CVE-2025-38593

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-38593", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.028Z", "datePublished": "2025-08-19T17:03:18.960Z", "dateUpdated": "2026-10-15T22:02:26.347Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:03:15.011Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'\n\nFunction 'hci_discovery_filter_clear()' frees 'uuids' array and then\nsets it to NULL. There is a tiny chance of the following race:\n\n'hci_cmd_sync_work()'\n\n 'update_passive_scan_sync()'\n\n 'hci_update_passive_scan_sync()'\n\n 'hci_discovery_filter_clear()'\n kfree(uuids);\n\n <-------------------------preempted-------------------------------->\n 'start_service_discovery()'\n\n 'hci_discovery_filter_clear()'\n kfree(uuids); // DOUBLE FREE\n\n <-------------------------preempted-------------------------------->\n\n uuids = NULL;\n\nTo fix it let's add locking around 'kfree()' call and NULL pointer\nassignment. Otherwise the following backtrace fires:\n\n[ ] ------------[ cut here ]------------\n[ ] kernel BUG at mm/slub.c:547!\n[ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\n[ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1\n[ ] Tainted: [O]=OOT_MODULE\n[ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ ] pc : __slab_free+0xf8/0x348\n[ ] lr : __slab_free+0x48/0x348\n...\n[ ] Call trace:\n[ ] __slab_free+0xf8/0x348\n[ ] kfree+0x164/0x27c\n[ ] start_service_discovery+0x1d0/0x2c0\n[ ] hci_sock_sendmsg+0x518/0x924\n[ ] __sock_sendmsg+0x54/0x60\n[ ] sock_write_iter+0x98/0xf8\n[ ] do_iter_readv_writev+0xe4/0x1c8\n[ ] vfs_writev+0x128/0x2b0\n[ ] do_writev+0xfc/0x118\n[ ] __arm64_sys_writev+0x20/0x2c\n[ ] invoke_syscall+0x68/0xf0\n[ ] el0_svc_common.constprop.0+0x40/0xe0\n[ ] do_el0_svc+0x1c/0x28\n[ ] el0_svc+0x30/0xd0\n[ ] el0t_64_sync_handler+0x100/0x12c\n[ ] el0t_64_sync+0x194/0x198\n[ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000)\n[ ] ---[ end trace 0000000000000000 ]---"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires issuing MGMT_OP_START_SERVICE_DISCOVERY/START_DISCOVERY on a local AF_BLUETOOTH HCI control socket via sendmsg/writev, so the attacker must have local system access. A remote/adjacent Bluetooth peer can only pump the workqueue side of the race (via LE connect/disconnect events), not the mgmt side, so local access is mandatory.\nAC:L - The attacker drives both sides of the race from the same socket \u2014 one thread loops START_SERVICE_DISCOVERY/STOP_DISCOVERY while another loops SET_SCAN_PARAMS/SET_DEVICE_FLAGS/adv-monitor ops to queue update_passive_scan_sync() \u2014 and the free paths take disjoint locks (hci_dev_lock vs hci_req_sync_lock), so the window is reachable and retryable indefinitely on a PREEMPT SMP kernel. The crash was in fact observed spontaneously in production with ordinary bluetoothd traffic.\nPR:L - The mgmt channel requires CAP_NET_ADMIN, but in the realistic Bluetooth deployments (Android's non-root AID_BLUETOOTH service, ChromeOS/embedded/automotive BT daemons) that capability is held by an unprivileged, SELinux-confined, remotely-reachable service process rather than by root, so a compromised Bluetooth daemon \u2014 far short of full admin \u2014 suffices to reach the bug.\nUI:N - No victim action is needed; the attacker's own threads issue every mgmt command required to open and hit the race window. No pairing, mount, or user-initiated scan is involved.\nS:U - The double free corrupts kernel heap metadata within the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The double free of an attacker-sized (up to ~64 KB) and attacker-filled buffer corrupts the SLUB freelist and leaves a dangling hdev->discovery.uuids that is still dereferenced by is_filter_match()/eir_has_uuids() on the advertisement RX path, yielding a use-after-free read that can be groomed into arbitrary kernel memory disclosure.\nI:H - A double free hands the same slab object to two owners, a classic primitive for cross-cache/overlapping-allocation attacks that convert into arbitrary kernel writes and control-flow hijack; the attacker fully controls the object's size class and contents, making the grooming practical.