CVE-2026-89569

{"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": "2026-10-19T08:49:02.628Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:49:02.628Z"}, "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"}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:A - rfcomm_security_cfm() runs from hci_encrypt_cfm()/hci_auth_cfm() on hci_rx_work when the controller reports encryption or authentication complete. An in-range Bluetooth peer that opens an RFCOMM/L2CAP session can drive those HCI events; kernel CNA guidance scores Bluetooth as Adjacent.\nAC:L - The UAF is a race between hci_rx_work walking the session and krfcommd freeing it. A peer controls both sides by triggering encrypt/auth complete while disconnecting RFCOMM/L2CAP or the ACL link so krfcommd runs rfcomm_session_close(), and can retry until the window is hit.\nPR:N - A nearby Bluetooth device needs no Linux account or capability. krfcommd listens on L2CAP PSM RFCOMM at default BT_SECURITY_LOW, and HCI encrypt/auth complete (including failures) call rfcomm_security_cfm() with no local credential check.\nUI:N - Phones, cars, and IoT devices with Bluetooth enabled accept RFCOMM/L2CAP and emit encrypt-change events during ordinary link setup or teardown. No extra victim action such as pairing confirmation, mounting, or opening a file is required at exploit time.\nS:U - The UAF corrupts kernel RFCOMM session and DLC objects in the host Bluetooth stack. It does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - After rfcomm_session_del() frees the session, the callback reads the slab-freed list head and DLC flags, state, and sec_level. Kernel UAF of these objects enables heap reuse and arbitrary kernel read primitives.\nI:H - The callback writes DLC flag bits and arms or cancels DLC timers on objects krfcommd may already have unlinked and freed, so a reused slab object can be corrupted or have its timer hijacked for control-flow takeover.\nA:H - KASAN reported slab-use-after-free in rfcomm_security_cfm() on hci_rx_work; triggering the race oopses or panics the kernel even without a full exploit."}]}], "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": "62ce8b33eb238cf18c15207332fbdc26d858f592", "status": "affected", "versionType": "git"}, {"version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "3873f3449701b3dc98cba577923be6493598e7a1", "status": "affected", "versionType": "git"}, {"version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "7ded3264106418c6456ccceaafd9fda596ce12c3", "status": "affected", "versionType": "git"}, {"version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "82425b14f0fb22e46cfddc56d6465570f5ed0ce6", "status": "affected", "versionType": "git"}, {"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": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "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", "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": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10", "versionEndExcluding": "6.6.157"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/62ce8b33eb238cf18c15207332fbdc26d858f592"}, {"url": "https://git.kernel.org/stable/c/3873f3449701b3dc98cba577923be6493598e7a1"}, {"url": "https://git.kernel.org/stable/c/7ded3264106418c6456ccceaafd9fda596ce12c3"}, {"url": "https://git.kernel.org/stable/c/82425b14f0fb22e46cfddc56d6465570f5ed0ce6"}, {"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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89569", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:24:18.874687Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:44.485Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89569", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:24:18.874687Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:24:19.735Z"}}], "cna": {"title": "Bluetooth: RFCOMM: serialize security confirmation handling", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 8.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:A - rfcomm_security_cfm() runs from hci_encrypt_cfm()/hci_auth_cfm() on hci_rx_work when the controller reports encryption or authentication complete. An in-range Bluetooth peer that opens an RFCOMM/L2CAP session can drive those HCI events; kernel CNA guidance scores Bluetooth as Adjacent.\nAC:L - The UAF is a race between hci_rx_work walking the session and krfcommd freeing it. A peer controls both sides by triggering encrypt/auth complete while disconnecting RFCOMM/L2CAP or the ACL link so krfcommd runs rfcomm_session_close(), and can retry until the window is hit.\nPR:N - A nearby Bluetooth device needs no Linux account or capability. krfcommd listens on L2CAP PSM RFCOMM at default BT_SECURITY_LOW, and HCI encrypt/auth complete (including failures) call rfcomm_security_cfm() with no local credential check.\nUI:N - Phones, cars, and IoT devices with Bluetooth enabled accept RFCOMM/L2CAP and emit encrypt-change events during ordinary link setup or teardown. No extra victim action such as pairing confirmation, mounting, or opening a file is required at exploit time.\nS:U - The UAF corrupts kernel RFCOMM session and DLC objects in the host Bluetooth stack. It does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - After rfcomm_session_del() frees the session, the callback reads the slab-freed list head and DLC flags, state, and sec_level. Kernel UAF of these objects enables heap reuse and arbitrary kernel read primitives.