Bug 2237760 (CVE-2023-4622) - CVE-2023-4622 kernel: use after free in unix_stream_sendpage [NEEDINFO]
Summary: CVE-2023-4622 kernel: use after free in unix_stream_sendpage
Keywords:
Status: NEW
Alias: CVE-2023-4622
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
: 2230094 (view as bug list)
Depends On: 2233137 2233138 2233139 2233140 2233141 2233142 2233143 2233144 2233145 2233146 2233147 2233148 2233150 2233151 2233153 2233154 2233156 2233157 2233163 2237936 2237937
Blocks: 2230092 2237762
TreeView+ depends on / blocked
 
Reported: 2023-09-06 18:17 UTC by juneau
Modified: 2023-11-30 10:35 UTC (History)
46 users (show)

Fixed In Version: Kernel 6.4.12
Doc Type: If docs needed, set a value
Doc Text:
A use-after-free flaw was found in the Linux kernel's af_unix component that allows local privilege escalation. The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. This issue leads to a race condition where the unix_stream_sendpage() function could access a skb that is being released by garbage collection, resulting in a use-after-free issue.
Clone Of:
Environment:
Last Closed:
Embargoed:
joe.lawrence: needinfo? (allarkin)

Attachments (Terms of Use)

Description juneau 2023-09-06 18:17:18 UTC 
A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation.

The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free.

We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c.

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.1.y&id=790c2f9d15b594350ae9bca7b236f2b1859de02c
https://kernel.dance/790c2f9d15b594350ae9bca7b236f2b1859de02c
Comment 1 Rohit Keshri 2023-09-07 19:37:03 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2237936]
Comment 2 Rohit Keshri 2023-09-07 19:37:15 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2237937]
Comment 7 Justin M. Forbes 2023-09-08 16:31:19 UTC 
This was fixed for Fedora with the 6.4.12 stable kernel updates.
Comment 8 Alex 2023-10-12 15:07:07 UTC 
*** Bug 2230094 has been marked as a duplicate of this bug. ***
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