\nA:H - The reported, directly observed consequence is a kernel BUG() in __slab_free (mm/slub.c:547) taking down the machine, and freelist corruption reliably panics the kernel even when not weaponized further."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/bluetooth/hci_core.h"], "versions": [{"version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "86f3dcd1f331cfd4fd7ec88906955134ec51afbe", "status": "affected", "versionType": "git"}, {"version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "7ce9bb0b95fc280e9212b8922590c492ca1d9c39", "status": "affected", "versionType": "git"}, {"version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "16852eccbdfaf41a666705e3f8be55cf2864c5ca", "status": "affected", "versionType": "git"}, {"version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "a351ff6b8ecca4229afaa0d98042bead8de64799", "status": "affected", "versionType": "git"}, {"version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "f8069f34c4c976786ded97498012225af87435d7", "status": "affected", "versionType": "git"}, {"version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "2935e556850e9c94d7a00adf14d3cd7fe406ac03", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/bluetooth/hci_core.h"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.159", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.42", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15.10", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.1", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17", "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": "6.1.159"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.117"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.15.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.16.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/86f3dcd1f331cfd4fd7ec88906955134ec51afbe"}, {"url": "https://git.kernel.org/stable/c/7ce9bb0b95fc280e9212b8922590c492ca1d9c39"}, {"url": "https://git.kernel.org/stable/c/16852eccbdfaf41a666705e3f8be55cf2864c5ca"}, {"url": "https://git.kernel.org/stable/c/a351ff6b8ecca4229afaa0d98042bead8de64799"}, {"url": "https://git.kernel.org/stable/c/f8069f34c4c976786ded97498012225af87435d7"}, {"url": "https://git.kernel.org/stable/c/2935e556850e9c94d7a00adf14d3cd7fe406ac03"}], "title": "Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-38593", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:52:06.790277Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T22:02:26.347Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-38593", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:52:06.790277Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:52:07.639Z"}}], "cna": {"title": "Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires issuing MGMT_OP_START_SERVICE_DISCOVERY/START_DISCOVERY on a local AF_BLUETOOTH HCI control socket via sendmsg/writev, so the attacker must have local system access. A remote/adjacent Bluetooth peer can only pump the workqueue side of the race (via LE connect/disconnect events), not the mgmt side, so local access is mandatory.\nAC:L - The attacker drives both sides of the race from the same socket \u2014 one thread loops START_SERVICE_DISCOVERY/STOP_DISCOVERY while another loops SET_SCAN_PARAMS/SET_DEVICE_FLAGS/adv-monitor ops to queue update_passive_scan_sync() \u2014 and the free paths take disjoint locks (hci_dev_lock vs hci_req_sync_lock), so the window is reachable and retryable indefinitely on a PREEMPT SMP kernel. The crash was in fact observed spontaneously in production with ordinary bluetoothd traffic.\nPR:L - The mgmt channel requires CAP_NET_ADMIN, but in the realistic Bluetooth deployments (Android's non-root AID_BLUETOOTH service, ChromeOS/embedded/automotive BT daemons) that capability is held by an unprivileged, SELinux-confined, remotely-reachable service process rather than by root, so a compromised Bluetooth daemon \u2014 far short of full admin \u2014 suffices to reach the bug.