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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 23.10 | noarch | linux | < any | UNKNOWN |
ubuntu | 24.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 14.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 16.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux-aws | < any | UNKNOWN |
git.kernel.org/linus/3b0c406124719b625b1aba431659f5cdc24a982c (5.15-rc1)
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
launchpad.net/bugs/cve/CVE-2021-47383
nvd.nist.gov/vuln/detail/CVE-2021-47383
security-tracker.debian.org/tracker/CVE-2021-47383
www.cve.org/CVERecord?id=CVE-2021-47383