\nI:H - The callback writes DLC flag bits and arms or cancels DLC timers on objects krfcommd may already have unlinked and freed, so a reused slab object can be corrupted or have its timer hijacked for control-flow takeover.\nA:H - KASAN reported slab-use-after-free in rfcomm_security_cfm() on hci_rx_work; triggering the race oopses or panics the kernel even without a full exploit."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "62ce8b33eb238cf18c15207332fbdc26d858f592", "versionType": "git"}, {"status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "3873f3449701b3dc98cba577923be6493598e7a1", "versionType": "git"}, {"status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "7ded3264106418c6456ccceaafd9fda596ce12c3", "versionType": "git"}, {"status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "82425b14f0fb22e46cfddc56d6465570f5ed0ce6", "versionType": "git"}, {"status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "1b7841ffad08e911e8c4b9470f3fa08423568940", "versionType": "git"}, {"status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "946d76db77ee5f922968ce558629ae47b381e3fc", "versionType": "git"}, {"status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "fbf7961964a6e93360179f64712320ae9a1e9577", "versionType": "git"}, {"status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "lessThan": "759c185d0bbdb131357408f50b8735e04ed3caff", "versionType": "git"}], "programFiles": ["net/bluetooth/rfcomm/core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.10"}, {"status": "unaffected", "version": "0", "lessThan": "3.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.270", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.109", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bluetooth/rfcomm/core.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/62ce8b33eb238cf18c15207332fbdc26d858f592"}, {"url": "https://git.kernel.org/stable/c/3873f3449701b3dc98cba577923be6493598e7a1"}, {"url": "https://git.kernel.org/stable/c/7ded3264106418c6456ccceaafd9fda596ce12c3"}, {"url": "https://git.kernel.org/stable/c/82425b14f0fb22e46cfddc56d6465570f5ed0ce6"}, {"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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.270", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.221", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.188", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.157", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.109", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.50", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2.4", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.3", "versionStartIncluding": "3.10"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:49:02.628Z"}}}, "cveMetadata": {"cveId": "CVE-2026-89569", "state": "PUBLISHED", "dateUpdated": "2026-10-19T08:49:02.628Z", "dateReserved": "2026-09-11T19:38:34.726Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-09-11T19:44:38.838Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"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": "62ce8b33eb238cf18c15207332fbdc26d858f592", "status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "versionType": "git"}, {"lessThan": "3873f3449701b3dc98cba577923be6493598e7a1", "status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "versionType": "git"}, {"lessThan": "7ded3264106418c6456ccceaafd9fda596ce12c3", "status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "versionType": "git"}, {"lessThan": "82425b14f0fb22e46cfddc56d6465570f5ed0ce6", "status": "affected", "version": "08c30aca9e698faddebd34f81e1196295f9dc063", "versionType": "git"}, {"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": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "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", "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": "2026-10-19T09:17:52.730", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-89569", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:24:18.874687Z", "version": "2.0.3"}}]}, "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/3873f3449701b3dc98cba577923be6493598e7a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/62ce8b33eb238cf18c15207332fbdc26d858f592"}, {"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/7ded3264106418c6456ccceaafd9fda596ce12c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/82425b14f0fb22e46cfddc56d6465570f5ed0ce6"}, {"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"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08c30aca9e698faddebd34f81e1196295f9dc063,1b7841ffad08e911e8c4b9470f3fa08423568940)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08c30aca9e698faddebd34f81e1196295f9dc063,946d76db77ee5f922968ce558629ae47b381e3fc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08c30aca9e698faddebd34f81e1196295f9dc063,fbf7961964a6e93360179f64712320ae9a1e9577)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08c30aca9e698faddebd34f81e1196295f9dc063,759c185d0bbdb131357408f50b8735e04ed3caff)"}}], "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": "3.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "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": "2026-09-12T04:15:05.730132+00:00", "updated": "2026-09-15T22:00:17.599456+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}