{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49470", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.578Z", "datePublished": "2025-02-26T02:13:14.024Z", "dateUpdated": "2026-08-05T08:55:18.200Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:55:18.200Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btmtksdio: fix use-after-free at btmtksdio_recv_event\n\nWe should not access skb buffer data anymore after hci_recv_frame was\ncalled.\n\n[ 39.634809] BUG: KASAN: use-after-free in btmtksdio_recv_event+0x1b0\n[ 39.634855] Read of size 1 at addr ffffff80cf28a60d by task kworker\n[ 39.634962] Call trace:\n[ 39.634974] dump_backtrace+0x0/0x3b8\n[ 39.634999] show_stack+0x20/0x2c\n[ 39.635016] dump_stack_lvl+0x60/0x78\n[ 39.635040] print_address_description+0x70/0x2f0\n[ 39.635062] kasan_report+0x154/0x194\n[ 39.635079] __asan_report_load1_noabort+0x44/0x50\n[ 39.635099] btmtksdio_recv_event+0x1b0/0x1c4\n[ 39.635129] btmtksdio_txrx_work+0x6cc/0xac4\n[ 39.635157] process_one_work+0x560/0xc5c\n[ 39.635177] worker_thread+0x7ec/0xcc0\n[ 39.635195] kthread+0x2d0/0x3d0\n[ 39.635215] ret_from_fork+0x10/0x20\n[ 39.635247] Allocated by task 0:\n[ 39.635260] (stack is not available)\n[ 39.635281] Freed by task 2392:\n[ 39.635295] kasan_save_stack+0x38/0x68\n[ 39.635319] kasan_set_track+0x28/0x3c\n[ 39.635338] kasan_set_free_info+0x28/0x4c\n[ 39.635357] ____kasan_slab_free+0x104/0x150\n[ 39.635374] __kasan_slab_free+0x18/0x28\n[ 39.635391] slab_free_freelist_hook+0x114/0x248\n[ 39.635410] kfree+0xf8/0x2b4\n[ 39.635427] skb_free_head+0x58/0x98\n[ 39.635447] skb_release_data+0x2f4/0x410\n[ 39.635464] skb_release_all+0x50/0x60\n[ 39.635481] kfree_skb+0xc8/0x25c\n[ 39.635498] hci_event_packet+0x894/0xca4 [bluetooth]\n[ 39.635721] hci_rx_work+0x1c8/0x68c [bluetooth]\n[ 39.635925] process_one_work+0x560/0xc5c\n[ 39.635951] worker_thread+0x7ec/0xcc0\n[ 39.635970] kthread+0x2d0/0x3d0\n[ 39.635990] ret_from_fork+0x10/0x20\n[ 39.636021] The buggy address belongs to the object at ffffff80cf28a600\n which belongs to the cache kmalloc-512 of size 512\n[ 39.636039] The buggy address is located 13 bytes inside of\n 512-byte region [ffffff80cf28a600, ffffff80cf28a800)" } ], "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 - The vulnerable code processes HCI events delivered from the MediaTek Bluetooth controller over SDIO in response to radio activity; an attacker on the same Bluetooth segment can induce those events (e.g., advertising/connection-related HCI events) without local system access.\nAC:L - Any HCI event through btmtksdio_recv_event races the hdr->evt read against hci_rx_work freeing the skb; an adjacent attacker can flood events to trigger the race, and on preemptible kernels (typical for MediaTek phone deployments) the race is reliably hit as shown by the KASAN report.\nPR:N - Exploitation requires only adjacent Bluetooth radio reachability to cause the controller to emit HCI events; no credentials or local privileges on the victim host are needed.\nUI:N - No victim action is required beyond Bluetooth already being enabled and the btmtksdio device being operational, which is the normal attack-surface state for phones and IoT devices using these chips.\nS:U - The UAF corrupts/abuses kernel heap memory within the same kernel privilege boundary; it does not cross VM, IOMMU, or other separate security authorities.\nC:H - This is a use-after-free on a kmalloc-512 skb data object; reclaiming the freed object gives an attacker control over the stale read and enables information-disclosure primitives consistent with kernel UAF exploitation.\nI:H - Kernel UAF on the skb enables heap spraying and control of subsequent use of the freed object (including falsely matching HCI_EV_WMT and corrupting driver wait-state handling), supporting arbitrary write/control-flow hijack primitives.\nA:H - Use-after-free of skb data can cause kernel oops/panic when the reclaimed or poisoned memory is accessed, and the KASAN report confirms the invalid post-free access in btmtksdio_recv_event." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/bluetooth/btmtksdio.c" ], "versions": [ { "version": "9aebfd4a2200ab8075e44379c758bccefdc589bb", "lessThan": "b3cec8a42fcd11d05313c724f27e01b1db77522c", "status": "affected", "versionType": "git" }, { "version": "9aebfd4a2200ab8075e44379c758bccefdc589bb", "lessThan": "02ba31e09a26e8cd4582ac8e6163d80284997727", "status": "affected", "versionType": "git" }, { "version": "9aebfd4a2200ab8075e44379c758bccefdc589bb", "lessThan": "01c6a899fa6be4f4cbf60c4f44f0f6691155415f", "status": "affected", "versionType": "git" }, { "version": "9aebfd4a2200ab8075e44379c758bccefdc589bb", "lessThan": "0fab6361c4ba17d1b43a991bef4238a3c1754d35", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/bluetooth/btmtksdio.c" ], "versions": [ { "version": "5.2", "status": "affected" }, { "version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.54", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.14", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "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": "5.2", "versionEndExcluding": "5.15.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.17.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.18.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b3cec8a42fcd11d05313c724f27e01b1db77522c" }, { "url": "https://git.kernel.org/stable/c/02ba31e09a26e8cd4582ac8e6163d80284997727" }, { "url": "https://git.kernel.org/stable/c/01c6a899fa6be4f4cbf60c4f44f0f6691155415f" }, { "url": "https://git.kernel.org/stable/c/0fab6361c4ba17d1b43a991bef4238a3c1754d35" } ], "title": "Bluetooth: btmtksdio: fix use-after-free at btmtksdio_recv_event", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-49470", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-27T18:15:58.795301Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-27T18:22:32.566Z" } } ] } }