CVE-2021-47295: net: sched: fix memory leak in tcindex_partial_destroy_work

Affected versions

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

• linux linux kernel3.18 and later · before 5.4.136
• linux linux kernel5.5 and later · before 5.10.54
• linux linux kernel5.11 and later · before 5.13.6
• linux linux kernel5.14

Versions reported by the vendor

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

• Linux Linux

  • 3.18affected
  • 331b72922c5f58d48fd5500acadc91777cc31970 and later · before 53af9c793f644d5841d84d8e0ad83bd7ab47f3e0affected · git
  • 331b72922c5f58d48fd5500acadc91777cc31970 and later · before 01d0d2b8b4e3cf2110baba9371c0c3d04ad5c77baffected · git
  • 331b72922c5f58d48fd5500acadc91777cc31970 and later · before 8d7924ce85bae64e7a67c366c7c50840f49f3a62affected · git
  • 331b72922c5f58d48fd5500acadc91777cc31970 and later · before 7a6fb69bbcb21e9ce13bdf18c008c268874f0480affected · git
  • 331b72922c5f58d48fd5500acadc91777cc31970 and later · before 8e9662fde6d63c78eb1350f6167f64c9d71a865baffected · git
  • 331b72922c5f58d48fd5500acadc91777cc31970 and later · before 18c3fa7a7fdbb4d21dafc8a7710ae2c1680930f6affected · git
  • 331b72922c5f58d48fd5500acadc91777cc31970 and later · before cac71d27745f92ee13f0ecc668ffe151a4a9c9b1affected · git
  • 331b72922c5f58d48fd5500acadc91777cc31970 and later · before f5051bcece50140abd1a11a2d36dc3ec5484fc32affected · git
  • 331b72922c5f58d48fd5500acadc91777cc31970 and later · before 7c183dc0af472dec33d2c0786a5e356baa8cad19affected · git

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-2021-47293May 21, 2024 · net/sched: act_skbmod: Skip non-Ethernet packets
  31Monitor
• ← EarlierCVE-2021-47294May 21, 2024 · netrom: Decrease sock refcount when sock timers expire
  22Monitor
• Later →CVE-2021-47296May 21, 2024 · KVM: PPC: Fix kvm_arch_vcpu_ioctl vcpu_load leak
  22Monitor

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.