What’s Vulnerable › Vulnerabilities
CVE-2021-33655
- Severity: medium (CVSS 6.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2022-07-18 · updated 2026-10-14
- Weakness: CWE-787
Description
When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds.
Affected products
- Debian Linux: 10.0, 11.0
- Linux kernel: before 5.19; 5.19-rc1, 5.19-rc2, 5.19-rc3, 5.19-rc4, 5.19-rc5 — fixed in 5.19
How to fix
Upgrade to a fixed version: Linux kernel 5.19. Check the vendor advisory for mitigations.
References
- http://www.openwall.com/lists/oss-security/2022/07/19/2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=086ff84617185393a0bbf25830c4f36412a7d3f4
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
- https://www.debian.org/security/2022/dsa-5191
- http://www.openwall.com/lists/oss-security/2022/07/19/2
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=086ff84617185393a0bbf25830c4f36412a7d3f4
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
- https://www.debian.org/security/2022/dsa-5191
- https://cert-portal.siemens.com/productcert/html/ssa-794697.html
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