CVE-2022-49297

published 2025-02-26

CVE-2022-49297: In the Linux kernel, the following vulnerability has been resolved: nbd: fix io hung while disconnecting device In our tests, "qemu-nbd" triggers a io hung…

Priority P4 21 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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

nbd: fix io hung while disconnecting device

In our tests, "qemu-nbd" triggers a io hung:

INFO: task qemu-nbd:11445 blocked for more than 368 seconds.
Not tainted 5.18.0-rc3-next-20220422-00003-g2176915513ca #884
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:qemu-nbd state:D stack: 0 pid:11445 ppid: 1 flags:0x00000000
Call Trace:

__schedule+0x480/0x1050
? _raw_spin_lock_irqsave+0x3e/0xb0
schedule+0x9c/0x1b0
blk_mq_freeze_queue_wait+0x9d/0xf0
? ipi_rseq+0x70/0x70
blk_mq_freeze_queue+0x2b/0x40
nbd_add_socket+0x6b/0x270 [nbd]
nbd_ioctl+0x383/0x510 [nbd]
blkdev_ioctl+0x18e/0x3e0
__x64_sys_ioctl+0xac/0x120
do_syscall_64+0x35/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fd8ff706577
RSP: 002b:00007fd8fcdfebf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000040000000 RCX: 00007fd8ff706577
RDX: 000000000000000d RSI: 000000000000ab00 RDI: 000000000000000f
RBP: 000000000000000f R08: 000000000000fbe8 R09: 000055fe497c62b0
R10: 00000002aff20000 R11: 0000000000000246 R12: 000000000000006d
R13: 0000000000000000 R14: 00007ffe82dc5e70 R15: 00007fd8fcdff9c0

"qemu-ndb -d" will call ioctl 'NBD_DISCONNECT' first, however, following
message was found:

block nbd0: Send disconnect failed -32

Which indicate that something is wrong with the server. Then,
"qemu-nbd -d" will call ioctl 'NBD_CLEAR_SOCK', however ioctl can't clear
requests after commit 2516ab1543fd("nbd: only clear the queue on device
teardown"). And in the meantime, request can't complete through timeout
because nbd_xmit_timeout() will always return 'BLK_EH_RESET_TIMER', which
means such request will never be completed in this situation.

Now that the flag 'NBD_CMD_INFLIGHT' can make sure requests won't
complete multiple times, switch back to call nbd_clear_sock() in
nbd_clear_sock_ioctl(), so that inflight requests can be cleared.

Affected

21 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.18.5-1 (bookworm)	linux 5.18.5-1 (bookworm)
linux	linux	—	—
linux	linux	>= 2516ab1543fdd1f9d08385d73cae51f668a9f3dc < 67e403136a0e1a55fef6a05f103a3979a39ad3fd	67e403136a0e1a55fef6a05f103a3979a39ad3fd
linux	linux	>= 2516ab1543fdd1f9d08385d73cae51f668a9f3dc < 62d227f67a8c25d5e16f40e5290607f9306d2188	62d227f67a8c25d5e16f40e5290607f9306d2188
linux	linux	>= 2516ab1543fdd1f9d08385d73cae51f668a9f3dc < 69893d6d7f5c10d8306c1b5fc64b71efc91aa6cd	69893d6d7f5c10d8306c1b5fc64b71efc91aa6cd
linux	linux	>= 2516ab1543fdd1f9d08385d73cae51f668a9f3dc < f72df77600a43e59b3189e53b47f8685739867d3	f72df77600a43e59b3189e53b47f8685739867d3
linux	linux	>= 2516ab1543fdd1f9d08385d73cae51f668a9f3dc < c4ba982bd5084fa659ef518aaf159e4dab02ecda	c4ba982bd5084fa659ef518aaf159e4dab02ecda
linux	linux	>= 2516ab1543fdd1f9d08385d73cae51f668a9f3dc < 54b06dc2a206b4d67349bb56b92d4bd32700b7b1	54b06dc2a206b4d67349bb56b92d4bd32700b7b1
linux	linux	>= 2516ab1543fdd1f9d08385d73cae51f668a9f3dc < 141318e62db87105b0103fccc59c9c5940da248d	141318e62db87105b0103fccc59c9c5940da248d
linux	linux	>= 2516ab1543fdd1f9d08385d73cae51f668a9f3dc < 09dadb5985023e27d4740ebd17e6fea4640110e5	09dadb5985023e27d4740ebd17e6fea4640110e5
linux	linux_kernel	< 4.14.283	4.14.283
linux	linux_kernel	>= 0 < 5.10.127-1	5.10.127-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 4.15 < 4.19.247	4.19.247
linux	linux_kernel	>= 4.20 < 5.4.198	5.4.198
linux	linux_kernel	>= 5.11 < 5.15.47	5.15.47
linux	linux_kernel	>= 5.16 < 5.17.15	5.17.15
linux	linux_kernel	>= 5.18 < 5.18.4	5.18.4
linux	linux_kernel	>= 5.5 < 5.10.122	5.10.122

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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