CVE-2021-47483

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3f4ff561bc88b074d5e868dde4012d89cbb06c87 < e72dce9afbdbfa70d9b44f5908a50ff6c4858999affected
LinuxLinux3f4ff561bc88b074d5e868dde4012d89cbb06c87 < fc081477b47dfc3a6cb50a96087fc29674013fc2affected
LinuxLinux3f4ff561bc88b074d5e868dde4012d89cbb06c87 < 758ced2c3878ff789801e6fee808e185c5cf08d6affected
LinuxLinux3f4ff561bc88b074d5e868dde4012d89cbb06c87 < 3dae1a4eced3ee733d7222e69b8a55caf2d61091affected
LinuxLinux3f4ff561bc88b074d5e868dde4012d89cbb06c87 < 1cead23c1c0bc766dacb900a3b0269f651ad596faffected
LinuxLinux3f4ff561bc88b074d5e868dde4012d89cbb06c87 < 36e911a16b377bde0ad91a8c679069d0d310b1a6affected
LinuxLinux3f4ff561bc88b074d5e868dde4012d89cbb06c87 < 50cc1462a668dc62949a1127388bc3af785ce047affected
LinuxLinux3f4ff561bc88b074d5e868dde4012d89cbb06c87 < 55e6d8037805b3400096d621091dfbf713f97e83affected
LinuxLinux3.12affected
LinuxLinux0 < 3.12unaffected
LinuxLinux4.4.291 <= 4.4.*unaffected
LinuxLinux4.9.289 <= 4.9.*unaffected
LinuxLinux4.14.254 <= 4.14.*unaffected
LinuxLinux4.19.215 <= 4.19.*unaffected
LinuxLinux5.4.157 <= 5.4.*unaffected
LinuxLinux5.10.77 <= 5.10.*unaffected
LinuxLinux5.14.16 <= 5.14.*unaffected
LinuxLinux5.15 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References