CVE-2022-48906

Source
https://nvd.nist.gov/vuln/detail/CVE-2022-48906
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48906.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2022-48906
Related
Published
2024-08-22T02:15:05Z
Modified
2024-09-18T01:00:21Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

mptcp: Correctly set DATA_FIN timeout when number of retransmits is large

Syzkaller with UBSAN uncovered a scenario where a large number of DATAFIN retransmits caused a shift-out-of-bounds in the DATAFIN timeout calculation:

================================================================================ UBSAN: shift-out-of-bounds in net/mptcp/protocol.c:470:29 shift exponent 32 is too large for 32-bit type 'unsigned int' CPU: 1 PID: 13059 Comm: kworker/1:0 Not tainted 5.17.0-rc2-00630-g5fbf21c90c60 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: events mptcpworker Call Trace: <TASK> _dumpstack lib/dumpstack.c:88 [inline] dumpstacklvl+0xcd/0x134 lib/dumpstack.c:106 ubsanepilogue+0xb/0x5a lib/ubsan.c:151 _ubsanhandleshiftoutofbounds.cold+0xb2/0x20e lib/ubsan.c:330 mptcpsetdatafintimeout net/mptcp/protocol.c:470 [inline] _mptcpretrans.cold+0x72/0x77 net/mptcp/protocol.c:2445 mptcpworker+0x58a/0xa70 net/mptcp/protocol.c:2528 processonework+0x9df/0x16d0 kernel/workqueue.c:2307 workerthread+0x95/0xe10 kernel/workqueue.c:2454 kthread+0x2f4/0x3b0 kernel/kthread.c:377 retfromfork+0x1f/0x30 arch/x86/entry/entry64.S:295

</TASK>

This change limits the maximum timeout by limiting the size of the shift, which keeps all intermediate values in-bounds.

References

Affected packages

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.16.14-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.16.14-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}