CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
50.6%
In the Linux kernel, the following vulnerability has been resolved:
swiotlb: fix info leak with DMA_FROM_DEVICE
The problem Iβm addressing was discovered by the LTP test covering
cve-2018-1000204.
A short description of what happens follows:
One can argue that this is an swiotlb problem, because without swiotlb
we leak all zeros, and the swiotlb should be transparent in a sense that
it does not affect the outcome (if all other participants are well
behaved).
Copying the content of the original buffer into the swiotlb buffer is
the only way I can think of to make swiotlb transparent in such
scenarios. So letβs do just that if in doubt, but allow the driver
to tell us that the whole mapped buffer is going to be overwritten,
in which case we can preserve the old behavior and avoid the performance
impact of the extra bounce.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"Documentation/core-api/dma-attributes.rst",
"include/linux/dma-mapping.h",
"kernel/dma/swiotlb.c"
],
"versions": [
{
"version": "1da177e4c3f4",
"lessThan": "c132f2ba716b",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "971e5dadffd0",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "8d9ac1b6665c",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "6bfc5377a210",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "d4d975e79210",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "7403f4118ab9",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "270475d6d241",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "ddbd89deb7d3",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"Documentation/core-api/dma-attributes.rst",
"include/linux/dma-mapping.h",
"kernel/dma/swiotlb.c"
],
"versions": [
{
"version": "4.9.320",
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.14.281",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.245",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.189",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.110",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.29",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.16.15",
"lessThanOrEqual": "5.16.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.17",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/270475d6d2410ec66e971bf181afe1958dad565e
git.kernel.org/stable/c/6bfc5377a210dbda2a237f16d94d1bd4f1335026
git.kernel.org/stable/c/7403f4118ab94be837ab9d770507537a8057bc63
git.kernel.org/stable/c/8d9ac1b6665c73f23e963775f85d99679fd8e192
git.kernel.org/stable/c/971e5dadffd02beba1063e7dd9c3a82de17cf534
git.kernel.org/stable/c/c132f2ba716b5ee6b35f82226a6e5417d013d753
git.kernel.org/stable/c/d4d975e7921079f877f828099bb8260af335508f
git.kernel.org/stable/c/ddbd89deb7d32b1fbb879f48d68fda1a8ac58e8e