806f9108b06",
              "status": "affected",
              "version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
              "versionType": "git"
            },
            {
              "lessThan": "884cf2cc957da7ac178a0e6c6c69ddfec0481cc8",
              "status": "affected",
              "version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.47",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.11",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.1",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: zero the sockaddr before returning it in getname\n\niso_sock_getname() fills a struct sockaddr_iso in place and returns its\nsize without clearing it first, so bytes it does not write are copied to\nuser space from the kernel stack. The getsockname(2) and getpeername(2)\npaths both run through do_getsockname(), which hands getname() an\nuninitialized sockaddr_storage on the stack and copies back up to the\nnumber of bytes getname() returns, so the driver has to initialize every\nbyte it accounts for.\n\nTwo ranges are left uninitialized:\n\n  - struct sockaddr_iso is 10 bytes but only 9 are written (family,\n    iso_bdaddr, iso_bdaddr_type), leaking the trailing pad byte on every\n    call.\n\n  - for a broadcast peer (BIS_LINK or PA_LINK) the returned length grows\n    by sizeof(struct sockaddr_iso_bc), but only bc_sid, bc_num_bis and\n    bc_bis are filled; bc_bdaddr and bc_bdaddr_type, the first 7 bytes of\n    that structure, are never written.\n\nAn unprivileged process can open a BTPROTO_ISO socket and reach the pad\nleak with getsockname(); the broadcast leak needs an established BIS/PA\nconnection. l2cap and rfcomm already memset their sockaddr in getname\nfor the same reason; do the same here."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:12:33.345Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1f6d1f2611af0eb36b133a41d29ffd2cc2601615"
        },
        {
          "url": "https://git.kernel.org/stable/c/9069be87c67f290783b332c4284e09fb89cb9ea7"
        },
        {
          "url": "https://git.kernel.org/stable/c/190b719b787eb4ca6c25b12fab224806f9108b06"
        },
        {
          "url": "https://git.kernel.org/stable/c/884cf2cc957da7ac178a0e6c6c69ddfec0481cc8"
        }
      ],
      "title": "Bluetooth: ISO: zero the sockaddr before returning it in getname",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80761",
    "datePublished": "2026-09-04T15:12:33.345Z",
    "dateReserved": "2026-08-26T14:34:25.791Z",
    "dateUpdated": "2026-09-04T15:12:33.345Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80761",
      "date": "2026-09-15",
      "epss": "0.00168",
      "percentile": "0.06411"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-07T01:52:54.000Z",
      "cve": "CVE-2026-80761",
      "id": "msrc_CVE-2026-80761",
      "initial_release_date": "2026-09-07T01:52:54.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: ISO: zero the sockaddr before returning it in getname",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80761.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80761\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:01.190\",\"lastModified\":\"2026-09-04T16:18:01.190\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: ISO: zero the sockaddr before returning it in getname\\n\\niso_sock_getname() fills a struct sockaddr_iso in place and returns its\\nsize without clearing it first, so bytes it does not write are copied to\\nuser space from the kernel stack. The getsockname(2) and getpeername(2)\\npaths both run through do_getsockname(), which hands getname() an\\nuninitialized sockaddr_storage on the stack and copies back up to the\\nnumber of bytes getname() returns, so the driver has to initialize every\\nbyte it accounts for.\\n\\nTwo ranges are left uninitialized:\\n\\n  - struct sockaddr_iso is 10 bytes but only 9 are written (family,\\n    iso_bdaddr, iso_bdaddr_type), leaking the trailing pad byte on every\\n    call.\\n\\n  - for a broadcast peer (BIS_LINK or PA_LINK) the returned length grows\\n    by sizeof(struct sockaddr_iso_bc), but only bc_sid, bc_num_bis and\\n    bc_bis are filled; bc_bdaddr and bc_bdaddr_type, the first 7 bytes of\\n    that structure, are never written.\\n\\nAn unprivileged process can open a BTPROTO_ISO socket and reach the pad\\nleak with getsockname(); the broadcast leak needs an established BIS/PA\\nconnection. l2cap and rfcomm already memset their sockaddr in getname\\nfor the same reason; do the same here.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/iso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"1f6d1f2611af0eb36b133a41d29ffd2cc2601615\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"9069be87c67f290783b332c4284e09fb89cb9ea7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"190b719b787eb4ca6c25b12fab224806f9108b06\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"884cf2cc957da7ac178a0e6c6c69ddfec0481cc8\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/iso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/190b719b787eb4ca6c25b12fab224806f9108b06\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1f6d1f2611af0eb36b133a41d29ffd2cc2601615\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/884cf2cc957da7ac178a0e6c6c69ddfec0481cc8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9069be87c67f290783b332c4284e09fb89cb9ea7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-07T16:20:11Z",
      "cve": "CVE-2026-80761",
      "id": "CVE-2026-80761",
      "initial_release_date": "2026-09-05T00:28:01Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80761",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80761.json",
      "version": "4"
    }
  }
}



Log in or create an account to share your comment.




Tags
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.