When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- http://www.openwall.com/lists/oss-security/2022/07/19/3 Mailing List, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/07/19/3 Mailing List, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch Patch, Third Party Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.8 · openatom, linux, debianNVD modified 2026-10-08 22:17
Affected (CPE criteria) 5
cpe:2.3:o:openatom:openeuler:20.03:-:*:*:lts:*:*:*cpe:2.3:o:openatom:openeuler:20.03:sp1:*:*:lts:*:*:*cpe:2.3:o:openatom:openeuler:20.03:sp3:*:*:lts:*:*:*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
References 8
- http://www.openwall.com/lists/oss-security/2022/07/19/3 Mailing List, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html Mailing List, Third Party Advisory
- https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/07/19/3 Mailing List, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html Mailing List, Third Party Advisory
- https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel Third Party Advisory