Date: Wed, 10 May 2023 01:14:34 +0200 From: Solar Designer <solar@...nwall.com> To: Tobias Holl <tobias@...ll.xyz> Cc: oss-security@...ts.openwall.com Subject: Re: Linux kernel io_uring out-of-bounds access to physical memory On Mon, May 08, 2023 at 04:01:59PM +0200, Tobias Holl wrote: > a bug in the fixed buffer registration code for io_uring > (io_sqe_buffer_register in io_uring/rsrc.c) allows out-of-bounds access > to physical memory beyond the end of the buffer. This can be used to > achieve full local privilege escalation. > > The vulnerable code landed in 6.3-rc1 with commit 57bebf807e2a > ("io_uring/rsrc: optimise registered huge pages"). > > A fix has been committed upstream for 6.4-rc1 in commit 776617db78c6 > ("io_uring/rsrc: check for nonconsecutive pages"). The fix has also > been staged for 6.3.2. > > CVE assignment for this issue is pending. This is now CVE-2023-2598. Alexander
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