# CVE-2022-48906: linux: In the Linux kernel, the following vulnerability has been resolved:  mptcp: Correctly set DATA_FIN timeout when numbe...

CVE-2022-48906 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48906, released August 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48906
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 22, 2024

## Description

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 DATA_FIN retransmits caused a shift-out-of-bounds in the DATA_FIN 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 mptcp_worker Call Trace:  <TASK>  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106  ubsan_epilogue+0xb/0x5a lib/ubsan.c:151  __ubsan_handle_shift_out_of_bounds.cold+0xb2/0x20e lib/ubsan.c:330  mptcp_set_datafin_timeout net/mptcp/protocol.c:470 [inline]  __mptcp_retrans.cold+0x72/0x77 net/mptcp/protocol.c:2445  mptcp_worker+0x58a/0xa70 net/mptcp/protocol.c:2528  process_one_work+0x9df/0x16d0 kernel/workqueue.c:2307  worker_thread+0x95/0xe10 kernel/workqueue.c:2454  kthread+0x2f4/0x3b0 kernel/kthread.c:377  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295  </TASK> ================================================================================  This change limits the maximum timeout by limiting the size of the shift, which keeps all intermediate values in-bounds.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.14-1 | [DEBIAN-CVE-2022-48906](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48906.md) | Aug 22, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.14-1 | [DEBIAN-CVE-2022-48906](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48906.md) | Aug 22, 2024 |
| Linux | linux Debian 14 | 5.16.14-1 | [DEBIAN-CVE-2022-48906](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48906.md) | Aug 22, 2024 |

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