AI Score
Confidence
Low
EPSS
Percentile
13.0%
SSVC
Exploitation
none
Automatable
no
Technical Impact
partial
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().
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "dae52d009fc9",
"lessThan": "4487b968e5ea",
"versionType": "git"
},
{
"status": "affected",
"version": "dae52d009fc9",
"lessThan": "c6ddeb63dd54",
"versionType": "git"
},
{
"status": "affected",
"version": "dae52d009fc9",
"lessThan": "e818f2ff6485",
"versionType": "git"
},
{
"status": "affected",
"version": "dae52d009fc9",
"lessThan": "ec731c6ef564",
"versionType": "git"
},
{
"status": "affected",
"version": "dae52d009fc9",
"lessThan": "e617fa62f6cf",
"versionType": "git"
},
{
"status": "affected",
"version": "dae52d009fc9",
"lessThan": "e991457afdcb",
"versionType": "git"
},
{
"status": "affected",
"version": "dae52d009fc9",
"lessThan": "b9a178f189bb",
"versionType": "git"
},
{
"status": "affected",
"version": "dae52d009fc9",
"lessThan": "8d4abca95ecc",
"versionType": "git"
}
],
"programFiles": [
"drivers/media/pci/ngene/ngene-core.c",
"drivers/media/pci/ngene/ngene.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.34"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.34",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "4.4.277",
"versionType": "custom",
"lessThanOrEqual": "4.4.*"
},
{
"status": "unaffected",
"version": "4.9.277",
"versionType": "custom",
"lessThanOrEqual": "4.9.*"
},
{
"status": "unaffected",
"version": "4.14.241",
"versionType": "custom",
"lessThanOrEqual": "4.14.*"
},
{
"status": "unaffected",
"version": "4.19.199",
"versionType": "custom",
"lessThanOrEqual": "4.19.*"
},
{
"status": "unaffected",
"version": "5.4.136",
"versionType": "custom",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.54",
"versionType": "custom",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.13.6",
"versionType": "custom",
"lessThanOrEqual": "5.13.*"
},
{
"status": "unaffected",
"version": "5.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/media/pci/ngene/ngene-core.c",
"drivers/media/pci/ngene/ngene.h"
],
"defaultStatus": "affected"
}
]
git.kernel.org/stable/c/4487b968e5eacd02c493303dc2b61150bb7fe4b2
git.kernel.org/stable/c/8d4abca95ecc82fc8c41912fa0085281f19cc29f
git.kernel.org/stable/c/b9a178f189bb6d75293573e181928735f5e3e070
git.kernel.org/stable/c/c6ddeb63dd543b5474b0217c4e47538b7ffd7686
git.kernel.org/stable/c/e617fa62f6cf859a7b042cdd6c73af905ff8fca3
git.kernel.org/stable/c/e818f2ff648581a6c553ae2bebc5dcef9a8bb90c
git.kernel.org/stable/c/e991457afdcb5f4dbc5bc9d79eaf775be33e7092
git.kernel.org/stable/c/ec731c6ef564ee6fc101fc5d73e3a3a953d09a00