| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "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's 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 </IRQ>\n <TASK>\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() -> 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() ->kvp_handle_handshake()) and\nreading the file for the driver's response, which is handled by\nhvt_op_read(), which calls hvt->on_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()->\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." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "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" |
| ], |
| "versions": [ |
| { |
| "version": "e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c", |
| "lessThan": "f091a224a2c82f1e302b1768d73bb6332f687321", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c", |
| "lessThan": "d81f4e73aff9b861671df60e5100ad25cc16fbf8", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c", |
| "lessThan": "042253c57be901bfd19f15b68267442b70f510d5", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c", |
| "lessThan": "718fe694a334be9d1a89eed22602369ac18d6583", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c", |
| "lessThan": "89fcec5e466b3ac9b376e0d621c71effa1a7983f", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c", |
| "lessThan": "3dd7a30c6d7f90afcf19e9b072f572ba524d7ec6", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "e0fa3e5e7df61eb2c339c9f0067c202c0cdeec2c", |
| "lessThan": "07a756a49f4b4290b49ea46e089cbe6f79ff8d26", |
| "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/hv/hv_kvp.c", |
| "drivers/hv/hv_snapshot.c", |
| "drivers/hv/hv_util.c", |
| "drivers/hv/hyperv_vmbus.h", |
| "include/linux/hyperv.h" |
| ], |
| "versions": [ |
| { |
| "version": "4.9", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "4.9", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.289", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.233", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.176", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.1.122", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.68", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.12.7", |
| "lessThanOrEqual": "6.12.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.13", |
| "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": "4.9", |
| "versionEndExcluding": "5.4.289" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.9", |
| "versionEndExcluding": "5.10.233" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.9", |
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| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.9", |
| "versionEndExcluding": "6.1.122" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.9", |
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| }, |
| { |
| "vulnerable": true, |
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| "versionStartIncluding": "4.9", |
| "versionEndExcluding": "6.12.7" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.9", |
| "versionEndExcluding": "6.13" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "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" |
| } |
| ], |
| "title": "Drivers: hv: util: Avoid accessing a ringbuffer not initialized yet", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-55916", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
