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CVE-2026-97408— Bluetooth: L2CAP: validate connectionless PSM length

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 L2CAP：验证无连接 PSM 的长度 无连接 L2CAP 帧在其载荷起始位置携带一个两字节的 PSM（协议标识符）。目前， 函数在仅验证外层 L2CAP 长度后，会无条件地读取该 PSM。 因此，一个载荷长度为零或一字节的畸形无连接帧，会导致解析器读取超出已通告的 skb 载荷范围，并将尾部预留空间（tailroom）中的字节误用为 PSM 的一部分。通过基于 VHCI 的 QEMU 复现工具注入一个一字节的无连接载荷，成功触发了该未受检查的内存读取漏洞。 本修复在

AI Predicted 7.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1200 · Hardware Additions

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8104cd9859b6de0826cffa68adf2c1461185823b affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 22fc1ce4e37c81d4e7aac01566ebdc232214540d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 72e26293a231f63a856340d3a1f0f5fc29bf87e5 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3502ede8aed3c3ee1786d952a11054ac737d1a38 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ae69dca122f6d6046a68cf40153e6e827c77ff5c affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a40a5f922546b3bd7c094d882b29177db4f2abe0 affected
2.6.12 affected
… +8 more rows
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I. Basic Information for CVE-2026-97408

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: validate connectionless PSM length
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: validate connectionless PSM length Connectionless L2CAP frames carry a two-byte PSM at the start of the payload. l2cap_recv_frame() currently reads that PSM unconditionally after validating only the outer L2CAP length. A malformed connectionless frame with a zero- or one-byte payload can therefore make the parser read beyond the advertised skb payload and use tailroom bytes as part of the PSM. A VHCI-backed QEMU reproducer injected a one-byte connectionless payload and reached the unchecked read. Reject connectionless frames that cannot contain the PSM before reading or pulling it. This preserves all valid connectionless frames while dropping only structurally incomplete packets.
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 8104cd9859b6de0826cffa68adf2c1461185823b -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-97408

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III. Intelligence Information for CVE-2026-97408

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Patches & Fixes for CVE-2026-97408 (7)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93787 8.1 HIGH smb: client: bound dirent name against end of SMB response in cifs_filldir
CVE-2026-93786 8.1 HIGH ksmbd: preserve VFS inherited POSIX ACL mask

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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