Bug 2221501 (CVE-2023-3106) - CVE-2023-3106 kernel: Netlink socket crash (null pointer deref) in netlink_dump function
Summary: CVE-2023-3106 kernel: Netlink socket crash (null pointer deref) in netlink_du...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2023-3106
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 2221502 2221503 2222176
Blocks: 2211870
TreeView+ depends on / blocked
 
Reported: 2023-07-09 14:55 UTC by Alex
Modified: 2023-09-22 19:17 UTC (History)
47 users (show)

Fixed In Version: kernel 4.8-rc7
Doc Type: If docs needed, set a value
Doc Text:
A NULL pointer dereference vulnerability was found in netlink_dump. This issue can occur when the Netlink socket receives the message(sendmsg) for the XFRM_MSG_GETSA, XFRM_MSG_GETPOLICY type message, and the DUMP flag is set and can cause a denial of service or possibly another unspecified impact. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although it is unlikely.
Clone Of:
Environment:
Last Closed: 2023-07-12 11:39:41 UTC
Embargoed:

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Description Alex 2023-07-09 14:55:38 UTC 
A flaw in the Linux Kernel found in netlink_dump. When the Netlink socket receives the message(sendmsg), for the XFRM_MSG_GETSA, XFRM_MSG_GETPOLICY type message and the DUMP flag is set, it will enter the netlink_dump function for processing. When sending data to the socket multiple times, it will make sk->sk_rmem_alloc continues to accumulate, and eventually atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf will be judged as True, skipping the initialization of netlink_callback->args.

Reference:
https://github.com/torvalds/linux/commit/1ba5bf993c6a3142e18e68ea6452b347f9cb5635
Comment 4 Alex 2023-07-12 07:04:02 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2222176]
Comment 6 Product Security DevOps Team 2023-07-12 11:39:38 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-2023-3106
Comment 7 Justin M. Forbes 2023-07-18 18:33:34 UTC 
This was fixed for Fedora with 4.8 kernel updates in 2016.
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