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:
tty: Fix out-of-bound vmalloc access in imageblit
This issue happens when a userspace program does an ioctl
FBIOPUT_VSCREENINFO passing the fb_var_screeninfo struct
containing only the fields xres, yres, and bits_per_pixel
with values.
If this struct is the same as the previous ioctl, the
vc_resize() detects it and doesn’t call the resize_screen(),
leaving the fb_var_screeninfo incomplete. And this leads to
the updatescrollmode() calculates a wrong value to
fbcon_display->vrows, which makes the real_y() return a
wrong value of y, and that value, eventually, causes
the imageblit to access an out-of-bound address value.
To solve this issue I made the resize_screen() be called
even if the screen does not need any resizing, so it will
“fix and fill” the fb_var_screeninfo independently.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "7e71fcedfda6",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "70aed03b1d5a",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "067c694d0604",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "8a6a240f52e1",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "883f7897a25e",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "d570c48dd37d",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "699d926585da",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f4",
"lessThan": "3b0c40612471",
"versionType": "git"
}
],
"programFiles": [
"drivers/tty/vt/vt.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "unaffected",
"version": "4.4.286",
"versionType": "custom",
"lessThanOrEqual": "4.4.*"
},
{
"status": "unaffected",
"version": "4.9.285",
"versionType": "custom",
"lessThanOrEqual": "4.9.*"
},
{
"status": "unaffected",
"version": "4.14.249",
"versionType": "custom",
"lessThanOrEqual": "4.14.*"
},
{
"status": "unaffected",
"version": "4.19.209",
"versionType": "custom",
"lessThanOrEqual": "4.19.*"
},
{
"status": "unaffected",
"version": "5.4.151",
"versionType": "custom",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.71",
"versionType": "custom",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.14.10",
"versionType": "custom",
"lessThanOrEqual": "5.14.*"
},
{
"status": "unaffected",
"version": "5.15",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/tty/vt/vt.c"
],
"defaultStatus": "affected"
}
]
git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9
git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c
git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b
git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b
git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f
git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a
git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325
git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560