{"id":"CVE-2022-49297","state":"PUBLISHED","title":"nbd: fix io hung while disconnecting device","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix io hung while disconnecting device\n\nIn our tests, \"qemu-nbd\" triggers a io hung:\n\nINFO: task qemu-nbd:11445 blocked for more than 368 seconds.\n      Not tainted 5.18.0-rc3-next-20220422-00003-g2176915513ca #884\n\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:qemu-nbd        state:D stack:    0 pid:11445 ppid:     1 flags:0x00000000\nCall Trace:\n <TASK>\n __schedule+0x480/0x1050\n ? _raw_spin_lock_irqsave+0x3e/0xb0\n schedule+0x9c/0x1b0\n blk_mq_freeze_queue_wait+0x9d/0xf0\n ? ipi_rseq+0x70/0x70\n blk_mq_freeze_queue+0x2b/0x40\n nbd_add_socket+0x6b/0x270 [nbd]\n nbd_ioctl+0x383/0x510 [nbd]\n blkdev_ioctl+0x18e/0x3e0\n __x64_sys_ioctl+0xac/0x120\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7fd8ff706577\nRSP: 002b:00007fd8fcdfebf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 0000000040000000 RCX: 00007fd8ff706577\nRDX: 000000000000000d RSI: 000000000000ab00 RDI: 000000000000000f\nRBP: 000000000000000f R08: 000000000000fbe8 R09: 000055fe497c62b0\nR10: 00000002aff20000 R11: 0000000000000246 R12: 000000000000006d\nR13: 0000000000000000 R14: 00007ffe82dc5e70 R15: 00007fd8fcdff9c0\n\n\"qemu-ndb -d\" will call ioctl 'NBD_DISCONNECT' first, however, following\nmessage was found:\n\nblock nbd0: Send disconnect failed -32\n\nWhich indicate that something is wrong with the server. Then,\n\"qemu-nbd -d\" will call ioctl 'NBD_CLEAR_SOCK', however ioctl can't clear\nrequests after commit 2516ab1543fd(\"nbd: only clear the queue on device\nteardown\"). And in the meantime, request can't complete through timeout\nbecause nbd_xmit_timeout() will always return 'BLK_EH_RESET_TIMER', which\nmeans such request will never be completed in this situation.\n\nNow that the flag 'NBD_CMD_INFLIGHT' can make sure requests won't\ncomplete multiple times, switch back to call nbd_clear_sock() in\nnbd_clear_sock_ioctl(), so that inflight requests can be cleared.","publishedAt":"2025-02-26T02:01:26.628Z","updatedAt":"2026-05-11T18:56:58.046Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"67e403136a0e1a55fef6a05f103a3979a39ad3fd","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"62d227f67a8c25d5e16f40e5290607f9306d2188","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"69893d6d7f5c10d8306c1b5fc64b71efc91aa6cd","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"f72df77600a43e59b3189e53b47f8685739867d3","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"c4ba982bd5084fa659ef518aaf159e4dab02ecda","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"54b06dc2a206b4d67349bb56b92d4bd32700b7b1","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"141318e62db87105b0103fccc59c9c5940da248d","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"09dadb5985023e27d4740ebd17e6fea4640110e5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.12","versionType":"semver"},{"version":"4.14.283","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.247","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.198","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.122","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.47","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.17.15","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18.4","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]}],"references":["https://git.kernel.org/stable/c/67e403136a0e1a55fef6a05f103a3979a39ad3fd","https://git.kernel.org/stable/c/62d227f67a8c25d5e16f40e5290607f9306d2188","https://git.kernel.org/stable/c/69893d6d7f5c10d8306c1b5fc64b71efc91aa6cd","https://git.kernel.org/stable/c/f72df77600a43e59b3189e53b47f8685739867d3","https://git.kernel.org/stable/c/c4ba982bd5084fa659ef518aaf159e4dab02ecda","https://git.kernel.org/stable/c/54b06dc2a206b4d67349bb56b92d4bd32700b7b1","https://git.kernel.org/stable/c/141318e62db87105b0103fccc59c9c5940da248d","https://git.kernel.org/stable/c/09dadb5985023e27d4740ebd17e6fea4640110e5"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49297.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49297","state":"PUBLISHED","datePublished":"2025-02-26T02:01:26.628Z","dateUpdated":"2026-05-11T18:56:58.046Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T01:49:39.302Z"},"containers":{"cna":{"title":"nbd: fix io hung while disconnecting device","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix io hung while disconnecting device\n\nIn our tests, \"qemu-nbd\" triggers a io hung:\n\nINFO: task qemu-nbd:11445 blocked for more than 368 seconds.