CVE-2026-98735

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98735", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.367Z", "datePublished": "2026-10-18T15:47:13.062Z", "dateUpdated": "2026-10-30T12:39:11.976Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:39:11.976Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_core: Serialize ACL scheduling with channel deletion\n\nhci_chan_sent() selects a channel under RCU but drops the read lock before\naccessing chan->conn and returning the channel. The ACL and LE schedulers\nthen use its packet queue and update its transmit counters without any\nprotection against channel deletion.\n\nAfter TX selects a channel and releases RCU, a disconnect command timeout\non the separate request workqueue can run hci_conn_failed() and\nl2cap_conn_del(). hci_chan_del() can then unlink the channel, complete\nsynchronize_rcu(), purge its queue and free it before TX resumes. This\ncauses use-after-free both in hci_chan_sent() and in its callers.\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in hci_chan_sent+0x892/0x9b0\n Workqueue: hci0 hci_tx_work\n Call Trace:\n hci_chan_sent+0x892/0x9b0\n hci_tx_work+0x5e6/0xb70\n Allocated by task 91:\n hci_chan_create+0xe3/0x350\n l2cap_conn_add.part.0+0x12/0xa30\n l2cap_chan_connect+0x110d/0x1b60\n l2cap_sock_connect+0x310/0x530\n Freed by task 99:\n hci_chan_del+0x11f/0x170\n l2cap_conn_del+0x4f1/0x800\n l2cap_connect_cfm+0x88c/0xd30\n hci_conn_failed+0x150/0x250\n hci_abort_conn_sync+0x3e3/0x800\n hci_cmd_sync_run+0x7e/0xc0\n hci_abort_conn+0x105/0x1f0\n disconnect_sync+0x157/0x290\n hci_cmd_sync_work+0x13c/0x290\n\nHold the existing device mutex across channel selection and transmission\nin both schedulers to serialize them with channel teardown. Keep timeout\nhandling outside the critical sections because hci_link_tx_to() acquires\nthe same mutex. This also permits the transmit path to sleep, unlike\nextending the RCU read-side critical section across packet submission."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/hci_core.c"], "versions": [{"version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "lessThan": "126714c495bf31a5e71411b8e0b65a685bb5e58d", "status": "affected", "versionType": "git"}, {"version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "lessThan": "7fbeda3dcd5f54e7429f4b5e2cfa7344b7e9b1c9", "status": "affected", "versionType": "git"}, {"version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "lessThan": "74667f6eb7c12b65c56e02e0f527e4099db4ebfd", "status": "affected", "versionType": "git"}, {"version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "lessThan": "780affacd92977fd9b819bdc4f26a6832cb27fda", "status": "affected", "versionType": "git"}, {"version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "lessThan": "51f95ea451f25d7e3f048c0f438f04fa74688aae", "status": "affected", "versionType": "git"}, {"version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "lessThan": "86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd", "status": "affected", "versionType": "git"}, {"version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "lessThan": "4fda8f0abeea9929036446d89a476fb8298abcb0", "status": "affected", "versionType": "git"}, {"version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "lessThan": "f4845ab191a4f686a5da481fbba90ed73bb693b0", "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/hci_core.c"], "versions": [{"version": "3.3", "status": "affected"}, {"version": "0", "lessThan": "3.3", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.10", "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": "3.3", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.18.56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "7.2.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/126714c495bf31a5e71411b8e0b65a685bb5e58d"}, {"url": "https://git.kernel.org/stable/c/7fbeda3dcd5f54e7429f4b5e2cfa7344b7e9b1c9"}, {"url": "https://git.kernel.org/stable/c/74667f6eb7c12b65c56e02e0f527e4099db4ebfd"}, {"url": "https://git.kernel.org/stable/c/780affacd92977fd9b819bdc4f26a6832cb27fda"}, {"url": "https://git.kernel.org/stable/c/51f95ea451f25d7e3f048c0f438f04fa74688aae"}, {"url": "https://git.kernel.org/stable/c/86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd"}, {"url": "https://git.kernel.org/stable/c/4fda8f0abeea9929036446d89a476fb8298abcb0"}, {"url": "https://git.kernel.org/stable/c/f4845ab191a4f686a5da481fbba90ed73bb693b0"}], "title": "Bluetooth: hci_core: Serialize ACL scheduling with channel deletion", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bluetooth/hci_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "126714c495bf31a5e71411b8e0b65a685bb5e58d", "status": "affected", "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "versionType": "git"}, {"lessThan": "7fbeda3dcd5f54e7429f4b5e2cfa7344b7e9b1c9", "status": "affected", "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "versionType": "git"}, {"lessThan": "74667f6eb7c12b65c56e02e0f527e4099db4ebfd", "status": "affected", "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "versionType": "git"}, {"lessThan": "780affacd92977fd9b819bdc4f26a6832cb27fda", "status": "affected", "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "versionType": "git"}, {"lessThan": "51f95ea451f25d7e3f048c0f438f04fa74688aae", "status": "affected", "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "versionType": "git"}, {"lessThan": "86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd", "status": "affected", "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "versionType": "git"}, {"lessThan": "4fda8f0abeea9929036446d89a476fb8298abcb0", "status": "affected", "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "versionType": "git"}, {"lessThan": "f4845ab191a4f686a5da481fbba90ed73bb693b0", "status": "affected", "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bluetooth/hci_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.3"}, {"lessThan": "3.3", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.10", "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: hci_core: Serialize ACL scheduling with channel deletion\n\nhci_chan_sent() selects a channel under RCU but drops the read lock before\naccessing chan->conn and returning the channel. The ACL and LE schedulers\nthen use its packet queue and update its transmit counters without any\nprotection against channel deletion.