CVE-2026-98737

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98737", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.367Z", "datePublished": "2026-10-18T15:47:14.936Z", "dateUpdated": "2026-10-21T12:56:13.421Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:56:13.421Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Fix inquiry cache use-after-free\n\nThe sync command worker holds hdev->req_lock, but inquiry-cache updates\nand flushes use hdev->lock. Both hci_acl_create_conn_sync() and\nhci_stop_discovery_sync() look up entries and read their fields without\ntaking hdev->lock.\n\nAfter either lookup returns, a concurrent HCIINQUIRY ioctl can acquire\nhdev->lock and flush the cache, freeing the entry. The worker then reads\nthe freed entry while preparing a create-connection or remote-name-cancel\ncommand. The list traversal also races with cache updates and removal.\n\nKASAN reported these accesses:\n\n BUG: KASAN: slab-use-after-free in hci_acl_create_conn_sync+0x5f1/0x650\n Workqueue: hci0 hci_cmd_sync_work\n Call Trace:\n hci_acl_create_conn_sync+0x5f1/0x650\n hci_cmd_sync_work+0x13c/0x290\n\n Allocated by task 90:\n hci_inquiry_cache_update+0x3e6/0x7d0\n hci_inquiry_result_evt+0x3cb/0x560\n\n Freed by task 93:\n hci_inquiry_cache_flush+0x111/0x2b0\n hci_inquiry+0x2f2/0x780\n hci_sock_ioctl+0x269/0x5f0\n\n BUG: KASAN: slab-use-after-free in hci_stop_discovery_sync+0x3b1/0x3c0\n Workqueue: hci0 hci_cmd_sync_work\n Call Trace:\n hci_stop_discovery_sync+0x3b1/0x3c0\n hci_cmd_sync_work+0x173/0x300\n\n Allocated by task 86:\n hci_inquiry_cache_update+0x483/0x940\n hci_inquiry_result_evt+0x3cb/0x560\n\n Freed by task 91:\n hci_inquiry_cache_flush+0x13e/0x2f0\n hci_inquiry+0x2f2/0x780\n hci_sock_ioctl+0x269/0x5f0\n\nHold hdev->lock across each lookup and all reads from its result. Copy the\nremote address before unlocking so discovery cancellation does not retain\na cache entry pointer. Release the lock before sending synchronous HCI\ncommands, since their completion handlers may need the same lock."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/hci_sync.c"], "versions": [{"version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd", "lessThan": "ddc9edb244cc8b5266595e8fc220e7813f2b603a", "status": "affected", "versionType": "git"}, {"version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd", "lessThan": "52edf1c0e59dea37b8368c4a2559dca96b2fdfea", "status": "affected", "versionType": "git"}, {"version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd", "lessThan": "333257e6e4a7bcaaea82fd357121d0f1e6b76c7b", "status": "affected", "versionType": "git"}, {"version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd", "lessThan": "a642f498f0b08f2aa9f4a69468db92f57a72349d", "status": "affected", "versionType": "git"}, {"version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd", "lessThan": "8ed67535fdff40ca652bcd4ac7da68d11d01bd34", "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_sync.c"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "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": "5.17", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.2.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ddc9edb244cc8b5266595e8fc220e7813f2b603a"}, {"url": "https://git.kernel.org/stable/c/52edf1c0e59dea37b8368c4a2559dca96b2fdfea"}, {"url": "https://git.kernel.org/stable/c/333257e6e4a7bcaaea82fd357121d0f1e6b76c7b"}, {"url": "https://git.kernel.org/stable/c/a642f498f0b08f2aa9f4a69468db92f57a72349d"}, {"url": "https://git.kernel.org/stable/c/8ed67535fdff40ca652bcd4ac7da68d11d01bd34"}], "title": "Bluetooth: hci_sync: Fix inquiry cache use-after-free", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bluetooth/hci_sync.