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CVE-2026-63975— Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp

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.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 5.7版本存在安全漏洞，该漏洞源于蓝牙L2CAP协议中的l2cap_ecred_conn_rsp函数处理逻辑问题，当收到已分配目标CID的dcid时，可能导致系统崩溃。

CVSS 8.8 · High EPSS 0.35% · P28

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 15f02b91056253e8cdc592888f431da0731337b8< 3c8eaa91eb433c450426539290be4ffe282e9f00 affected
15f02b91056253e8cdc592888f431da0731337b8< ecfed1e0d8efecad6737a0d83e21d2fd021d8c48 affected
15f02b91056253e8cdc592888f431da0731337b8< e6833e737a51db1e5ea0401322acf5e22abd8be6 affected
15f02b91056253e8cdc592888f431da0731337b8< 6319b38fe69f56ed95680ade485b957a53fff642 affected
15f02b91056253e8cdc592888f431da0731337b8< 291eec1041c918c460dc9702e44edd17794b4a4b affected
15f02b91056253e8cdc592888f431da0731337b8< 41e29548b5e8b5e5fcf708786b3bea67cab107fa affected
15f02b91056253e8cdc592888f431da0731337b8< d153b8898c0051eb8b6a083b35cbe304a5886bd5 affected
15f02b91056253e8cdc592888f431da0731337b8< 41c2713b204e6cb6a94587bc6bf6935107df5479 affected
… +10 more rows
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I. Basic Information for CVE-2026-63975

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp If dcid is received for an already-assigned destination CID the spec requires that both channels to be discarded, but calling l2cap_chan_del may invalidate the tmp cursor created by list_for_each_entry_safe and in fact it is the wrong procedure as the chan->dcid may be assigned previously it really needs to be disconnected. Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so instead schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 5.7版本存在安全漏洞，该漏洞源于蓝牙L2CAP协议中的l2cap_ecred_conn_rsp函数处理逻辑问题，当收到已分配目标CID的dcid时，可能导致系统崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 15f02b91056253e8cdc592888f431da0731337b8 ~ 3c8eaa91eb433c450426539290be4ffe282e9f00 -
Linux Linux 5.7 -

II. Public POCs for CVE-2026-63975

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III. Intelligence Information for CVE-2026-63975

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Patches & Fixes for CVE-2026-63975 (8)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64061 9.8 CRITICAL netfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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