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CVE-2026-43062— Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于l2cap_ecred_reconf_rsp函数类型混淆，可能导致有效数据包被拒绝或读取错误的结果。

CVSS 7.1 · High EPSS 0.21% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 15f02b91056253e8cdc592888f431da0731337b8< 21d3ba696918d6373233aac0b9d51fcabdedddc0 affected
15f02b91056253e8cdc592888f431da0731337b8< 3b94e62caa1dc1198d0d55d97bd710da1dee15d7 affected
15f02b91056253e8cdc592888f431da0731337b8< 111f74547eee8cfedfb854284e80f35c8a491186 affected
15f02b91056253e8cdc592888f431da0731337b8< dd3b221e21079ade8263fbb7176f3d55ad75d3b6 affected
15f02b91056253e8cdc592888f431da0731337b8< d90150c72d2e6a8a3079e88755dafcfbe91c746d affected
15f02b91056253e8cdc592888f431da0731337b8< 5a1ea296f8589ce8f1e3141b2b123b34ad010e19 affected
15f02b91056253e8cdc592888f431da0731337b8< f110b8f58b254bf997cec1bd60701b7798e9bb82 affected
15f02b91056253e8cdc592888f431da0731337b8< 15145675690cab2de1056e7ed68e59cbd0452529 affected
… +10 more rows
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I. Basic Information for CVE-2026-43062

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp() l2cap_ecred_reconf_rsp() casts the incoming data to struct l2cap_ecred_conn_rsp (the ECRED *connection* response, 8 bytes with result at offset 6) instead of struct l2cap_ecred_reconf_rsp (2 bytes with result at offset 0). This causes two problems: - The sizeof(*rsp) length check requires 8 bytes instead of the correct 2, so valid L2CAP_ECRED_RECONF_RSP packets are rejected with -EPROTO. - rsp->result reads from offset 6 instead of offset 0, returning wrong data when the packet is large enough to pass the check. Fix by using the correct type. Also pass the already byte-swapped result variable to BT_DBG instead of the raw __le16 field.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于l2cap_ecred_reconf_rsp函数类型混淆，可能导致有效数据包被拒绝或读取错误的结果。
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 ~ 21d3ba696918d6373233aac0b9d51fcabdedddc0 -
Linux Linux 5.7 -

II. Public POCs for CVE-2026-43062

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III. Intelligence Information for CVE-2026-43062

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Patches & Fixes for CVE-2026-43062 (8)

Same Patch Batch · Linux · 2026-05-05 · 15 CVEs total

CVE-2026-43067 9.8 CRITICAL ext4: handle wraparound when searching for blocks for indirect mapped blocks
CVE-2026-43071 9.1 CRITICAL dcache: Limit the minimal number of bucket to two
CVE-2026-43070 7.8 HIGH bpf: Reset register ID for BPF_END value tracking
CVE-2026-43063 7.8 HIGH xfs: don't irele after failing to iget in xfs_attri_recover_work
CVE-2026-43060 7.8 HIGH netfilter: nft_ct: drop pending enqueued packets on removal
CVE-2026-43073 x86-64: rename misleadingly named '__copy_user_nocache()' function
CVE-2026-43072 drm/vc4: platform_get_irq_byname() returns an int
CVE-2026-43069 Bluetooth: hci_ll: Fix firmware leak on error path
CVE-2026-43068 ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal()
CVE-2026-43066 ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths
CVE-2026-43065 ext4: always drain queued discard work in ext4_mb_release()
CVE-2026-43064 dmaengine: idxd: Fix not releasing workqueue on .release()
CVE-2026-43061 serial: 8250: Fix TX deadlock when using DMA
CVE-2026-43059 Bluetooth: MGMT: Fix list corruption and UAF in command complete handlers

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43062

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