CVE-2024-55916 (GCVE-0-2024-55916)

Vulnerability from cvelistv5 – Published: 2025-01-11 12:35 – Updated: 2025-11-03 20:48
VLAI?
Title
Drivers: hv: util: Avoid accessing a ringbuffer not initialized yet
Summary
In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: util: Avoid accessing a ringbuffer not initialized yet If the KVP (or VSS) daemon starts before the VMBus channel's ringbuffer is fully initialized, we can hit the panic below: hv_utils: Registering HyperV Utility Driver hv_vmbus: registering driver hv_utils ... BUG: kernel NULL pointer dereference, address: 0000000000000000 CPU: 44 UID: 0 PID: 2552 Comm: hv_kvp_daemon Tainted: G E 6.11.0-rc3+ #1 RIP: 0010:hv_pkt_iter_first+0x12/0xd0 Call Trace: ... vmbus_recvpacket hv_kvp_onchannelcallback vmbus_on_event tasklet_action_common tasklet_action handle_softirqs irq_exit_rcu sysvec_hyperv_stimer0 </IRQ> <TASK> asm_sysvec_hyperv_stimer0 ... kvp_register_done hvt_op_read vfs_read ksys_read __x64_sys_read This can happen because the KVP/VSS channel callback can be invoked even before the channel is fully opened: 1) as soon as hv_kvp_init() -> hvutil_transport_init() creates /dev/vmbus/hv_kvp, the kvp daemon can open the device file immediately and register itself to the driver by writing a message KVP_OP_REGISTER1 to the file (which is handled by kvp_on_msg() ->kvp_handle_handshake()) and reading the file for the driver's response, which is handled by hvt_op_read(), which calls hvt->on_read(), i.e. kvp_register_done(). 2) the problem with kvp_register_done() is that it can cause the channel callback to be called even before the channel is fully opened, and when the channel callback is starting to run, util_probe()-> vmbus_open() may have not initialized the ringbuffer yet, so the callback can hit the panic of NULL pointer dereference. To reproduce the panic consistently, we can add a "ssleep(10)" for KVP in __vmbus_open(), just before the first hv_ringbuffer_init(), and then we unload and reload the driver hv_utils, and run the daemon manually within the 10 seconds. Fix the panic by reordering the steps in util_probe() so the char dev entry used by the KVP or VSS daemon is not created until after vmbus_open() has completed. This reordering prevents the race condition from happening.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c , < f091a224a2c82f1e302b1768d73bb6332f687321 (git)
Affected: e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c , < d81f4e73aff9b861671df60e5100ad25cc16fbf8 (git)
Affected: e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c , < 042253c57be901bfd19f15b68267442b70f510d5 (git)
Affected: e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c , < 718fe694a334be9d1a89eed22602369ac18d6583 (git)
Affected: e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c , < 89fcec5e466b3ac9b376e0d621c71effa1a7983f (git)
Affected: e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c , < 3dd7a30c6d7f90afcf19e9b072f572ba524d7ec6 (git)
Affected: e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c , < 07a756a49f4b4290b49ea46e089cbe6f79ff8d26 (git)
Create a notification for this product.
    Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 5.4.289 , ≤ 5.4.* (semver)
Unaffected: 5.10.233 , ≤ 5.10.* (semver)
Unaffected: 5.15.176 , ≤ 5.15.* (semver)
Unaffected: 6.1.122 , ≤ 6.1.* (semver)
Unaffected: 6.6.68 , ≤ 6.6.* (semver)
Unaffected: 6.12.7 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nDrivers: hv: util: Avoid accessing a ringbuffer not initialized yet\n\nIf the KVP (or VSS) daemon starts before the VMBus channel\u0027s ringbuffer is\nfully initialized, we can hit the panic below:\n\nhv_utils: Registering HyperV Utility Driver\nhv_vmbus: registering driver hv_utils\n...\nBUG: kernel NULL pointer dereference, address: 0000000000000000\nCPU: 44 UID: 0 PID: 2552 Comm: hv_kvp_daemon Tainted: G E 6.11.0-rc3+ #1\nRIP: 0010:hv_pkt_iter_first+0x12/0xd0\nCall Trace:\n...\n vmbus_recvpacket\n hv_kvp_onchannelcallback\n vmbus_on_event\n tasklet_action_common\n tasklet_action\n handle_softirqs\n irq_exit_rcu\n sysvec_hyperv_stimer0\n \u003c/IRQ\u003e\n \u003cTASK\u003e\n asm_sysvec_hyperv_stimer0\n...\n kvp_register_done\n hvt_op_read\n vfs_read\n ksys_read\n __x64_sys_read\n\nThis can happen because the KVP/VSS channel callback can be invoked\neven before the channel is fully opened:\n1) as soon as hv_kvp_init() -\u003e hvutil_transport_init() creates\n/dev/vmbus/hv_kvp, the kvp daemon can open the device file immediately and\nregister itself to the driver by writing a message KVP_OP_REGISTER1 to the\nfile (which is handled by kvp_on_msg() -\u003ekvp_handle_handshake()) and\nreading the file for the driver\u0027s response, which is handled by\nhvt_op_read(), which calls hvt-\u003eon_read(), i.e. kvp_register_done().\n\n2) the problem with kvp_register_done() is that it can cause the\nchannel callback to be called even before the channel is fully opened,\nand when the channel callback is starting to run, util_probe()-\u003e\nvmbus_open() may have not initialized the ringbuffer yet, so the\ncallback can hit the panic of NULL pointer dereference.\n\nTo reproduce the panic consistently, we can add a \"ssleep(10)\" for KVP in\n__vmbus_open(), just before the first hv_ringbuffer_init(), and then we\nunload and reload the driver hv_utils, and run the daemon manually within\nthe 10 seconds.\n\nFix the panic by reordering the steps in util_probe() so the char dev\nentry used by the KVP or VSS daemon is not created until after\nvmbus_open() has completed. This reordering prevents the race condition\nfrom happening."
