{"id":"CVE-2021-47483","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nregmap: Fix possible double-free in regcache_rbtree_exit()\n\nIn regcache_rbtree_insert_to_block(), when 'present' realloc failed,\nthe 'blk' which is supposed to assign to 'rbnode-\u003eblock' will be freed,\nso 'rbnode-\u003eblock' points a freed memory, in the error handling path of\nregcache_rbtree_init(), 'rbnode-\u003eblock' will be freed again in\nregcache_rbtree_exit(), KASAN will report double-free as follows:\n\nBUG: KASAN: double-free or invalid-free in kfree+0xce/0x390\nCall Trace:\n slab_free_freelist_hook+0x10d/0x240\n kfree+0xce/0x390\n regcache_rbtree_exit+0x15d/0x1a0\n regcache_rbtree_init+0x224/0x2c0\n regcache_init+0x88d/0x1310\n __regmap_init+0x3151/0x4a80\n __devm_regmap_init+0x7d/0x100\n madera_spi_probe+0x10f/0x333 [madera_spi]\n spi_probe+0x183/0x210\n really_probe+0x285/0xc30\n\nTo fix this, moving up the assignment of rbnode-\u003eblock to immediately after\nthe reallocation has succeeded so that the data structure stays valid even\nif the second reallocation fails.","modified":"2026-03-15T22:43:14.191333Z","published":"2024-05-22T09:15:10.227Z","related":["SUSE-SU-2024:1979-1","SUSE-SU-2024:1983-1","SUSE-SU-2024:2008-1","SUSE-SU-2024:2010-1","SUSE-SU-2024:2011-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2183-1","SUSE-SU-2024:2184-1","SUSE-SU-2024:2185-1","SUSE-SU-2024:2189-1","SUSE-SU-2024:2190-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047"},{"type":"FIX","url":"https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83"},{"type":"FIX","url":"https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6"},{"type":"FIX","url":"https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999"},{"type":"FIX","url":"https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2"},{"type":"FIX","url":"https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f"},{"type":"FIX","url":"https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6"},{"type":"FIX","url":"https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47483.json","unresolved_ranges":[{"events":[{"introduced":"3.12"},{"fixed":"4.4.291"}]},{"events":[{"introduced":"4.5"},{"fixed":"4.9.289"}]},{"events":[{"introduced":"4.10"},{"fixed":"4.14.254"}]},{"events":[{"introduced":"4.15"},{"fixed":"4.19.215"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.157"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.77"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.14.16"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc2"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc3"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc4"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc5"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc6"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc7"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}