\n\nAfter TX selects a channel and releases RCU, a disconnect command timeout\non the separate request workqueue can run hci_conn_failed() and\nl2cap_conn_del(). hci_chan_del() can then unlink the channel, complete\nsynchronize_rcu(), purge its queue and free it before TX resumes. This\ncauses use-after-free both in hci_chan_sent() and in its callers.\n\nKASAN reported:\n\n BUG: KASAN: slab-use-after-free in hci_chan_sent+0x892/0x9b0\n Workqueue: hci0 hci_tx_work\n Call Trace:\n hci_chan_sent+0x892/0x9b0\n hci_tx_work+0x5e6/0xb70\n Allocated by task 91:\n hci_chan_create+0xe3/0x350\n l2cap_conn_add.part.0+0x12/0xa30\n l2cap_chan_connect+0x110d/0x1b60\n l2cap_sock_connect+0x310/0x530\n Freed by task 99:\n hci_chan_del+0x11f/0x170\n l2cap_conn_del+0x4f1/0x800\n l2cap_connect_cfm+0x88c/0xd30\n hci_conn_failed+0x150/0x250\n hci_abort_conn_sync+0x3e3/0x800\n hci_cmd_sync_run+0x7e/0xc0\n hci_abort_conn+0x105/0x1f0\n disconnect_sync+0x157/0x290\n hci_cmd_sync_work+0x13c/0x290\n\nHold the existing device mutex across channel selection and transmission\nin both schedulers to serialize them with channel teardown. Keep timeout\nhandling outside the critical sections because hci_link_tx_to() acquires\nthe same mutex. This also permits the transmit path to sleep, unlike\nextending the RCU read-side critical section across packet submission."}], "id": "CVE-2026-98735", "lastModified": "2026-10-30T13:21:22.250", "metrics": {}, "published": "2026-10-18T16:17:27.127", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/126714c495bf31a5e71411b8e0b65a685bb5e58d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4fda8f0abeea9929036446d89a476fb8298abcb0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/51f95ea451f25d7e3f048c0f438f04fa74688aae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/74667f6eb7c12b65c56e02e0f527e4099db4ebfd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/780affacd92977fd9b819bdc4f26a6832cb27fda"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7fbeda3dcd5f54e7429f4b5e2cfa7344b7e9b1c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f4845ab191a4f686a5da481fbba90ed73bb693b0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Bluetooth: hci_core: Serialize ACL scheduling with channel deletion", "id": "2555083", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555083"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: hci_core: Serialize ACL scheduling with channel deletion\nhci_chan_sent() selects a channel under RCU but drops the read lock before\naccessing chan->conn and returning the channel. The ACL and LE schedulers\nthen use its packet queue and update its transmit counters without any\nprotection against channel deletion.\nAfter TX selects a channel and releases RCU, a disconnect command timeout\non the separate request workqueue can run hci_conn_failed() and\nl2cap_conn_del(). hci_chan_del() can then unlink the channel, complete\nsynchronize_rcu(), purge its queue and free it before TX resumes. This\ncauses use-after-free both in hci_chan_sent() and in its callers.\nKASAN reported:\nBUG: KASAN: slab-use-after-free in hci_chan_sent+0x892/0x9b0\nWorkqueue: hci0 hci_tx_work\nCall Trace:\nhci_chan_sent+0x892/0x9b0\nhci_tx_work+0x5e6/0xb70\nAllocated by task 91:\nhci_chan_create+0xe3/0x350\nl2cap_conn_add.part.0+0x12/0xa30\nl2cap_chan_connect+0x110d/0x1b60\nl2cap_sock_connect+0x310/0x530\nFreed by task 99:\nhci_chan_del+0x11f/0x170\nl2cap_conn_del+0x4f1/0x800\nl2cap_connect_cfm+0x88c/0xd30\nhci_conn_failed+0x150/0x250\nhci_abort_conn_sync+0x3e3/0x800\nhci_cmd_sync_run+0x7e/0xc0\nhci_abort_conn+0x105/0x1f0\ndisconnect_sync+0x157/0x290\nhci_cmd_sync_work+0x13c/0x290\nHold the existing device mutex across channel selection and transmission\nin both schedulers to serialize them with channel teardown. Keep timeout\nhandling outside the critical sections because hci_link_tx_to() acquires\nthe same mutex. This also permits the transmit path to sleep, unlike\nextending the RCU read-side critical section across packet submission.", "A flaw was found in the Linux kernel's Bluetooth subsystem. A race condition occurs when outgoing network packets are scheduled while the associated communication channel is concurrently closed and freed during connection teardown. A local attacker could exploit this flaw to trigger a use-after-free memory error, leading to a system crash (denial of service) or potentially arbitrary code execution."], "name": "CVE-2026-98735", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "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"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98735\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98735\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98735.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3eff45eaf81780dad25c167bbaafa7d25ae407da,51f95ea451f25d7e3f048c0f438f04fa74688aae)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3eff45eaf81780dad25c167bbaafa7d25ae407da,86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3eff45eaf81780dad25c167bbaafa7d25ae407da,4fda8f0abeea9929036446d89a476fb8298abcb0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3eff45eaf81780dad25c167bbaafa7d25ae407da,f4845ab191a4f686a5da481fbba90ed73bb693b0)"}}], "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": "3.3"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.3)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.113,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.56,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.10,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "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": "2026-10-18T22:15:14.436369+00:00", "updated": "2026-10-23T22:45:14.485440+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}