{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"MEDIUM" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/hwmon: Get rid of devm\n\nWhen both hwmon and hwmon drvdata (on which hwmon depends) are device\nmanaged resources, the expectation, on device unbind, is that hwmon will be\nreleased before drvdata. However, in i915 there are two separate code\npaths, which both release either drvdata or hwmon and either can be\nreleased before the other. These code paths (for device unbind) are as\nfollows (see also the bug referenced below):\n\nCall Trace:\nrelease_nodes+0x11/0x70\ndevres_release_group+0xb2/0x110\ncomponent_unbind_all+0x8d/0xa0\ncomponent_del+0xa5/0x140\nintel_pxp_tee_component_fini+0x29/0x40 [i915]\nintel_pxp_fini+0x33/0x80 [i915]\ni915_driver_remove+0x4c/0x120 [i915]\ni915_pci_remove+0x19/0x30 [i915]\npci_device_remove+0x32/0xa0\ndevice_release_driver_internal+0x19c/0x200\nunbind_store+0x9c/0xb0\n\nand\n\nCall Trace:\nrelease_nodes+0x11/0x70\ndevres_release_all+0x8a/0xc0\ndevice_unbind_cleanup+0x9/0x70\ndevice_release_driver_internal+0x1c1/0x200\nunbind_store+0x9c/0xb0\n\nThis means that in i915, if use devm, we cannot gurantee that hwmon will\nalways be released before drvdata. Which means that we have a uaf if hwmon\nsysfs is accessed when drvdata has been released but hwmon hasn't.\n\nThe only way out of this seems to be do get rid of devm_ and release/free\neverything explicitly during device unbind.\n\nv2: Change commit message and other minor code changes\nv3: Cleanup from i915_hwmon_register on error (Armin Wolf)\nv4: Eliminate potential static analyzer warning (Rodrigo)\n Eliminate fetch_and_zero (Jani)\nv5: Restore previous logic for ddat_gt->hwmon_dev error return (Andi)", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2024-39479" }, { "summary":"CVE-2024-39479 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2024/csaf-openeuler-cve-2024-39479.json" }, { "summary":"openEuler-SA-2024-1863", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1863" }, { "summary":"CVE-2024-39479", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2024-39479&packageName=kernel" } ], "title":"openEuler cve CVE-2024-39479", "tracking":{ "initial_release_date":"2024-07-19T21:24:07+08:00", "revision_history":[ { "date":"2024-07-19T21:24:07+08:00", "summary":"Initial", "number":"1.0.0" }, { "date":"2024-07-22T11:19:45+08:00", "summary":"Current version", "number":"2.0.0" }, { "date":"2024-08-19T17:35:39+08:00", "summary":"Current version", "number":"3.0.0" } ], "generator":{ "date":"2024-08-19T17:35:39+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2024-08-19T17:35:39+08:00", "id":"CVE-2024-39479", "version":"3.0.0", 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However, in i915 there are two separate code\npaths, which both release either drvdata or hwmon and either can be\nreleased before the other. These code paths (for device unbind) are as\nfollows (see also the bug referenced below):\n\nCall Trace:\nrelease_nodes+0x11/0x70\ndevres_release_group+0xb2/0x110\ncomponent_unbind_all+0x8d/0xa0\ncomponent_del+0xa5/0x140\nintel_pxp_tee_component_fini+0x29/0x40 [i915]\nintel_pxp_fini+0x33/0x80 [i915]\ni915_driver_remove+0x4c/0x120 [i915]\ni915_pci_remove+0x19/0x30 [i915]\npci_device_remove+0x32/0xa0\ndevice_release_driver_internal+0x19c/0x200\nunbind_store+0x9c/0xb0\n\nand\n\nCall Trace:\nrelease_nodes+0x11/0x70\ndevres_release_all+0x8a/0xc0\ndevice_unbind_cleanup+0x9/0x70\ndevice_release_driver_internal+0x1c1/0x200\nunbind_store+0x9c/0xb0\n\nThis means that in i915, if use devm, we cannot gurantee that hwmon will\nalways be released before drvdata. Which means that we have a uaf if hwmon\nsysfs is accessed when drvdata has been released but hwmon hasn't.\n\nThe only way out of this seems to be do get rid of devm_ and release/free\neverything explicitly during device unbind.\n\nv2: Change commit message and other minor code changes\nv3: Cleanup from i915_hwmon_register on error (Armin Wolf)\nv4: Eliminate potential static analyzer warning (Rodrigo)\n Eliminate fetch_and_zero (Jani)\nv5: Restore previous logic for ddat_gt->hwmon_dev error return (Andi)", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS:bpftool-6.6.0-34.0.0.41.oe2403.aarch64", "openEuler-24.03-LTS:bpftool-debuginfo-6.6.0-34.0.0.41.oe2403.aarch64", "openEuler-24.03-LTS:kernel-6.6.0-34.0.0.41.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debuginfo-6.6.0-34.0.0.41.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debugsource-6.6.0-34.0.0.41.oe2403.aarch64", 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