Bug 1227780 (CVE-2024-40931) - VUL-0: CVE-2024-40931: kernel: mptcp: ensure snd_una is properly initialized on connect
Summary: VUL-0: CVE-2024-40931: kernel: mptcp: ensure snd_una is properly initialized ...
Status: NEW
Alias: CVE-2024-40931
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P3 - Medium : Normal
Target Milestone: ---
Assignee: Security Team bot
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/413858/
Whiteboard: CVSSv3.1:SUSE:CVE-2024-40931:5.3:(AV:...
Keywords:
Depends on:
Blocks:
 
Reported: 2024-07-15 11:14 UTC by SMASH SMASH
Modified: 2024-07-19 12:10 UTC (History)
6 users (show)

See Also:
Found By: Security Response Team
Services Priority:
Business Priority:
Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

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Description SMASH SMASH 2024-07-15 11:14:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mptcp: ensure snd_una is properly initialized on connect

This is strictly related to commit fb7a0d334894 ("mptcp: ensure snd_nxt
is properly initialized on connect"). It turns out that syzkaller can
trigger the retransmit after fallback and before processing any other
incoming packet - so that snd_una is still left uninitialized.

Address the issue explicitly initializing snd_una together with snd_nxt
and write_seq.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-40931
https://www.cve.org/CVERecord?id=CVE-2024-40931
https://git.kernel.org/stable/c/208cd22ef5e57f82d38ec11c1a1703f9401d6dde
https://git.kernel.org/stable/c/7b9c7fc8600b64a86e4b47b2d190bba380267726
https://git.kernel.org/stable/c/8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3
https://git.kernel.org/stable/c/ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce
https://git.kernel.org/stable/c/f03c46eabb3a67bd2993e237ab5517f00a5f1813
https://git.kernel.org/stable/c/f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-40931.mbox