ACPICA：恢复“ACPICA：避免信息：映射多个 BAR。您的内核没有问题。”（CVE-2024-40984）
CVE编号
CVE-2024-40984利用情况
暂无补丁情况
N/A披露时间
2024-07-12漏洞描述
In the Linux kernel, the following vulnerability has been resolved: ACPICA: Revert "ACPICA: avoid Info: mapping multiple BARs. Your kernel is fine." Undo the modifications made in commit d410ee5109a1 ("ACPICA: avoid "Info: mapping multiple BARs. Your kernel is fine.""). The initial purpose of this commit was to stop memory mappings for operation regions from overlapping page boundaries, as it can trigger warnings if different page attributes are present. However, it was found that when this situation arises, mapping continues until the boundary's end, but there is still an attempt to read/write the entire length of the map, leading to a NULL pointer deference. For example, if a four-byte mapping request is made but only one byte is mapped because it hits the current page boundary's end, a four-byte read/write attempt is still made, resulting in a NULL pointer deference. Instead, map the entire length, as the ACPI specification does not mandate that it must be within the same page boundary. It is permissible for it to be mapped across different regions.解决建议
建议您更新当前系统或软件至最新版，完成漏洞的修复。- 攻击路径 N/A
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- 完整性 N/A
| CWE-ID | 漏洞类型 |
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