CVE-2021-47288
- Source
- https://cve.org/CVERecord?id=CVE-2021-47288
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47288.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47288
- Downstream
- Related
- Published
- 2024-05-21T15:15:16Z
- Modified
- 2026-03-23T05:06:21Z
- Severity
-
- 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
media: ngene: Fix out-of-bounds bug in ngene_command_config_free_buf()
Fix an 11-year old bug in ngene_command_config_free_buf() while addressing the following warnings caught with -Warray-bounds:
arch/alpha/include/asm/string.h:22:16: warning: '__builtin_memcpy' offset [12, 16] from the object at 'com' is out of the bounds of referenced subobject 'config' with type 'unsigned char' at offset 10 [-Warray-bounds] arch/x86/include/asm/string_32.h:182:25: warning: '__builtin_memcpy' offset [12, 16] from the object at 'com' is out of the bounds of referenced subobject 'config' with type 'unsigned char' at offset 10 [-Warray-bounds]
The problem is that the original code is trying to copy 6 bytes of data into a one-byte size member config of the wrong structue FW_CONFIGURE_BUFFERS, in a single call to memcpy(). This causes a legitimate compiler warning because memcpy() overruns the length of &com.cmd.ConfigureBuffers.config. It seems that the right structure is FW_CONFIGURE_FREE_BUFFERS, instead, because it contains 6 more members apart from the header hdr. Also, the name of the function ngene_command_config_free_buf() suggests that the actual intention is to ConfigureFreeBuffers, instead of ConfigureBuffers (which takes place in the function ngene_command_config_buf(), above).
Fix this by enclosing those 6 members of struct FW_CONFIGURE_FREE_BUFFERS into new struct config, and use &com.cmd.ConfigureFreeBuffers.config as the destination address, instead of &com.cmd.ConfigureBuffers.config, when calling memcpy().
This also helps with the ongoing efforts to globally enable -Warray-bounds and get us closer to being able to tighten the FORTIFY_SOURCE routines on memcpy().
- References
-
- https://git.kernel.org/stable/c/e991457afdcb5f4dbc5bc9d79eaf775be33e7092
- https://git.kernel.org/stable/c/ec731c6ef564ee6fc101fc5d73e3a3a953d09a00
- https://git.kernel.org/stable/c/4487b968e5eacd02c493303dc2b61150bb7fe4b2
- https://git.kernel.org/stable/c/8d4abca95ecc82fc8c41912fa0085281f19cc29f
- https://git.kernel.org/stable/c/b9a178f189bb6d75293573e181928735f5e3e070
- https://git.kernel.org/stable/c/c6ddeb63dd543b5474b0217c4e47538b7ffd7686
- https://git.kernel.org/stable/c/e617fa62f6cf859a7b042cdd6c73af905ff8fca3
- https://git.kernel.org/stable/c/e818f2ff648581a6c553ae2bebc5dcef9a8bb90c
Affected packages
Git /
Database specific
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47288.json"
unresolved_ranges
[
{
"events": [
{
"introduced": "2.6.34"
},
{
"fixed": "4.4.277"
}
]
},
{
"events": [
{
"introduced": "4.5"
},
{
"fixed": "4.9.277"
}
]
},
{
"events": [
{
"introduced": "4.10"
},
{
"fixed": "4.14.241"
}
]
},
{
"events": [
{
"introduced": "4.15"
},
{
"fixed": "4.19.199"
}
]
},
{
"events": [
{
"introduced": "4.20"
},
{
"fixed": "5.4.136"
}
]
},
{
"events": [
{
"introduced": "5.5"
},
{
"fixed": "5.10.54"
}
]
},
{
"events": [
{
"introduced": "5.11"
},
{
"fixed": "5.13.6"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.14-rc1"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "5.14-rc2"
}
]
}
]