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CVE-2026-93783— Bluetooth: RFCOMM: validate skb length in rfcomm_recv_frame

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，以下漏洞已得到修复： 蓝牙：RFCOMM：在 中验证 skb 长度 函数将 强制转换为 类型，并访问 和 ，但未首先验证 。当帧数据被截断（即 小于最小头部长度）时，会导致对未初始化内存的越界读取。此外，零长度帧会导致 下溢为 ，使 在缓冲区之外far（大幅）读取。 提交 （“蓝牙：RFCOMM：在 MCC 处理程序中验证 skb 长度”）修复了 MCC 子处理程序中同类缺失长度检查的 bug，但顶层的 未被修复。KMSAN 报告如下： BUG: KMSAN: uninit-value in

AI Predicted 7.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< fb40eda15122f6b780228639c1ead6820340ff54 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3829af5fab5a22405bf1e7d69068c2ec0fce46ca affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b161eacd7fa4a2d765724b5504ac6cc388e48f80 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 30d1d9f3495463f7c026e4c553127f79b486fcd6 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 67dc3b40fae71b6b11c71e7ff69bac0758818c05 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< bbc310caa2b6bf5fe42896ba27da0fbc12e4ac51 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b230e5bf501c5edaf2eb0991cb862ac142031d4b affected
2.6.12 affected
… +8 more rows
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I. Basic Information for CVE-2026-93783

Vulnerability Information
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Vulnerability Title
Bluetooth: RFCOMM: validate skb length in rfcomm_recv_frame
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: validate skb length in rfcomm_recv_frame rfcomm_recv_frame() casts skb->data to struct rfcomm_hdr and dereferences hdr->addr and hdr->ctrl without validating skb->len first. A truncated frame with skb->len less than the minimum header size causes an out-of-bounds read of uninitialized memory. Additionally, a zero-length frame causes skb->len-- to underflow to UINT_MAX, making skb_tail_pointer() read far past the buffer. Commit 23882b828c3c ("Bluetooth: RFCOMM: validate skb length in MCC handlers") fixed the same class of missing-length-check bugs in the MCC sub-handlers, but the top-level rfcomm_recv_frame() was left unfixed. KMSAN reports: BUG: KMSAN: uninit-value in rfcomm_run ... Uninit was created at: __alloc_skb+0x474/0xb60 vhci_write+0xe9/0x870 Fix this by rejecting frames smaller than sizeof(struct rfcomm_hdr) + 1 (the minimum frame must have a 3-byte header and a 1-byte FCS).
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 ~ fb40eda15122f6b780228639c1ead6820340ff54 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-93783

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III. Intelligence Information for CVE-2026-93783

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Patches & Fixes for CVE-2026-93783 (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-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93786 8.1 HIGH ksmbd: preserve VFS inherited POSIX ACL mask
CVE-2026-93787 8.1 HIGH smb: client: bound dirent name against end of SMB response in cifs_filldir

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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