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CVE-2026-97977— Bluetooth: btusb: Fix UAF of btusb_data by rx_work

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： 蓝牙：btusb：修复 rx_work 对 btusb_data 的使用后释放（UAF）问题 和 使用异步的 取消 。因此，如果 已在另一个 CPU 上运行，则在 返回后它仍会继续执行。 会调用 ，进而触发 ，随后释放 结构体。此时，仍在运行的 将访问已被释放的 ，导致如下代码中出现悬垂指针解引用： 为解决此问题，应改用 。此外，在 中，该取消操作必须在 之后执行，否则一个与取消操作竞态的 URB 完成处理程序可能在实际等待取消之后立即重新调度工作项，从而再次引入竞争条件。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 800fe5ec302e1ebbf5e3f891f886deecd49c7132< fc654a72a8d979db15e2773a481e931abaf5a9e8 affected
800fe5ec302e1ebbf5e3f891f886deecd49c7132< 5242050195a711e9cd6a9935f689ab6656b94a91 affected
800fe5ec302e1ebbf5e3f891f886deecd49c7132< 472d005622525b7be155cac99dde2252b0163bd1 affected
800fe5ec302e1ebbf5e3f891f886deecd49c7132< 93b59937bda3fffc6386c79f5544a39bc680c8e8 affected
800fe5ec302e1ebbf5e3f891f886deecd49c7132< fa391adb9c755515a89993634745e9079e5ef37c affected
800fe5ec302e1ebbf5e3f891f886deecd49c7132< 1c12c3117639e78940959d956519c758c57d0849 affected
5.17 affected
< 5.17 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-97977

Vulnerability Information
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Vulnerability Title
Bluetooth: btusb: Fix UAF of btusb_data by rx_work
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: Fix UAF of btusb_data by rx_work btusb_close() and btusb_flush() cancel data->rx_work with the asynchronous cancel_delayed_work(), so if btusb_rx_work() is already running on another CPU it keeps running after the cancel returns. btusb_disconnect() calls hci_unregister_dev(), which invokes btusb_close(), and then frees the btusb_data. A still running btusb_rx_work() then dereferences the freed data: while ((skb = skb_dequeue(&data->acl_q))) data->recv_acl(data->hdev, skb); Use cancel_delayed_work_sync() instead. In btusb_close() the cancel also has to happen after btusb_stop_traffic(), otherwise an URB completion racing with the cancel can requeue the work right after it has been waited for.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 800fe5ec302e1ebbf5e3f891f886deecd49c7132 ~ fc654a72a8d979db15e2773a481e931abaf5a9e8 -
Linux Linux 5.17 -

II. Public POCs for CVE-2026-97977

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III. Intelligence Information for CVE-2026-97977

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Patches & Fixes for CVE-2026-97977 (6)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-97937 7.8 HIGH ftrace: fork: Initialize function graph state before copy_exec_state()
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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