{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49300","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-02-26T02:08:31.534Z","datePublished":"2025-02-26T02:10:35.594Z","dateUpdated":"2025-12-23T13:23:09.889Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-12-23T13:23:09.889Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix race between nbd_alloc_config() and module removal\n\nWhen nbd module is being removing, nbd_alloc_config() may be\ncalled concurrently by nbd_genl_connect(), although try_module_get()\nwill return false, but nbd_alloc_config() doesn't handle it.\n\nThe race may lead to the leak of nbd_config and its related\nresources (e.g, recv_workq) and oops in nbd_read_stat() due\nto the unload of nbd module as shown below:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000040\n  Oops: 0000 [#1] SMP PTI\n  CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n  Workqueue: knbd16-recv recv_work [nbd]\n  RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd]\n  Call Trace:\n   recv_work+0x3b/0xb0 [nbd]\n   process_one_work+0x1ed/0x390\n   worker_thread+0x4a/0x3d0\n   kthread+0x12a/0x150\n   ret_from_fork+0x22/0x30\n\nFixing it by checking the return value of try_module_get()\nin nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV),\nassign nbd->config only when nbd_alloc_config() succeeds to ensure\nthe value of nbd->config is binary (valid or NULL).\n\nAlso adding a debug message to check the reference counter\nof nbd_config during module removal."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"],"versions":[{"version":"5ea8d10802ec4c153a6e21eebaf412e2abd29736","lessThan":"165cf2e0019fa6cedc75b456490c41494c34abb4","status":"affected","versionType":"git"},{"version":"5ea8d10802ec4c153a6e21eebaf412e2abd29736","lessThan":"2573f2375b64280be977431701ed5d33b75b9ad0","status":"affected","versionType":"git"},{"version":"5ea8d10802ec4c153a6e21eebaf412e2abd29736","lessThan":"8a7da4ced236ce6637fe70f14ca18e718d4bf9e9","status":"affected","versionType":"git"},{"version":"5ea8d10802ec4c153a6e21eebaf412e2abd29736","lessThan":"122e4adaff2439f1cc18cc7e931980fa7560df5c","status":"affected","versionType":"git"},{"version":"5ea8d10802ec4c153a6e21eebaf412e2abd29736","lessThan":"71c142f910da44421213ade601bcbd23ceae19fa","status":"affected","versionType":"git"},{"version":"5ea8d10802ec4c153a6e21eebaf412e2abd29736","lessThan":"2888fa41985f93ed0a6837cfbb06bcbfd7fa2314","status":"affected","versionType":"git"},{"version":"5ea8d10802ec4c153a6e21eebaf412e2abd29736","lessThan":"d09525720dd5201756f698bee1076de9aefd4602","status":"affected","versionType":"git"},{"version":"5ea8d10802ec4c153a6e21eebaf412e2abd29736","lessThan":"c55b2b983b0fa012942c3eb16384b2b722caa810","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"],"versions":[{"version":"4.12","status":"affected"},{"version":"0","lessThan":"4.12","status":"unaffected","versionType":"semver"},{"version":"4.14.283","lessThanOrEqual":"4.14.*","status":"unaffected","versionType":"semver"},{"version":"4.19.247","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.198","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.122","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.47","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.17.15","lessThanOrEqual":"5.17.*","status":"unaffected","versionType":"semver"},{"version":"5.18.4","lessThanOrEqual":"5.18.*","status":"unaffected","versionType":"semver"},{"version":"5.19","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"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"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/165cf2e0019fa6cedc75b456490c41494c34abb4"},{"url":"https://git.kernel.org/stable/c/2573f2375b64280be977431701ed5d33b75b9ad0"},{"url":"https://git.kernel.org/stable/c/8a7da4ced236ce6637fe70f14ca18e718d4bf9e9"},{"url":"https://git.kernel.org/stable/c/122e4adaff2439f1cc18cc7e931980fa7560df5c"},{"url":"https://git.kernel.org/stable/c/71c142f910da44421213ade601bcbd23ceae19fa"},{"url":"https://git.kernel.org/stable/c/2888fa41985f93ed0a6837cfbb06bcbfd7fa2314"},{"url":"https://git.kernel.org/stable/c/d09525720dd5201756f698bee1076de9aefd4602"},{"url":"https://git.kernel.org/stable/c/c55b2b983b0fa012942c3eb16384b2b722caa810"}],"title":"nbd: fix race between nbd_alloc_config() and module removal","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":4.7,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2022-49300","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:44:48.211252Z"}}}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","cweId":"CWE-476","description":"CWE-476 NULL Pointer Dereference"}]}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-10-01T19:46:59.286Z"}}]}}