\nUI:N - No victim action is needed; the attacker's own threads issue every mgmt command required to open and hit the race window. No pairing, mount, or user-initiated scan is involved.\nS:U - The double free corrupts kernel heap metadata within the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The double free of an attacker-sized (up to ~64 KB) and attacker-filled buffer corrupts the SLUB freelist and leaves a dangling hdev->discovery.uuids that is still dereferenced by is_filter_match()/eir_has_uuids() on the advertisement RX path, yielding a use-after-free read that can be groomed into arbitrary kernel memory disclosure.\nI:H - A double free hands the same slab object to two owners, a classic primitive for cross-cache/overlapping-allocation attacks that convert into arbitrary kernel writes and control-flow hijack; the attacker fully controls the object's size class and contents, making the grooming practical.\nA:H - The reported, directly observed consequence is a kernel BUG() in __slab_free (mm/slub.c:547) taking down the machine, and freelist corruption reliably panics the kernel even when not weaponized further."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "86f3dcd1f331cfd4fd7ec88906955134ec51afbe", "versionType": "git"}, {"status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "7ce9bb0b95fc280e9212b8922590c492ca1d9c39", "versionType": "git"}, {"status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "16852eccbdfaf41a666705e3f8be55cf2864c5ca", "versionType": "git"}, {"status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "a351ff6b8ecca4229afaa0d98042bead8de64799", "versionType": "git"}, {"status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "f8069f34c4c976786ded97498012225af87435d7", "versionType": "git"}, {"status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "lessThan": "2935e556850e9c94d7a00adf14d3cd7fe406ac03", "versionType": "git"}], "programFiles": ["include/net/bluetooth/hci_core.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.17"}, {"status": "unaffected", "version": "0", "lessThan": "5.17", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.159", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.117", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.42", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.15.10", "versionType": "semver", "lessThanOrEqual": "6.15.*"}, {"status": "unaffected", "version": "6.16.1", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["include/net/bluetooth/hci_core.h"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/86f3dcd1f331cfd4fd7ec88906955134ec51afbe"}, {"url": "https://git.kernel.org/stable/c/7ce9bb0b95fc280e9212b8922590c492ca1d9c39"}, {"url": "https://git.kernel.org/stable/c/16852eccbdfaf41a666705e3f8be55cf2864c5ca"}, {"url": "https://git.kernel.org/stable/c/a351ff6b8ecca4229afaa0d98042bead8de64799"}, {"url": "https://git.kernel.org/stable/c/f8069f34c4c976786ded97498012225af87435d7"}, {"url": "https://git.kernel.org/stable/c/2935e556850e9c94d7a00adf14d3cd7fe406ac03"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'\n\nFunction 'hci_discovery_filter_clear()' frees 'uuids' array and then\nsets it to NULL. There is a tiny chance of the following race:\n\n'hci_cmd_sync_work()'\n\n 'update_passive_scan_sync()'\n\n 'hci_update_passive_scan_sync()'\n\n 'hci_discovery_filter_clear()'\n kfree(uuids);\n\n <-------------------------preempted-------------------------------->\n 'start_service_discovery()'\n\n 'hci_discovery_filter_clear()'\n kfree(uuids); // DOUBLE FREE\n\n <-------------------------preempted-------------------------------->\n\n uuids = NULL;\n\nTo fix it let's add locking around 'kfree()' call and NULL pointer\nassignment. Otherwise the following backtrace fires:\n\n[ ] ------------[ cut here ]------------\n[ ] kernel BUG at mm/slub.c:547!\n[ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\n[ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1\n[ ] Tainted: [O]=OOT_MODULE\n[ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ ] pc : __slab_free+0xf8/0x348\n[ ] lr : __slab_free+0x48/0x348\n...