\n      Not tainted 5.18.0-rc3-next-20220422-00003-g2176915513ca #884\n\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:qemu-nbd        state:D stack:    0 pid:11445 ppid:     1 flags:0x00000000\nCall Trace:\n <TASK>\n __schedule+0x480/0x1050\n ? _raw_spin_lock_irqsave+0x3e/0xb0\n schedule+0x9c/0x1b0\n blk_mq_freeze_queue_wait+0x9d/0xf0\n ? ipi_rseq+0x70/0x70\n blk_mq_freeze_queue+0x2b/0x40\n nbd_add_socket+0x6b/0x270 [nbd]\n nbd_ioctl+0x383/0x510 [nbd]\n blkdev_ioctl+0x18e/0x3e0\n __x64_sys_ioctl+0xac/0x120\n do_syscall_64+0x35/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7fd8ff706577\nRSP: 002b:00007fd8fcdfebf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 0000000040000000 RCX: 00007fd8ff706577\nRDX: 000000000000000d RSI: 000000000000ab00 RDI: 000000000000000f\nRBP: 000000000000000f R08: 000000000000fbe8 R09: 000055fe497c62b0\nR10: 00000002aff20000 R11: 0000000000000246 R12: 000000000000006d\nR13: 0000000000000000 R14: 00007ffe82dc5e70 R15: 00007fd8fcdff9c0\n\n\"qemu-ndb -d\" will call ioctl 'NBD_DISCONNECT' first, however, following\nmessage was found:\n\nblock nbd0: Send disconnect failed -32\n\nWhich indicate that something is wrong with the server. Then,\n\"qemu-nbd -d\" will call ioctl 'NBD_CLEAR_SOCK', however ioctl can't clear\nrequests after commit 2516ab1543fd(\"nbd: only clear the queue on device\nteardown\"). And in the meantime, request can't complete through timeout\nbecause nbd_xmit_timeout() will always return 'BLK_EH_RESET_TIMER', which\nmeans such request will never be completed in this situation.\n\nNow that the flag 'NBD_CMD_INFLIGHT' can make sure requests won't\ncomplete multiple times, switch back to call nbd_clear_sock() in\nnbd_clear_sock_ioctl(), so that inflight requests can be cleared."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"67e403136a0e1a55fef6a05f103a3979a39ad3fd","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"62d227f67a8c25d5e16f40e5290607f9306d2188","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"69893d6d7f5c10d8306c1b5fc64b71efc91aa6cd","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"f72df77600a43e59b3189e53b47f8685739867d3","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"c4ba982bd5084fa659ef518aaf159e4dab02ecda","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"54b06dc2a206b4d67349bb56b92d4bd32700b7b1","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"141318e62db87105b0103fccc59c9c5940da248d","versionType":"git"},{"version":"2516ab1543fdd1f9d08385d73cae51f668a9f3dc","status":"affected","lessThan":"09dadb5985023e27d4740ebd17e6fea4640110e5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.12","versionType":"semver"},{"version":"4.14.283","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.247","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.198","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.122","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.47","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.17.15","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18.4","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/67e403136a0e1a55fef6a05f103a3979a39ad3fd"},{"url":"https://git.kernel.org/stable/c/62d227f67a8c25d5e16f40e5290607f9306d2188"},{"url":"https://git.kernel.org/stable/c/69893d6d7f5c10d8306c1b5fc64b71efc91aa6cd"},{"url":"https://git.kernel.org/stable/c/f72df77600a43e59b3189e53b47f8685739867d3"},{"url":"https://git.kernel.org/stable/c/c4ba982bd5084fa659ef518aaf159e4dab02ecda"},{"url":"https://git.kernel.org/stable/c/54b06dc2a206b4d67349bb56b92d4bd32700b7b1"},{"url":"https://git.kernel.org/stable/c/141318e62db87105b0103fccc59c9c5940da248d"},{"url":"https://git.kernel.org/stable/c/09dadb5985023e27d4740ebd17e6fea4640110e5"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T18:56:58.046Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"4.14.283"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"4.19.247"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.4.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.10.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.15.47"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.17.15"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.18.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"5.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}