Bug 2196759 (CVE-2023-2236) - CVE-2023-2236 kernel: use-after-free in io_uring/filetable in io_install_fixed_file
Summary: CVE-2023-2236 kernel: use-after-free in io_uring/filetable in io_install_fixe...
Keywords:
Status: NEW
Alias: CVE-2023-2236
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 2068237 2210986 2210987
Blocks: 2192393
TreeView+ depends on / blocked
 
Reported: 2023-05-10 06:58 UTC by Rohit Keshri
Modified: 2023-11-01 15:57 UTC (History)
44 users (show)

Fixed In Version: Kernel 6.1-rc7
Doc Type: If docs needed, set a value
Doc Text:
A use-after-free vulnerability was found in io_install_fixed_file in io_uring/filetable.c in the Linux Kernel’s io_uring subsystem. This flaw allows an attacker to achieve local privilege escalation.
Clone Of:
Environment:
Last Closed: 2023-05-31 19:15:58 UTC
Embargoed:

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Description Rohit Keshri 2023-05-10 06:58:12 UTC 
A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation.

Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability.

We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.

https://kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4
Comment 2 Rohit Keshri 2023-05-10 07:29:05 UTC 
There was no shipped kernel version were seen affected with this problem. These files are not built in our source code.
Comment 5 Product Security DevOps Team 2023-05-10 12:44:23 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2023-2236
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