# CVE-2022-49018: linux: In the Linux kernel, the following vulnerability has been resolved:  mptcp: fix sleep in atomic at close time  Matt r...

CVE-2022-49018 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49018, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49018
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  mptcp: fix sleep in atomic at close time  Matt reported a splat at msk close time:      BUG: sleeping function called from invalid context at net/mptcp/protocol.c:2877     in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 155, name: packetdrill     preempt_count: 201, expected: 0     RCU nest depth: 0, expected: 0     4 locks held by packetdrill/155:     #0: ffff888001536990 (&sb->s_type->i_mutex_key#6){+.+.}-{3:3}, at: __sock_release (net/socket.c:650)     #1: ffff88800b498130 (sk_lock-AF_INET){+.+.}-{0:0}, at: mptcp_close (net/mptcp/protocol.c:2973)     #2: ffff88800b49a130 (sk_lock-AF_INET/1){+.+.}-{0:0}, at: __mptcp_close_ssk (net/mptcp/protocol.c:2363)     #3: ffff88800b49a0b0 (slock-AF_INET){+...}-{2:2}, at: __lock_sock_fast (include/net/sock.h:1820)     Preemption disabled at:     0x0     CPU: 1 PID: 155 Comm: packetdrill Not tainted 6.1.0-rc5 #365     Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014     Call Trace:     <TASK>     dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4))     __might_resched.cold (kernel/sched/core.c:9891)     __mptcp_destroy_sock (include/linux/kernel.h:110)     __mptcp_close (net/mptcp/protocol.c:2959)     mptcp_subflow_queue_clean (include/net/sock.h:1777)     __mptcp_close_ssk (net/mptcp/protocol.c:2363)     mptcp_destroy_common (net/mptcp/protocol.c:3170)     mptcp_destroy (include/net/sock.h:1495)     __mptcp_destroy_sock (net/mptcp/protocol.c:2886)     __mptcp_close (net/mptcp/protocol.c:2959)     mptcp_close (net/mptcp/protocol.c:2974)     inet_release (net/ipv4/af_inet.c:432)     __sock_release (net/socket.c:651)     sock_close (net/socket.c:1367)     __fput (fs/file_table.c:320)     task_work_run (kernel/task_work.c:181 (discriminator 1))     exit_to_user_mode_prepare (include/linux/resume_user_mode.h:49)     syscall_exit_to_user_mode (kernel/entry/common.c:130)     do_syscall_64 (arch/x86/entry/common.c:87)     entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)  We can't call mptcp_close under the 'fast' socket lock variant, replace it with a sock_lock_nested() as the relevant code is already under the listening msk socket lock protection.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.12-1 | [DEBIAN-CVE-2022-49018](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49018.md) | Oct 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.0.12-1 | [DEBIAN-CVE-2022-49018](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49018.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.0.12-1 | [DEBIAN-CVE-2022-49018](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49018.md) | Oct 21, 2024 |

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