跳转到帖子

Debian: CVE-2023-52501: linux -- security update

recommended_posts

发布于
  • Members

Debian: CVE-2023-52501: linux -- security update

Severity
6
CVSS
(AV:L/AC:L/Au:S/C:C/I:N/A:C)
Published
03/02/2024
Created
07/31/2024
Added
07/30/2024
Modified
01/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Do not attempt to read past "commit" When iterating over the ring buffer while the ring buffer is active, the writer can corrupt the reader. There's barriers to help detect this and handle it, but that code missed the case where the last event was at the very end of the page and has only 4 bytes left. The checks to detect the corruption by the writer to reads needs to see the length of the event. If the length in the first 4 bytes is zero then the length is stored in the second 4 bytes. But if the writer is in the process of updating that code, there's a small window where the length in the first 4 bytes could be zero even though the length is only 4 bytes. That will cause rb_event_length() to read the next 4 bytes which could happen to be off the allocated page. To protect against this, fail immediately if the next event pointer is less than 8 bytes from the end of the commit (last byte of data), as all events must be a minimum of 8 bytes anyway.

Solution(s)

  • debian-upgrade-linux

References

  • https://attackerkb.com/topics/cve-2023-52501
  • CVE - 2023-52501
  • 查看数 707
  • 已创建
  • 最后回复

参与讨论

你可立刻发布并稍后注册。 如果你有帐户,立刻登录发布帖子。
注意:你的帖子需要版主批准后才能看到。

游客
回帖…