\n[ ] Call trace:\n[ ] __slab_free+0xf8/0x348\n[ ] kfree+0x164/0x27c\n[ ] start_service_discovery+0x1d0/0x2c0\n[ ] hci_sock_sendmsg+0x518/0x924\n[ ] __sock_sendmsg+0x54/0x60\n[ ] sock_write_iter+0x98/0xf8\n[ ] do_iter_readv_writev+0xe4/0x1c8\n[ ] vfs_writev+0x128/0x2b0\n[ ] do_writev+0xfc/0x118\n[ ] __arm64_sys_writev+0x20/0x2c\n[ ] invoke_syscall+0x68/0xf0\n[ ] el0_svc_common.constprop.0+0x40/0xe0\n[ ] do_el0_svc+0x1c/0x28\n[ ] el0_svc+0x30/0xd0\n[ ] el0t_64_sync_handler+0x100/0x12c\n[ ] el0t_64_sync+0x194/0x198\n[ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000)\n[ ] ---[ end trace 0000000000000000 ]---"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.159", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.117", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.42", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.15.10", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.16.1", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.17", "versionStartIncluding": "5.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:03:15.011Z"}}}, "cveMetadata": {"cveId": "CVE-2025-38593", "state": "PUBLISHED", "dateUpdated": "2026-10-15T22:02:26.347Z", "dateReserved": "2025-04-16T04:51:24.028Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-08-19T17:03:18.960Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/net/bluetooth/hci_core.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "86f3dcd1f331cfd4fd7ec88906955134ec51afbe", "status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "versionType": "git"}, {"lessThan": "7ce9bb0b95fc280e9212b8922590c492ca1d9c39", "status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "versionType": "git"}, {"lessThan": "16852eccbdfaf41a666705e3f8be55cf2864c5ca", "status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "versionType": "git"}, {"lessThan": "a351ff6b8ecca4229afaa0d98042bead8de64799", "status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "versionType": "git"}, {"lessThan": "f8069f34c4c976786ded97498012225af87435d7", "status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "versionType": "git"}, {"lessThan": "2935e556850e9c94d7a00adf14d3cd7fe406ac03", "status": "affected", "version": "ad383c2c65a5baf16e334cd40a013cc302176891", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/net/bluetooth/hci_core.h"], "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": "6.1.*", "status": "unaffected", "version": "6.1.159", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.117", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.42", "versionType": "semver"}, {"lessThanOrEqual": "6.15.*", "status": "unaffected", "version": "6.15.10", "versionType": "semver"}, {"lessThanOrEqual": "6.16.*", "status": "unaffected", "version": "6.16.1", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F49D8AA9-5368-43A4-94F6-B809322B4E8F", "versionEndExcluding": "6.6.117", "versionStartIncluding": "5.17", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "EA7AA5E6-4376-4A85-A021-6ACC5FF801C3", "versionEndExcluding": "6.12.42", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5890C690-B295-40C2-9121-FF5F987E5142", "versionEndExcluding": "6.15.10", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "58182352-D7DF-4CC9-841E-03C1D852C3FB", "versionEndExcluding": "6.16.1", "versionStartIncluding": "6.16", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'\n\nFunction 'hci_discovery_filter_clear()' frees 'uuids' array and then\nsets it to NULL. There is a tiny chance of the following race:\n\n'hci_cmd_sync_work()'\n\n 'update_passive_scan_sync()'\n\n 'hci_update_passive_scan_sync()'\n\n 'hci_discovery_filter_clear()'\n kfree(uuids);\n\n <-------------------------preempted-------------------------------->\n 'start_service_discovery()'\n\n 'hci_discovery_filter_clear()'\n kfree(uuids); // DOUBLE FREE\n\n <-------------------------preempted-------------------------------->\n\n uuids = NULL;\n\nTo fix it let's add locking around 'kfree()' call and NULL pointer\nassignment. Otherwise the following backtrace fires:\n\n[ ] ------------[ cut here ]------------\n[ ] kernel BUG at mm/slub.c:547!