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\"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/hv/hv_kvp.c\", \"drivers/hv/hv_snapshot.c\", \"drivers/hv/hv_util.c\", \"drivers/hv/hyperv_vmbus.h\", \"include/linux/hyperv.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f091a224a2c82f1e302b1768d73bb6332f687321\"}, {\"url\": \"https://git.kernel.org/stable/c/d81f4e73aff9b861671df60e5100ad25cc16fbf8\"}, {\"url\": \"https://git.kernel.org/stable/c/042253c57be901bfd19f15b68267442b70f510d5\"}, {\"url\": \"https://git.kernel.org/stable/c/718fe694a334be9d1a89eed22602369ac18d6583\"}, {\"url\": \"https://git.kernel.org/stable/c/89fcec5e466b3ac9b376e0d621c71effa1a7983f\"}, {\"url\": \"https://git.kernel.org/stable/c/3dd7a30c6d7f90afcf19e9b072f572ba524d7ec6\"}, {\"url\": \"https://git.kernel.org/stable/c/07a756a49f4b4290b49ea46e089cbe6f79ff8d26\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nDrivers: hv: util: Avoid accessing a ringbuffer not initialized yet\\n\\nIf the KVP (or VSS) daemon starts before the VMBus channel\u0027s ringbuffer is\\nfully initialized, we can hit the panic below:\\n\\nhv_utils: Registering HyperV Utility Driver\\nhv_vmbus: registering driver hv_utils\\n...\\nBUG: kernel NULL pointer dereference, address: 0000000000000000\\nCPU: 44 UID: 0 PID: 2552 Comm: hv_kvp_daemon Tainted: G E 6.11.0-rc3+ #1\\nRIP: 0010:hv_pkt_iter_first+0x12/0xd0\\nCall Trace:\\n...\\n vmbus_recvpacket\\n hv_kvp_onchannelcallback\\n vmbus_on_event\\n tasklet_action_common\\n tasklet_action\\n handle_softirqs\\n irq_exit_rcu\\n sysvec_hyperv_stimer0\\n \u003c/IRQ\u003e\\n \u003cTASK\u003e\\n asm_sysvec_hyperv_stimer0\\n...\\n kvp_register_done\\n hvt_op_read\\n vfs_read\\n ksys_read\\n __x64_sys_read\\n\\nThis can happen because the KVP/VSS channel callback can be invoked\\neven before the channel is fully opened:\\n1) as soon as hv_kvp_init() -\u003e hvutil_transport_init() creates\\n/dev/vmbus/hv_kvp, the kvp daemon can open the device file immediately and\\nregister itself to the driver by writing a message KVP_OP_REGISTER1 to the\\nfile (which is handled by kvp_on_msg() -\u003ekvp_handle_handshake()) and\\nreading the file for the driver\u0027s response, which is handled by\\nhvt_op_read(), which calls hvt-\u003eon_read(), i.e. kvp_register_done().\\n\\n2) the problem with kvp_register_done() is that it can cause the\\nchannel callback to be called even before the channel is fully opened,\\nand when the channel callback is starting to run, util_probe()-\u003e\\nvmbus_open() may have not initialized the ringbuffer yet, so the\\ncallback can hit the panic of NULL pointer dereference.\\n\\nTo reproduce the panic consistently, we can add a \\\"ssleep(10)\\\" for KVP in\\n__vmbus_open(), just before the first hv_ringbuffer_init(), and then we\\nunload and reload the driver hv_utils, and run the daemon manually within\\nthe 10 seconds.\\n\\nFix the panic by reordering the steps in util_probe() so the char dev\\nentry used by the KVP or VSS daemon is not created until after\\nvmbus_open() has completed. This reordering prevents the race condition\\nfrom happening.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.289\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.233\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.176\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.122\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.68\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.7\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"4.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:57:19.361Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-55916\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T20:48:52.286Z\", \"dateReserved\": \"2025-01-09T09:49:29.678Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-01-11T12:35:44.800Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.