CVE-2021-47483
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
regmap: Fix possible double-free in regcache_rbtree_exit()
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->block' will be freed, so 'rbnode->block' points a freed memory, in the error handling path of regcache_rbtree_init(), 'rbnode->block' 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->block to immediately after the reallocation has succeeded so that the data structure stays valid even if the second reallocation fails.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3f4ff561bc88b074d5e868dde4012d89cbb06c87 | affected | git | e72dce9afbdbfa70d9b44f5908a50ff6c4858999 | Unavailable | None listed |
| 3f4ff561bc88b074d5e868dde4012d89cbb06c87 | affected | git | fc081477b47dfc3a6cb50a96087fc29674013fc2 | Unavailable | None listed |
| 3f4ff561bc88b074d5e868dde4012d89cbb06c87 | affected | git | 758ced2c3878ff789801e6fee808e185c5cf08d6 | Unavailable | None listed |
| 3f4ff561bc88b074d5e868dde4012d89cbb06c87 | affected | git | 3dae1a4eced3ee733d7222e69b8a55caf2d61091 | Unavailable | None listed |
| 3f4ff561bc88b074d5e868dde4012d89cbb06c87 | affected | git | 1cead23c1c0bc766dacb900a3b0269f651ad596f | Unavailable | None listed |
| 3f4ff561bc88b074d5e868dde4012d89cbb06c87 | affected | git | 36e911a16b377bde0ad91a8c679069d0d310b1a6 | Unavailable | None listed |
| 3f4ff561bc88b074d5e868dde4012d89cbb06c87 | affected | git | 50cc1462a668dc62949a1127388bc3af785ce047 | Unavailable | None listed |
| 3f4ff561bc88b074d5e868dde4012d89cbb06c87 | affected | git | 55e6d8037805b3400096d621091dfbf713f97e83 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3.12 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.12 | Unavailable | None listed |
| 4.4.291 | unaffected | semver | Unavailable | 4.4.* | None listed |
| 4.9.289 | unaffected | semver | Unavailable | 4.9.* | None listed |
| 4.14.254 | unaffected | semver | Unavailable | 4.14.* | None listed |
| 4.19.215 | unaffected | semver | Unavailable | 4.19.* | None listed |
| 5.4.157 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.77 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.14.16 | unaffected | semver | Unavailable | 5.14.* | None listed |
| 5.15 | unaffected | original_commit_for_fix | Unavailable | * | None listed |