CVE-2026-31393

HIGH EPSS 16.8%
Published Apr 3, 20262mo ago · Modified Jun 17, 20262w ago
8.1 CVSS 3.1
High
Find Similar
Published Apr 3, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access l2cap_information_rsp() checks that cmd_len covers the fixed l2cap_info_rsp header (type + result, 4 bytes) but then reads rsp->data without verifying that the payload is present: - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp->data), which reads 4 bytes past the header (needs cmd_len >= 8). - L2CAP_IT_FIXED_CHAN reads rsp->data[0], 1 byte past the header (needs cmd_len >= 5). A truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an out-of-bounds read of adjacent skb data. Guard each data access with the required payload length check. If the payload is too short, skip the read and let the state machine complete with safe defaults (feat_mask and remote_fixed_chan remain zero from kzalloc), so the info timer cleanup and l2cap_conn_start() still run and the connection is not stalled.

CVSS Details

Base Score
8.1
Exploitability
2.8
Impact
5.2
Vector string
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack Vector Adjacent
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
16.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥2.6.24  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.167
linuxlinux_kernel*≥6.2  –  <6.6.130
linuxlinux_kernel*≥6.7  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.20
linuxlinux_kernel*≥6.19  –  <6.19.10
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/187e6fe939295be36063a1d91f8bebee04399a8c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3b646516cba2ebc4b51a72954903326e7c1e443f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5229e7d15771eac2b5886bfb1f976aea0c1eec14
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/807bd1258453c4c83f6ae9dbc1e7b44860ff40d0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9aeacde4da0f02d42fd968fd32f245828b230171
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/db2872d054e467810078e2b9f440a5b326a601b2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dd815e6e3918dc75a49aaabac36e4f024d675101
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e7ff754e339e3d5ce29aa9f95352d0186df8fbd9
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/187e6fe939295be36063a1d91f8bebee04399a8c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3b646516cba2ebc4b51a72954903326e7c1e443f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5229e7d15771eac2b5886bfb1f976aea0c1eec14
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/807bd1258453c4c83f6ae9dbc1e7b44860ff40d0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9aeacde4da0f02d42fd968fd32f245828b230171
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/db2872d054e467810078e2b9f440a5b326a601b2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dd815e6e3918dc75a49aaabac36e4f024d675101
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e7ff754e339e3d5ce29aa9f95352d0186df8fbd9
    Patch