\n[ ] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\n[ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1\n[ ] Tainted: [O]=OOT_MODULE\n[ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ ] pc : __slab_free+0xf8/0x348\n[ ] lr : __slab_free+0x48/0x348\n...\n[ ] Call trace:\n[ ] __slab_free+0xf8/0x348\n[ ] kfree+0x164/0x27c\n[ ] start_service_discovery+0x1d0/0x2c0\n[ ] hci_sock_sendmsg+0x518/0x924\n[ ] __sock_sendmsg+0x54/0x60\n[ ] sock_write_iter+0x98/0xf8\n[ ] do_iter_readv_writev+0xe4/0x1c8\n[ ] vfs_writev+0x128/0x2b0\n[ ] do_writev+0xfc/0x118\n[ ] __arm64_sys_writev+0x20/0x2c\n[ ] invoke_syscall+0x68/0xf0\n[ ] el0_svc_common.constprop.0+0x40/0xe0\n[ ] do_el0_svc+0x1c/0x28\n[ ] el0_svc+0x30/0xd0\n[ ] el0t_64_sync_handler+0x100/0x12c\n[ ] el0t_64_sync+0x194/0x198\n[ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000)\n[ ] ---[ end trace 0000000000000000 ]---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Bluetooth: hci_sync: corrige la doble liberaci\u00f3n en 'hci_discovery_filter_clear()' La funci\u00f3n 'hci_discovery_filter_clear()' libera la matriz 'uuids' y luego la establece en NULL. Hay una peque\u00f1a posibilidad de la siguiente ejecuci\u00f3n: 'hci_cmd_sync_work()' 'update_passive_scan_sync()' 'hci_update_passive_scan_sync()' 'hci_discovery_filter_clear()' kfree(uuids); &lt;-------------------------preempted--------------------------------&gt; 'start_service_discovery()' 'hci_discovery_filter_clear()' kfree(uuids); // DOBLE LIBERACI\u00d3N &lt;-------------------------preempted--------------------------------&gt; uuids = NULL; Para solucionarlo, agreguemos un bloqueo alrededor de la llamada 'kfree()' y la asignaci\u00f3n del puntero NULL. De lo contrario, se activa el siguiente backtrace: [ ] ------------[ cortar aqu\u00ed ]------------ [ ] \u00a1ERROR del kernel en mm/slub.c:547! [ ] Error interno: Ups - ERROR: 00000000f2000800 [#1] PREEMPT SMP [ ] CPU: 3 UID: 0 PID: 246 Comm: bluetoothd Tainted: G O 6.12.19-kernel #1 [ ] Tainted: [O]=OOT_MODULE [ ] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ ] pc : __slab_free+0xf8/0x348 [ ] lr : __slab_free+0x48/0x348 ... [ ] Call trace: [ ] __slab_free+0xf8/0x348 [ ] kfree+0x164/0x27c [ ] start_service_discovery+0x1d0/0x2c0 [ ] hci_sock_sendmsg+0x518/0x924 [ ] __sock_sendmsg+0x54/0x60 [ ] sock_write_iter+0x98/0xf8 [ ] do_iter_readv_writev+0xe4/0x1c8 [ ] vfs_writev+0x128/0x2b0 [ ] do_writev+0xfc/0x118 [ ] __arm64_sys_writev+0x20/0x2c [ ] invoke_syscall+0x68/0xf0 [ ] el0_svc_common.constprop.0+0x40/0xe0 [ ] do_el0_svc+0x1c/0x28 [ ] el0_svc+0x30/0xd0 [ ] el0t_64_sync_handler+0x100/0x12c [ ] el0t_64_sync+0x194/0x198 [ ] Code: 8b0002e6 eb17031f 54fffbe1 d503201f (d4210000) [ ] ---[ end trace 0000000000000000 ]-]---"}], "id": "CVE-2025-38593", "lastModified": "2026-10-15T22:18:46.633", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38593", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:52:06.790277Z", "version": "2.0.3"}}]}, "published": "2025-08-19T17:15:37.067", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/16852eccbdfaf41a666705e3f8be55cf2864c5ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2935e556850e9c94d7a00adf14d3cd7fe406ac03"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ce9bb0b95fc280e9212b8922590c492ca1d9c39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/86f3dcd1f331cfd4fd7ec88906955134ec51afbe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a351ff6b8ecca4229afaa0d98042bead8de64799"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f8069f34c4c976786ded97498012225af87435d7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'", "id": "2389504", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2389504"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-38593", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-08-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38593\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38593\nhttps://lore.kernel.org/linux-cve-announce/2025081918-CVE-2025-38593-22c2@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-08-21T12:31:52.776751+00:00", "updated": "2025-08-21T12:31:52.776799+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}