CVE-2021-47483
Linux Kernel regmap Double Free
Description
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.
INFO
Published Date :
May 22, 2024, 9:15 a.m.
Last Modified :
Jan. 6, 2025, 7:52 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
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information, practical solutions, and valuable tools related to
CVE-2021-47483.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2021-47483 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47483 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 06, 2025
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE NIST CWE-415 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.12 up to (excluding) 4.4.291 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.5 up to (excluding) 4.9.289 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.254 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.215 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.157 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.77 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.14.16 *cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.15:rc7:*:*:*:*:*:* Changed Reference Type https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f No Types Assigned https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f Patch Changed Reference Type https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f No Types Assigned https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f Patch Changed Reference Type https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6 No Types Assigned https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6 Patch Changed Reference Type https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6 No Types Assigned https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6 Patch Changed Reference Type https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091 No Types Assigned https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091 Patch Changed Reference Type https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091 No Types Assigned https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091 Patch Changed Reference Type https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047 No Types Assigned https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047 Patch Changed Reference Type https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047 No Types Assigned https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047 Patch Changed Reference Type https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83 No Types Assigned https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83 Patch Changed Reference Type https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83 No Types Assigned https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83 Patch Changed Reference Type https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6 No Types Assigned https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6 Patch Changed Reference Type https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6 No Types Assigned https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6 Patch Changed Reference Type https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999 No Types Assigned https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999 Patch Changed Reference Type https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999 No Types Assigned https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999 Patch Changed Reference Type https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2 No Types Assigned https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2 Patch Changed Reference Type https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2 No Types Assigned https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2 Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f Added Reference https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6 Added Reference https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091 Added Reference https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047 Added Reference https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83 Added Reference https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6 Added Reference https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999 Added Reference https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 22, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47483 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47483
weaknesses.