CVE-2021-47483
- Source
- https://cve.org/CVERecord?id=CVE-2021-47483
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47483.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47483
- Downstream
- Related
- Published
- 2024-05-22T09:15:10.227Z
- Modified
- 2026-03-10T23:52:24.946548Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
regmap: Fix possible double-free in regcacherbtreeexit()
In regcacherbtreeinserttoblock(), 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 regcacherbtreeinit(), 'rbnode->block' will be freed again in regcacherbtreeexit(), KASAN will report double-free as follows:
BUG: KASAN: double-free or invalid-free in kfree+0xce/0x390 Call Trace: slabfreefreelisthook+0x10d/0x240 kfree+0xce/0x390 regcacherbtreeexit+0x15d/0x1a0 regcacherbtreeinit+0x224/0x2c0 regcacheinit+0x88d/0x1310 __regmap_init+0x3151/0x4a80 _devmregmapinit+0x7d/0x100 maderaspiprobe+0x10f/0x333 [maderaspi] spiprobe+0x183/0x210 reallyprobe+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.
- References
-
- https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f
- https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047
- https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83
- https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6
- https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999
- https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6
- https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091
- https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2
Affected packages
Git /
Database specific
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47483.json"
unresolved_ranges
[
{
"events": [
{
"introduced": "3.12"
},
{
"fixed": "4.4.291"
}
]
},
{
"events": [
{
"introduced": "4.5"
},
{
"fixed": "4.9.289"
}
]
},
{
"events": [
{
"introduced": "4.10"
},
{
"fixed": "4.14.254"
}
]
},
{
"events": [
{
"introduced": "4.15"
},
{
"fixed": "4.19.215"
}
]
},
{
"events": [
{
"introduced": "4.20"
},
{
"fixed": "5.4.157"
}
]
},
{
"events": [
{
"introduced": "5.5"
},
{
"fixed": "5.10.77"
}
]
},
{
"events": [
{
"introduced": "5.11"
},
{
"fixed": "5.14.16"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc1"
}
]
},
{
"events": [
{
"introduced": "0"
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{
"last_affected": "5.15-rc2"
}
]
},
{
"events": [
{
"introduced": "0"
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{
"last_affected": "5.15-rc3"
}
]
},
{
"events": [
{
"introduced": "0"
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{
"last_affected": "5.15-rc4"
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},
{
"events": [
{
"introduced": "0"
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{
"last_affected": "5.15-rc5"
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},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc6"
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},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.15-rc7"
}
]
}
]