{ "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\nhwrng: core - use RCU and work_struct to fix race condition\n\nCurrently, hwrng_fill is not cleared until the hwrng_fillfn() thread\nexits. Since hwrng_unregister() reads hwrng_fill outside the rng_mutex\nlock, a concurrent hwrng_unregister() may call kthread_stop() again on\nthe same task.\n\nAdditionally, if hwrng_unregister() is called immediately after\nhwrng_register(), the stopped thread may have never been executed. Thus,\nhwrng_fill remains dirty even after hwrng_unregister() returns. In this\ncase, subsequent calls to hwrng_register() will fail to start new\nthreads, and hwrng_unregister() will call kthread_stop() on the same\nfreed task. In both cases, a use-after-free occurs:\n\nrefcount_t: addition on 0; use-after-free.\nWARNING: ... at lib/refcount.c:25 refcount_warn_saturate+0xec/0x1c0\nCall Trace:\n kthread_stop+0x181/0x360\n hwrng_unregister+0x288/0x380\n virtrng_remove+0xe3/0x200\n\nThis patch fixes the race by protecting the global hwrng_fill pointer\ninside the rng_mutex lock, so that hwrng_fillfn() thread is stopped only\nonce, and calls to kthread_run() and kthread_stop() are serialized\nwith the lock held.\n\nTo avoid deadlock in hwrng_fillfn() while being stopped with the lock\nheld, we convert current_rng to RCU, so that get_current_rng() can read\ncurrent_rng without holding the lock. To remove the lock from put_rng(),\nwe also delay the actual cleanup into a work_struct.\n\nSince get_current_rng() no longer returns ERR_PTR values, the IS_ERR()\nchecks are removed from its callers.\n\nWith hwrng_fill protected by the rng_mutex lock, hwrng_fillfn() can no\nlonger clear hwrng_fill itself. Therefore, if hwrng_fillfn() returns\ndirectly after current_rng is dropped, kthread_stop() would be called on\na freed task_struct later. To fix this, hwrng_fillfn() calls schedule()\nnow to keep the task alive until being stopped. The kthread_stop() call\nis also moved from hwrng_unregister() to drop_current_rng(), ensuring\nkthread_stop() is called on all possible paths where current_rng becomes\nNULL, so that the thread would not wait forever.", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45949" }, { "summary":"CVE-2026-45949 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-45949.json" }, { "summary":"openEuler-SA-2026-2676", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2676" }, { "summary":"CVE-2026-45949", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-45949&packageName=kernel" } ], "title":"openEuler cve CVE-2026-45949", "tracking":{ "initial_release_date":"2026-06-18T16:38:57+08:00", "revision_history":[ { "date":"2026-06-18T16:38:57+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-06-18T16:38:57+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-06-18T16:38:57+08:00", "id":"CVE-2026-45949", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS-SP3" }, "product_id":"openEuler-24.03-LTS-SP3", "name":"openEuler-24.03-LTS-SP3" }, "name":"openEuler-24.03-LTS-SP3", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS-SP3" }, "product_id":"bpftool-6.6.0-145.3.15.146.oe2403sp3.aarch64.rpm", "name":"bpftool-6.6.0-145.3.15.146.oe2403sp3.aarch64.rpm" }, 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race condition\n\nCurrently, hwrng_fill is not cleared until the hwrng_fillfn() thread\nexits. Since hwrng_unregister() reads hwrng_fill outside the rng_mutex\nlock, a concurrent hwrng_unregister() may call kthread_stop() again on\nthe same task.\n\nAdditionally, if hwrng_unregister() is called immediately after\nhwrng_register(), the stopped thread may have never been executed. Thus,\nhwrng_fill remains dirty even after hwrng_unregister() returns. In this\ncase, subsequent calls to hwrng_register() will fail to start new\nthreads, and hwrng_unregister() will call kthread_stop() on the same\nfreed task. In both cases, a use-after-free occurs:\n\nrefcount_t: addition on 0; use-after-free.\nWARNING: ... at lib/refcount.c:25 refcount_warn_saturate+0xec/0x1c0\nCall Trace:\n kthread_stop+0x181/0x360\n hwrng_unregister+0x288/0x380\n virtrng_remove+0xe3/0x200\n\nThis patch fixes the race by protecting the global hwrng_fill pointer\ninside the rng_mutex lock, so that hwrng_fillfn() thread is stopped only\nonce, and calls to kthread_run() and kthread_stop() are serialized\nwith the lock held.\n\nTo avoid deadlock in hwrng_fillfn() while being stopped with the lock\nheld, we convert current_rng to RCU, so that get_current_rng() can read\ncurrent_rng without holding the lock. To remove the lock from put_rng(),\nwe also delay the actual cleanup into a work_struct.\n\nSince get_current_rng() no longer returns ERR_PTR values, the IS_ERR()\nchecks are removed from its callers.\n\nWith hwrng_fill protected by the rng_mutex lock, hwrng_fillfn() can no\nlonger clear hwrng_fill itself. Therefore, if hwrng_fillfn() returns\ndirectly after current_rng is dropped, kthread_stop() would be called on\na freed task_struct later. To fix this, hwrng_fillfn() calls schedule()\nnow to keep the task alive until being stopped. The kthread_stop() call\nis also moved from hwrng_unregister() to drop_current_rng(), ensuring\nkthread_stop() is called on all possible paths where current_rng becomes\nNULL, so that the thread would not wait forever.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS-SP3:bpftool-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:bpftool-debuginfo-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-debuginfo-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-debugsource-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-devel-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-extra-modules-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-headers-6.6.0-145.3.15.146.oe2403sp3.aarch64", 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"baseScore":5.5, "vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version":"3.1" }, "products":[ "openEuler-24.03-LTS-SP3:bpftool-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:bpftool-debuginfo-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-debuginfo-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-debugsource-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-devel-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-extra-modules-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-headers-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-source-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-tools-6.6.0-145.3.15.146.oe2403sp3.aarch64", "openEuler-24.03-LTS-SP3:kernel-tools-debuginfo-6.6.0-145.3.15.146.oe2403sp3.aarch64", 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