{"id":"DEBIAN-CVE-2021-47483","details":"In the Linux kernel, the following vulnerability has been resolved:  regmap: Fix possible double-free in regcache_rbtree_exit()  In regcache_rbtree_insert_to_block(), when 'present' realloc failed, the 'blk' which is supposed to assign to 'rbnode-\u003eblock' will be freed, so 'rbnode-\u003eblock' points a freed memory, in the error handling path of regcache_rbtree_init(), 'rbnode-\u003eblock' will be freed again in regcache_rbtree_exit(), KASAN will report double-free as follows:  BUG: KASAN: double-free or invalid-free in kfree+0xce/0x390 Call Trace:  slab_free_freelist_hook+0x10d/0x240  kfree+0xce/0x390  regcache_rbtree_exit+0x15d/0x1a0  regcache_rbtree_init+0x224/0x2c0  regcache_init+0x88d/0x1310  __regmap_init+0x3151/0x4a80  __devm_regmap_init+0x7d/0x100  madera_spi_probe+0x10f/0x333 [madera_spi]  spi_probe+0x183/0x210  really_probe+0x285/0xc30  To fix this, moving up the assignment of rbnode-\u003eblock to immediately after the reallocation has succeeded so that the data structure stays valid even if the second reallocation fails.","modified":"2026-09-15T09:02:35.888995813Z","published":"2024-05-22T09:15:10.227Z","upstream":["CVE-2021-47483"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47483"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47483.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47483.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47483.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}