CVE - CVE-2022-49297

CVE-ID
CVE-2022-49297	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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: <TASK> __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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/09dadb5985023e27d4740ebd17e6fea4640110e5 URL:https://git.kernel.org/stable/c/09dadb5985023e27d4740ebd17e6fea4640110e5 MISC:https://git.kernel.org/stable/c/141318e62db87105b0103fccc59c9c5940da248d URL:https://git.kernel.org/stable/c/141318e62db87105b0103fccc59c9c5940da248d MISC:https://git.kernel.org/stable/c/54b06dc2a206b4d67349bb56b92d4bd32700b7b1 URL:https://git.kernel.org/stable/c/54b06dc2a206b4d67349bb56b92d4bd32700b7b1 MISC:https://git.kernel.org/stable/c/62d227f67a8c25d5e16f40e5290607f9306d2188 URL:https://git.kernel.org/stable/c/62d227f67a8c25d5e16f40e5290607f9306d2188 MISC:https://git.kernel.org/stable/c/67e403136a0e1a55fef6a05f103a3979a39ad3fd URL:https://git.kernel.org/stable/c/67e403136a0e1a55fef6a05f103a3979a39ad3fd MISC:https://git.kernel.org/stable/c/69893d6d7f5c10d8306c1b5fc64b71efc91aa6cd URL:https://git.kernel.org/stable/c/69893d6d7f5c10d8306c1b5fc64b71efc91aa6cd MISC:https://git.kernel.org/stable/c/c4ba982bd5084fa659ef518aaf159e4dab02ecda URL:https://git.kernel.org/stable/c/c4ba982bd5084fa659ef518aaf159e4dab02ecda MISC:https://git.kernel.org/stable/c/f72df77600a43e59b3189e53b47f8685739867d3 URL:https://git.kernel.org/stable/c/f72df77600a43e59b3189e53b47f8685739867d3
Assigning CNA
kernel.org
Date Record Created
20250226	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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