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ddc9edb244cc8b5266595e8fc220e7813f2b603a", "status": "affected", "version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd", "versionType": "git"}, {"lessThan": "52edf1c0e59dea37b8368c4a2559dca96b2fdfea", "status": "affected", "version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd", "versionType": "git"}, {"lessThan": "333257e6e4a7bcaaea82fd357121d0f1e6b76c7b", "status": "affected", "version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd", "versionType": "git"}, {"lessThan": "a642f498f0b08f2aa9f4a69468db92f57a72349d", "status": "affected", "version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd", "versionType": "git"}, {"lessThan": "8ed67535fdff40ca652bcd4ac7da68d11d01bd34", "status": "affected", "version": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bluetooth/hci_sync.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.17"}, {"lessThan": "5.17", "status": "unaffected", "version": "0", "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_sync: Fix inquiry cache use-after-free\n\nThe sync command worker holds hdev->req_lock, but inquiry-cache updates\nand flushes use hdev->lock. Both hci_acl_create_conn_sync() and\nhci_stop_discovery_sync() look up entries and read their fields without\ntaking hdev->lock.\n\nAfter either lookup returns, a concurrent HCIINQUIRY ioctl can acquire\nhdev->lock and flush the cache, freeing the entry. The worker then reads\nthe freed entry while preparing a create-connection or remote-name-cancel\ncommand. The list traversal also races with cache updates and removal.\n\nKASAN reported these accesses:\n\n BUG: KASAN: slab-use-after-free in hci_acl_create_conn_sync+0x5f1/0x650\n Workqueue: hci0 hci_cmd_sync_work\n Call Trace:\n hci_acl_create_conn_sync+0x5f1/0x650\n hci_cmd_sync_work+0x13c/0x290\n\n Allocated by task 90:\n hci_inquiry_cache_update+0x3e6/0x7d0\n hci_inquiry_result_evt+0x3cb/0x560\n\n Freed by task 93:\n hci_inquiry_cache_flush+0x111/0x2b0\n hci_inquiry+0x2f2/0x780\n hci_sock_ioctl+0x269/0x5f0\n\n BUG: KASAN: slab-use-after-free in hci_stop_discovery_sync+0x3b1/0x3c0\n Workqueue: hci0 hci_cmd_sync_work\n Call Trace:\n hci_stop_discovery_sync+0x3b1/0x3c0\n hci_cmd_sync_work+0x173/0x300\n\n Allocated by task 86:\n hci_inquiry_cache_update+0x483/0x940\n hci_inquiry_result_evt+0x3cb/0x560\n\n Freed by task 91:\n hci_inquiry_cache_flush+0x13e/0x2f0\n hci_inquiry+0x2f2/0x780\n hci_sock_ioctl+0x269/0x5f0\n\nHold hdev->lock across each lookup and all reads from its result. Copy the\nremote address before unlocking so discovery cancellation does not retain\na cache entry pointer. Release the lock before sending synchronous HCI\ncommands, since their completion handlers may need the same lock."}], "id": "CVE-2026-98737", "lastModified": "2026-10-21T13:21:40.930", "metrics": {}, "published": "2026-10-18T16:17:27.370", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/333257e6e4a7bcaaea82fd357121d0f1e6b76c7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/52edf1c0e59dea37b8368c4a2559dca96b2fdfea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8ed67535fdff40ca652bcd4ac7da68d11d01bd34"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a642f498f0b08f2aa9f4a69468db92f57a72349d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ddc9edb244cc8b5266595e8fc220e7813f2b603a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Denial of service via Bluetooth inquiry cache use-after-free", "id": "2555088", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555088"}, "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-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: hci_sync: Fix inquiry cache use-after-free\nThe sync command worker holds hdev->req_lock, but inquiry-cache updates\nand flushes use hdev->lock. Both hci_acl_create_conn_sync() and\nhci_stop_discovery_sync() look up entries and read their fields without\ntaking hdev->lock.\nAfter either lookup returns, a concurrent HCIINQUIRY ioctl can acquire\nhdev->lock and flush the cache, freeing the entry. The worker then reads\nthe freed entry while preparing a create-connection or remote-name-cancel\ncommand. The list traversal also races with cache updates and removal.