{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89569", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.726Z", "datePublished": "2026-09-11T19:44:38.838Z", "dateUpdated": "2026-09-11T19:44:38.838Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:44:38.838Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: serialize security confirmation handling\n\nrfcomm_security_cfm() looks up a session on session_list and then walks\nits DLC list without holding rfcomm_mutex. Since RFCOMM session teardown\nuses rfcomm_mutex, krfcommd can close and free the same session and DLCs\nconcurrently:\n\n hci_rx_work krfcommd\n ----------- ---------\n rfcomm_session_get()\n rfcomm_lock()\n rfcomm_session_close()\n rfcomm_dlc_unlink()\n rfcomm_session_del()\n kfree(s)\n rfcomm_unlock()\n walk s->dlcs\n\nThe callback can then read a freed session list head and touch freed DLCs\nwhile updating their flags or timers.\n\nSerialize the session lookup and DLC traversal in rfcomm_security_cfm()\nwith rfcomm_mutex. This matches the existing RFCOMM session lifetime\nrules and prevents concurrent rfcomm_session_del() / rfcomm_dlc_unlink()\nfrom tearing the objects down while the callback is using them.\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in rfcomm_security_cfm+0x41c/0x440\n Read of size 8 at addr ffff888111fb3960 by task kworker/u17:1/89\n Workqueue: hci0 hci_rx_work\n Call Trace:\n rfcomm_security_cfm+0x41c/0x440\n hci_encrypt_cfm+0x139/0x590\n hci_encrypt_change_evt+0x37b/0xc40\n hci_event_packet+0x71b/0xb20\n hci_rx_work+0x293/0x730\n Allocated by task 69:\n rfcomm_session_add+0x9e/0x2f0\n rfcomm_run+0x44b/0x41e0\n Freed by task 69:\n kfree+0x131/0x3c0\n rfcomm_session_del+0x188/0x220\n rfcomm_run+0x1985/0x41e0"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/rfcomm/core.c"], "versions": [{"version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "1b7841ffad08e911e8c4b9470f3fa08423568940", "status": "affected", "versionType": "git"}, {"version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "946d76db77ee5f922968ce558629ae47b381e3fc", "status": "affected", "versionType": "git"}, {"version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "fbf7961964a6e93360179f64712320ae9a1e9577", "status": "affected", "versionType": "git"}, {"version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "759c185d0bbdb131357408f50b8735e04ed3caff", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/rfcomm/core.c"], "versions": [{"version": "3.10", "status": "affected"}, {"version": "0", "lessThan": "3.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "3.10", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1b7841ffad08e911e8c4b9470f3fa08423568940"}, {"url": "https://git.kernel.org/stable/c/946d76db77ee5f922968ce558629ae47b381e3fc"}, {"url": "https://git.kernel.org/stable/c/fbf7961964a6e93360179f64712320ae9a1e9577"}, {"url": "https://git.kernel.org/stable/c/759c185d0bbdb131357408f50b8735e04ed3caff"}], "title": "Bluetooth: RFCOMM: serialize security confirmation handling", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bluetooth/rfcomm/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1b7841ffad08e911e8c4b9470f3fa08423568940", "status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "versionType": "git"}, {"lessThan": "946d76db77ee5f922968ce558629ae47b381e3fc", "status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "versionType": "git"}, {"lessThan": "fbf7961964a6e93360179f64712320ae9a1e9577", "status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "versionType": "git"}, {"lessThan": "759c185d0bbdb131357408f50b8735e04ed3caff", "status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bluetooth/rfcomm/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.10"}, {"lessThan": "3.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "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: RFCOMM: serialize security confirmation handling\n\nrfcomm_security_cfm() looks up a session on session_list and then walks\nits DLC list without holding rfcomm_mutex. Since RFCOMM session teardown\nuses rfcomm_mutex, krfcommd can close and free the same session and DLCs\nconcurrently:\n\n hci_rx_work krfcommd\n ----------- ---------\n rfcomm_session_get()\n rfcomm_lock()\n rfcomm_session_close()\n rfcomm_dlc_unlink()\n rfcomm_session_del()\n kfree(s)\n rfcomm_unlock()\n walk s->dlcs\n\nThe callback can then read a freed session list head and touch freed DLCs\nwhile updating their flags or timers.\n\nSerialize the session lookup and DLC traversal in rfcomm_security_cfm()\nwith rfcomm_mutex. This matches the existing RFCOMM session lifetime\nrules and prevents concurrent rfcomm_session_del() / rfcomm_dlc_unlink()\nfrom tearing the objects down while the callback is using them.\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in rfcomm_security_cfm+0x41c/0x440\n Read of size 8 at addr ffff888111fb3960 by task kworker/u17:1/89\n Workqueue: hci0 hci_rx_work\n Call Trace:\n rfcomm_security_cfm+0x41c/0x440\n hci_encrypt_cfm+0x139/0x590\n hci_encrypt_change_evt+0x37b/0xc40\n hci_event_packet+0x71b/0xb20\n hci_rx_work+0x293/0x730\n Allocated by task 69:\n rfcomm_session_add+0x9e/0x2f0\n rfcomm_run+0x44b/0x41e0\n Freed by task 69:\n kfree+0x131/0x3c0\n rfcomm_session_del+0x188/0x220\n rfcomm_run+0x1985/0x41e0"}], "id": "CVE-2026-89569", "lastModified": "2026-09-11T20:19:40.920", "metrics": {}, "published": "2026-09-11T20:19:40.920", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1b7841ffad08e911e8c4b9470f3fa08423568940"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/759c185d0bbdb131357408f50b8735e04ed3caff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/946d76db77ee5f922968ce558629ae47b381e3fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fbf7961964a6e93360179f64712320ae9a1e9577"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel Bluetooth RFCOMM: Denial of Service from memory management flaw", "id": "2532060", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532060"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's Bluetooth RFCOMM subsystem. This vulnerability arises because the system does not properly manage memory when handling Bluetooth security confirmations. A race condition allows a part of the system to free memory that is still in use by another part, leading to a \"use-after-free\" error. This can result in a system crash, causing a Denial of Service (DoS)."], "name": "CVE-2026-89569", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-11T19:44:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89569\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89569\nhttps://git.kernel.org/stable/c/1b7841ffad08e911e8c4b9470f3fa08423568940\nhttps://git.kernel.org/stable/c/759c185d0bbdb131357408f50b8735e04ed3caff\nhttps://git.kernel.org/stable/c/946d76db77ee5f922968ce558629ae47b381e3fc\nhttps://git.kernel.org/stable/c/fbf7961964a6e93360179f64712320ae9a1e9577"], "threat_severity": "Important"}

{}