CVE-2026-31513
개요
A flaw was found in the Linux kernel's Bluetooth L2CAP (Logical Link Control and Adaptation Protocol) component. A remote attacker can send a specially crafted Enhanced Credit Based Connection Request with an excessive number of Source Channel IDs (SCIDs). This can cause a stack-out-of-bounds read when processing the malformed request, leading to a kernel panic and a Denial of Service (DoS) on the affected system.
내용
The fix assigns rsp_len only after validating num_scid so error responses cannot read past the small on-stack pdu buffer. Red Hat concurs with upstream that this is primarily a remote-triggerable crash against the Bluetooth stack. Patch kernels promptly.
완화 방법
To mitigate this issue, prevent the bluetooth module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.
CVSS (Common Vulnerability Scoring System) 점수 세부 사항
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
다음의 CVSS 지표 및 점수는 예비 정보로 검토 대상입니다.
CVSS v3 점수 분석
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| 기본 점수 | 6.1 | N/A | 8.1 |
| 공격 벡터 | Local | N/A | Adjacent Network |
| 공격 복잡성 | Low | N/A | Low |
| 필요한 권한 | Low | N/A | None |
| 사용자 상호 작용 | None | N/A | None |
| 범위 | Unchanged | N/A | Unchanged |
| 기밀성 | Low | N/A | High |
| 무결성에 미치는 영향 | None | N/A | None |
| 가용성에 미치는 영향 | High | N/A | High |
벡터
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
cve.org: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
취약점 이해 (CWE)
Confidentiality
Technical Impact: Read Memory
An attacker could get secret values such as cryptographic keys, PII, memory addresses, or other information that could be used in additional attacks.
Confidentiality
Technical Impact: Bypass Protection Mechanism
Out-of-bounds memory could contain memory addresses or other information that can be used to bypass ASLR and other protection mechanisms in order to improve the reliability of exploiting a separate weakness for code execution.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker could cause a segmentation fault or crash by causing memory to be read outside of the bounds of the buffer. This is especially likely when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string.
Other
Technical Impact: Varies by Context
The read operation could produce other undefined or unexpected results.
