{"cve":"CVE-2021-47483","nvd":{"published":"2024-05-22T09:15:10.227","modified":"2026-08-04T10:17:05.090","status":"Modified","description":"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->block' will be freed,\nso 'rbnode->block' points a freed memory, in the error handling path of\nregcache_rbtree_init(), 'rbnode->block' 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->block to immediately after\nthe reallocation has succeeded so that the data structure stays valid even\nif the second reallocation fails.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-415"],"references":["https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f","https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6","https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091","https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047","https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2021-47483","score":0.00229,"percentile":0.13745,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}