\nKASAN reported these accesses:\nBUG: KASAN: slab-use-after-free in hci_acl_create_conn_sync+0x5f1/0x650\nWorkqueue: hci0 hci_cmd_sync_work\nCall Trace:\nhci_acl_create_conn_sync+0x5f1/0x650\nhci_cmd_sync_work+0x13c/0x290\nAllocated by task 90:\nhci_inquiry_cache_update+0x3e6/0x7d0\nhci_inquiry_result_evt+0x3cb/0x560\nFreed by task 93:\nhci_inquiry_cache_flush+0x111/0x2b0\nhci_inquiry+0x2f2/0x780\nhci_sock_ioctl+0x269/0x5f0\nBUG: KASAN: slab-use-after-free in hci_stop_discovery_sync+0x3b1/0x3c0\nWorkqueue: hci0 hci_cmd_sync_work\nCall Trace:\nhci_stop_discovery_sync+0x3b1/0x3c0\nhci_cmd_sync_work+0x173/0x300\nAllocated by task 86:\nhci_inquiry_cache_update+0x483/0x940\nhci_inquiry_result_evt+0x3cb/0x560\nFreed by task 91:\nhci_inquiry_cache_flush+0x13e/0x2f0\nhci_inquiry+0x2f2/0x780\nhci_sock_ioctl+0x269/0x5f0\nHold hdev->lock across each lookup and all reads from its result. Copy the\nremote address before unlocking so discovery cancellation does not retain\na cache entry pointer. Release the lock before sending synchronous HCI\ncommands, since their completion handlers may need the same lock.", "A flaw was found in the Linux kernel's Bluetooth subsystem. This flaw allows a local user to cause a Denial of Service (DoS) or potentially escalate privileges due to a use-after-free condition. The issue arises from a race condition where synchronous command routines access inquiry cache entries without proper locking, allowing a concurrent cache flush request to free memory that is still actively in use."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-98737", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}], "public_date": "2026-10-18T15:47:14Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98737\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98737\nhttps://git.kernel.org/stable/c/333257e6e4a7bcaaea82fd357121d0f1e6b76c7b\nhttps://git.kernel.org/stable/c/52edf1c0e59dea37b8368c4a2559dca96b2fdfea\nhttps://git.kernel.org/stable/c/8ed67535fdff40ca652bcd4ac7da68d11d01bd34\nhttps://git.kernel.org/stable/c/a642f498f0b08f2aa9f4a69468db92f57a72349d\nhttps://kernelcve.org/list/?q=CVE-2026-98737"], "statement": "A race in the Bluetooth HCI inquiry cache can cause a slab use after free because synchronous command workers look up an inquiry entry and read its fields without holding hdev lock. A concurrent local HCIINQUIRY ioctl can flush the cache and free the entry before hci_acl_create_conn_sync or hci_stop_discovery_sync finishes using it. KASAN confirms reads from freed slab memory and the immediate demonstrated consequence is a kernel crash. For the CVSS the PR:L reflects that a local process needs access to Bluetooth HCI control operations which may require delegated CAP_NET_RAW or CAP_NET_ADMIN but does not necessarily require unrestricted root access. AC:H applies because reliable triggering depends on winning a race window between cache lookup and cache removal. The issue is not directly reachable by a remote network peer alone. A nearby Bluetooth device may affect inquiry cache contents but local control is still needed to flush the cache and drive the competing synchronous path. Impact is at least a local denial of service via kernel crash and in the paranoid worst case may include confidentiality or integrity impact due to reuse of freed slab memory.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cf75ad8b41d2aa06f98f365d42a3ae8b059daddd,52edf1c0e59dea37b8368c4a2559dca96b2fdfea)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cf75ad8b41d2aa06f98f365d42a3ae8b059daddd,333257e6e4a7bcaaea82fd357121d0f1e6b76c7b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cf75ad8b41d2aa06f98f365d42a3ae8b059daddd,a642f498f0b08f2aa9f4a69468db92f57a72349d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[cf75ad8b41d2aa06f98f365d42a3ae8b059daddd,8ed67535fdff40ca652bcd4ac7da68d11d01bd34)"}}], "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": "5.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.17)"}}, {"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": "semver", "value": "[7.2.10,7.3.0)"}}, {"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": "2026-10-18T20:15:14.858562+00:00", "updated": "2026-10-22T21:15:12.491732+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}