{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64404", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.785Z", "datePublished": "2026-07-25T08:50:46.523Z", "dateUpdated": "2026-07-25T08:50:46.523Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-25T08:50:46.523Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()\n\niso_conn_big_sync() drops the socket lock to call hci_get_route() and\nthen re-acquires it, but dereferences iso_pi(sk)->conn->hcon afterwards\nwithout re-checking that conn is still valid.\n\nWhile the lock is dropped, the connection can be torn down under the\nsame socket lock: iso_disconn_cfm() -> iso_conn_del() -> iso_chan_del()\nsets iso_pi(sk)->conn to NULL (and the broadcast teardown path can also\nclear conn->hcon on its own). When iso_conn_big_sync() re-acquires the\nlock and reads conn->hcon, conn may be NULL, causing a NULL pointer\ndereference (hcon is the first member of struct iso_conn).\n\nThis path is reached from iso_sock_recvmsg() for a PA-sync broadcast\nsink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock\nwindow can race with connection teardown driven by controller events.\n\nRe-validate iso_pi(sk)->conn and its hcon after re-acquiring the socket\nlock and bail out if the connection went away, as already done in the\nsibling iso_sock_rebind_bc()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/iso.c"], "versions": [{"version": "cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5", "lessThan": "b3e647a4aa4d2d054f86a783f5c426035e1dc237", "status": "affected", "versionType": "git"}, {"version": "7a17308c17880d259105f6e591eb1bc77b9612f0", "lessThan": "b84eeb7636d6962dd882d5e0b31475e4f404313c", "status": "affected", "versionType": "git"}, {"version": "7a17308c17880d259105f6e591eb1bc77b9612f0", "lessThan": "01afd198c2c286cd3b81f44d4e33a2e638711550", "status": "affected", "versionType": "git"}, {"version": "7a17308c17880d259105f6e591eb1bc77b9612f0", "lessThan": "d5541eb148da72d5e0a1bca8ecd171f9fc8b366f", "status": "affected", "versionType": "git"}, {"version": "6.12.6", "lessThan": "6.12.96", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/iso.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.6", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.2-rc3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b3e647a4aa4d2d054f86a783f5c426035e1dc237"}, {"url": "https://git.kernel.org/stable/c/b84eeb7636d6962dd882d5e0b31475e4f404313c"}, {"url": "https://git.kernel.org/stable/c/01afd198c2c286cd3b81f44d4e33a2e638711550"}, {"url": "https://git.kernel.org/stable/c/d5541eb148da72d5e0a1bca8ecd171f9fc8b366f"}], "title": "Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"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": "b3e647a4aa4d2d054f86a783f5c426035e1dc237", "status": "affected", "version": "cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5", "versionType": "git"}, {"lessThan": "b84eeb7636d6962dd882d5e0b31475e4f404313c", "status": "affected", "version": "7a17308c17880d259105f6e591eb1bc77b9612f0", "versionType": "git"}, {"lessThan": "01afd198c2c286cd3b81f44d4e33a2e638711550", "status": "affected", "version": "7a17308c17880d259105f6e591eb1bc77b9612f0", "versionType": "git"}, {"lessThan": "d5541eb148da72d5e0a1bca8ecd171f9fc8b366f", "status": "affected", "version": "7a17308c17880d259105f6e591eb1bc77b9612f0", "versionType": "git"}, {"lessThan": "6.12.96", "status": "affected", "version": "6.12.6", "versionType": "semver"}]}, {"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": "6.13"}, {"lessThan": "6.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.96", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.39", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()\n\niso_conn_big_sync() drops the socket lock to call hci_get_route() and\nthen re-acquires it, but dereferences iso_pi(sk)->conn->hcon afterwards\nwithout re-checking that conn is still valid.\n\nWhile the lock is dropped, the connection can be torn down under the\nsame socket lock: iso_disconn_cfm() -> iso_conn_del() -> iso_chan_del()\nsets iso_pi(sk)->conn to NULL (and the broadcast teardown path can also\nclear conn->hcon on its own). When iso_conn_big_sync() re-acquires the\nlock and reads conn->hcon, conn may be NULL, causing a NULL pointer\ndereference (hcon is the first member of struct iso_conn).\n\nThis path is reached from iso_sock_recvmsg() for a PA-sync broadcast\nsink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock\nwindow can race with connection teardown driven by controller events.\n\nRe-validate iso_pi(sk)->conn and its hcon after re-acquiring the socket\nlock and bail out if the connection went away, as already done in the\nsibling iso_sock_rebind_bc()."}], "id": "CVE-2026-64404", "lastModified": "2026-08-11T15:01:50.637", "metrics": {}, "published": "2026-07-25T10:17:24.003", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/01afd198c2c286cd3b81f44d4e33a2e638711550"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b3e647a4aa4d2d054f86a783f5c426035e1dc237"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b84eeb7636d6962dd882d5e0b31475e4f404313c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d5541eb148da72d5e0a1bca8ecd171f9fc8b366f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()", "id": "2507170", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507170"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's Bluetooth subsystem. A race condition exists in the iso_conn_big_sync() function where a socket lock is temporarily released and re-acquired. During this window, the Bluetooth connection can be unexpectedly terminated. If the connection is torn down, the subsequent attempt to access connection details can lead to a null pointer dereference, causing the system to crash. This vulnerability can result in a Denial of Service (DoS) for an affected system."], "name": "CVE-2026-64404", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64404\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64404\nhttps://lore.kernel.org/linux-cve-announce/2026072530-CVE-2026-64404-777e@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5,b3e647a4aa4d2d054f86a783f5c426035e1dc237)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7a17308c17880d259105f6e591eb1bc77b9612f0,b84eeb7636d6962dd882d5e0b31475e4f404313c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7a17308c17880d259105f6e591eb1bc77b9612f0,01afd198c2c286cd3b81f44d4e33a2e638711550)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7a17308c17880d259105f6e591eb1bc77b9612f0,d5541eb148da72d5e0a1bca8ecd171f9fc8b366f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.6,6.12.96)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.96,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-25T17:30:08.003540+00:00", "updated": "2026-08-02T13:00:05.295160+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}