Answer in brief
CVE-2021-47483 records a High severity (CVSS 7.8) vulnerability in regmap: Fix possible double-free in regcache_rbtree_exit(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc7:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=3f4ff561bc88b074d5e868dde4012d89cbb06c87 <e72dce9afbdbfa70d9b44f5908a50ff6c4858999 || >=3f4ff561bc88b074d5e868dde4012d89cbb06c87 <fc081477b47dfc3a6cb50a96087fc29674013fc2 || >=3f4ff561bc88b074d5e868dde4012d89cbb06c87 <758ced2c3878ff789801e6fee808e185c5cf08d6 || >=3f4ff561bc88b074d5e868dde4012d89cbb06c87 <3dae1a4eced3ee733d7222e69b8a55caf2d61091 || >=3f4ff561bc88b074d5e868dde4012d89cbb06c87 <1cead23c1c0bc766dacb900a3b0269f651ad596f || >=3f4ff561bc88b074d5e868dde4012d89cbb06c87 <36e911a16b377bde0ad91a8c679069d0d310b1a6 || >=3f4ff561bc88b074d5e868dde4012d89cbb06c87 <50cc1462a668dc62949a1127388bc3af785ce047 || >=3f4ff561bc88b074d5e868dde4012d89cbb06c87 <55e6d8037805b3400096d621091dfbf713f97e83 | e72dce9afbdbfa70d9b44f5908a50ff6c4858999, fc081477b47dfc3a6cb50a96087fc29674013fc2, 758ced2c3878ff789801e6fee808e185c5cf08d6, 3dae1a4eced3ee733d7222e69b8a55caf2d61091, 1cead23c1c0bc766dacb900a3b0269f651ad596f, 36e911a16b377bde0ad91a8c679069d0d310b1a6, 50cc1462a668dc62949a1127388bc3af785ce047, 55e6d8037805b3400096d621091dfbf713f97e83 |
| Linux/Linuxgeneric | 3.12 | Not reported |
Published upstream
May 22, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.