[ASA-202102-23] linux: arbitrary code execution

[Morten Linderud]

Arch Linux Security Advisory ASA-202102-23
==========================================

Severity: Medium
Date    : 2021-02-12
CVE-ID  : CVE-2021-3347
Package : linux
Type    : arbitrary code execution
Remote  : No
Link    : https://security.archlinux.org/AVG-1506

Summary
=======

The package linux before version 5.10.12.arch1-1 is vulnerable to
arbitrary code execution.

Resolution
==========

Upgrade to 5.10.12.arch1-1.

# pacman -Syu "linux>=5.10.12.arch1-1"

The problem has been fixed upstream in version 5.10.12.arch1.

Workaround
==========

None.

Description
===========

An issue was discovered in the Linux kernel through 5.10.11. PI futexes
have a kernel stack use-after-free during fault handling, allowing
local users to execute code in the kernel, aka CID-34b1a1ce1458.

Impact
======

An attacker can escalate privileges on the system by abusing io_uring
descriptor initialization.

References
==========

https://www.openwall.com/lists/oss-security/2021/01/29/1
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=12bb3f7f1b03d5913b3f9d4236a488aa7774dfe9
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=04b79c55201f02ffd675e1231d731365e335c307
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c5cade200ab9a2a3be9e7f32a752c8d86b502ec7
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2156ac1934166d6deb6cd0f6ffc4c1076ec63697
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6ccc84f917d33312eb2846bd7b567639f585ad6d
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2dac39d93987f7de1e20b3988c8685523247ae2
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=34b1a1ce1458f50ef27c54e28eb9b1947012907a
https://security.archlinux.org/CVE-2021-3347
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