发布于3月6日3月6日 Members Rocky Linux: CVE-2021-47383: kernel (Multiple Advisories) Severity 4 CVSS (AV:L/AC:M/Au:N/C:P/I:P/A:P) Published 05/21/2024 Created 10/03/2024 Added 10/02/2024 Modified 11/19/2024 Description 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. Solution(s) rocky-upgrade-bpftool rocky-upgrade-bpftool-debuginfo rocky-upgrade-kernel rocky-upgrade-kernel-core rocky-upgrade-kernel-cross-headers rocky-upgrade-kernel-debug rocky-upgrade-kernel-debug-core rocky-upgrade-kernel-debug-debuginfo rocky-upgrade-kernel-debug-devel rocky-upgrade-kernel-debug-devel-matched rocky-upgrade-kernel-debug-modules rocky-upgrade-kernel-debug-modules-core rocky-upgrade-kernel-debug-modules-extra rocky-upgrade-kernel-debug-uki-virt rocky-upgrade-kernel-debuginfo rocky-upgrade-kernel-devel rocky-upgrade-kernel-devel-matched rocky-upgrade-kernel-headers rocky-upgrade-kernel-modules rocky-upgrade-kernel-modules-core rocky-upgrade-kernel-modules-extra rocky-upgrade-kernel-rt rocky-upgrade-kernel-rt-core rocky-upgrade-kernel-rt-debug rocky-upgrade-kernel-rt-debug-core rocky-upgrade-kernel-rt-debug-debuginfo rocky-upgrade-kernel-rt-debug-devel rocky-upgrade-kernel-rt-debug-kvm rocky-upgrade-kernel-rt-debug-modules rocky-upgrade-kernel-rt-debug-modules-core rocky-upgrade-kernel-rt-debug-modules-extra rocky-upgrade-kernel-rt-debuginfo rocky-upgrade-kernel-rt-debuginfo-common-x86_64 rocky-upgrade-kernel-rt-devel rocky-upgrade-kernel-rt-kvm rocky-upgrade-kernel-rt-modules rocky-upgrade-kernel-rt-modules-core rocky-upgrade-kernel-rt-modules-extra rocky-upgrade-kernel-tools rocky-upgrade-kernel-tools-debuginfo rocky-upgrade-kernel-tools-libs rocky-upgrade-kernel-tools-libs-devel rocky-upgrade-kernel-uki-virt rocky-upgrade-kernel-zfcpdump rocky-upgrade-kernel-zfcpdump-core rocky-upgrade-kernel-zfcpdump-debuginfo rocky-upgrade-kernel-zfcpdump-devel rocky-upgrade-kernel-zfcpdump-devel-matched rocky-upgrade-kernel-zfcpdump-modules rocky-upgrade-kernel-zfcpdump-modules-core rocky-upgrade-kernel-zfcpdump-modules-extra rocky-upgrade-libperf rocky-upgrade-libperf-debuginfo rocky-upgrade-perf rocky-upgrade-perf-debuginfo rocky-upgrade-python3-perf rocky-upgrade-python3-perf-debuginfo rocky-upgrade-rtla rocky-upgrade-rv References https://attackerkb.com/topics/cve-2021-47383 CVE - 2021-47383 https://errata.rockylinux.org/RLSA-2024:7001 https://errata.rockylinux.org/RLSA-2024:8617
