CVE-2020-28915
First published: Mon Nov 16 2020(Updated: )
A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be used by local attackers to read kernel memory, aka CID-6735b4632def.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-372.13.1.rt7.170.el8_6 | 0:4.18.0-372.13.1.rt7.170.el8_6 |
| redhat/kernel | <0:4.18.0-372.13.1.el8_6 | 0:4.18.0-372.13.1.el8_6 |
| Linux Linux kernel | <5.8.15 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
Remedy
Add 'nomodeset' option as kernel boot parameter to disable frame buffering (edit /etc/default/grub, and run 'grub2-mkconfig -o /boot/grub2/grub.cfg' and reboot). ~~~ # cat /proc/cmdline BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-147.el8.x86_64 root=/dev/mapper/rhel_rhel8u2--1-root ro crashkernel=auto resume=/dev/mapper/rhel_rhel8u2--1-swap rd.lvm.lv=rhel_rhel8u2-1/root rd.lvm.lv=rhel_rhel8u2-1/swap nomodeset # ls -l /dev/fb* ls: cannot access '/dev/fb*': No such file or directory ~~~
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2020-28915 https://nvd.nist.gov/vuln/detail/CVE-2020-28915
- https://bugzilla.redhat.com/show_bug.cgi?id=1899177
- https://access.redhat.com/errata/RHSA-2022:5344
- https://access.redhat.com/errata/RHSA-2022:5316
- https://access.redhat.com/security/cve/cve-2020-28915
- https://bugzilla.suse.com/show_bug.cgi?id=1178886
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.15
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5af08640795b2b9a940c9266c0260455377ae262
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6735b4632def0640dbdf4eb9f99816aca18c4f16
- https://syzkaller.appspot.com/bug?id=08b8be45afea11888776f897895aef9ad1c3ecfd
- https://launchpad.net/bugs/cve/CVE-2020-28915
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1899178
- https://git.kernel.org/linus/5af08640795b2b9a940c9266c0260455377ae262
- https://security-tracker.debian.org/tracker/CVE-2020-28915
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28915
- https://nvd.nist.gov/vuln/detail/CVE-2020-28915
- https://ubuntu.com/security/CVE-2020-28915
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