Security readout for executives and security teams
CVE-2021-33655 is a Linux kernel out-of-bounds memory write triggered through the framebuffer FBIOPUT_VSCREENINFO ioctl. The public sources identify affected kernel versions as 5.18 and 5.19.0-rc1. No CVSS score or KEV listing is provided, so business urgency depends on whether those kernels or related vendor packages are present. Exposure is most plausible on systems running the named Linux kernel versions or vendor kernels addressed by Debian DSA-5191 and DLA 3131-1. The ioctl detail suggests a local kernel interface, but the sources do not define required access, privileges, or device availability. Handle through kernel patch management and asset validation. Escalate priority for shared Linux systems, developer workstations, and hosts running untrusted local workloads. Lack of active-exploitation evidence lowers emergency urgency, but kernel memory corruption remains operationally important. Mitigation focus: Identify Linux hosts running kernel 5.18 or 5.19.0-rc1.; Apply relevant vendor kernel security updates, including Debian advisories where applicable.; If no vendor fix is identified, check current distribution kernel guidance..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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Open ATT&CK lookupCVE-2021-33655 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=086ff84617185393a0bbf25830c4f36412a7d3f4CVE reference · x_refsource_MISC
- DSA-5191CVE reference · vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20221002 [SECURITY] [DLA 3131-1] linux security updateCVE reference · mailing-list, x_refsource_MLIST
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.