CVE-2021-3669: A flaw was found in the Linux kernel.

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• debian debian linux10.0
• debian debian linux11.0
• fedoraproject fedora34
• ibm spectrum copy data management2.2.0.0 and later · up to 2.2.15.0 inclusive
• ibm spectrum protect plus10.1.0 and later · up to 10.1.10.2 inclusive
• linux linux kernelall versions
• redhat build of quarkus2.0 and later · before 2.7
• redhat codeready linux builderall versions
• redhat developer tools1.0
• redhat enterprise linux6.0
• redhat enterprise linux7.0
• redhat enterprise linux8.0
• redhat enterprise linux aus8.6
• redhat enterprise linux for ibm z systems8.0
• redhat enterprise linux for ibm z systems eus8.6
• redhat enterprise linux for power little endian8.0
• redhat enterprise linux for power little endian eus8.6
• redhat enterprise linux for real time8
• redhat enterprise linux for real time for nfv8
• redhat enterprise linux for real time for nfv tus8.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

• n/a kernel

  • Not Knownaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
  90Now
• CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
  89Now
• CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
  85Now

Published before and after this one in the same product

• ← EarlierCVE-2022-2991Aug 25, 2022 · A heap-based buffer overflow was found in the Linux kernel's LightNVM subsystem.
  26Monitor
• ← EarlierCVE-2022-2959Aug 25, 2022 · A race condition was found in the Linux kernel's watch queue due to a missing lock in pipe_resize_ring().
  28Monitor
• Later →CVE-2021-3864Aug 26, 2022 · A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants.
  28Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1function expand(node) {2  return node.children.map(expand);3}

1const MAX_DEPTH = 32;2function expand(node, depth = 0) {3  if (depth > MAX_DEPTH) throw new Error("too deep");4  return node.children.map((c) => expand(c, depth + 1));5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.