CVE-2020-29534

Severity

78%

Complexity

18%

Confidentiality

98%

An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.

CVSS 3.1 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 7.2. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:C/I:C/A:C).

Overview

First reported 4 years ago

2020-12-03 20:15:00

Last updated 4 years ago

2020-12-07 19:36:00

Affected Software

Linux Kernel

References

https://bugs.chromium.org/p/project-zero/issues/detail?id=2089

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9.3

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0f2122045b946241a9e549c2a76cea54fa58a7ff

https://bugs.chromium.org/p/project-zero/issues/detail?id=2089

Issue Tracking, Third Party Advisory

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9.3

Release Notes, Vendor Advisory

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0f2122045b946241a9e549c2a76cea54fa58a7ff

Patch, Vendor Advisory

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