{"id":"DEBIAN-CVE-2026-31500","details":"In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock  btintel_hw_error() issues two __hci_cmd_sync() calls (HCI_OP_RESET and Intel exception-info retrieval) without holding hci_req_sync_lock().  This lets it race against hci_dev_do_close() -\u003e btintel_shutdown_combined(), which also runs __hci_cmd_sync() under the same lock.  When both paths manipulate hdev-\u003ereq_status/req_rsp concurrently, the close path may free the response skb first, and the still-running hw_error path hits a slab-use-after-free in kfree_skb().  Wrap the whole recovery sequence in hci_req_sync_lock/unlock so it is serialized with every other synchronous HCI command issuer.  Below is the data race report and the kasan report:    BUG: data-race in __hci_cmd_sync_sk / btintel_shutdown_combined    read of hdev-\u003ereq_rsp at net/bluetooth/hci_sync.c:199   by task kworker/u17:1/83:    __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200    __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223    btintel_hw_error+0x114/0x670 drivers/bluetooth/btintel.c:254    hci_error_reset+0x348/0xa30 net/bluetooth/hci_core.c:1030    write/free by task ioctl/22580:    btintel_shutdown_combined+0xd0/0x360     drivers/bluetooth/btintel.c:3648    hci_dev_close_sync+0x9ae/0x2c10 net/bluetooth/hci_sync.c:5246    hci_dev_do_close+0x232/0x460 net/bluetooth/hci_core.c:526    BUG: KASAN: slab-use-after-free in    sk_skb_reason_drop+0x43/0x380 net/core/skbuff.c:1202   Read of size 4 at addr ffff888144a738dc   by task kworker/u17:1/83:    __hci_cmd_sync_sk+0x12f2/0x1c30 net/bluetooth/hci_sync.c:200    __hci_cmd_sync+0x55/0x80 net/bluetooth/hci_sync.c:223    btintel_hw_error+0x186/0x670 drivers/bluetooth/btintel.c:260","modified":"2026-09-01T16:06:37.837181610Z","published":"2026-04-22T14:16:48.427Z","upstream":["CVE-2026-31500"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-31500"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.176-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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