CVE-2021-47356: mISDN: fix possible use-after-free in HFC_cleanup()

Affected versions

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

• linux linux kernelbefore 4.4.276
• linux linux kernel4.5 and later · before 4.9.276
• linux linux kernel4.10 and later · before 4.14.240
• linux linux kernel4.15 and later · before 4.19.198
• linux linux kernel4.20 and later · before 5.4.133
• linux linux kernel5.5 and later · before 5.10.51
• linux linux kernel5.11 and later · before 5.12.18
• linux linux kernel5.13 and later · before 5.13.3

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

  • 2.6.29affected
  • 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and later · before 49331c07ef0f8fdfa42b30ba6a83a657b29d7fbeaffected · git
  • 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and later · before 54ff3202928952a100c477248e65ac6db01258a7affected · git
  • 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and later · before 7867ddc5f3de7f289aee63233afc0df4b62834c5affected · git
  • 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and later · before 5f2818185da0fe82a932f0856633038b66faf124affected · git
  • 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and later · before 3ecd228c636ee17c14662729737fa07242a93cb0affected · git
  • 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and later · before b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802daffected · git
  • 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and later · before 61370ff07e0acc657559a8fac02551dfeb9d3020affected · git
  • 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and later · before ed7c3739d0a07e2ec3ccbffe7e93cea01c438cdaaffected · git
  • 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and later · before 009fc857c5f6fda81f2f7dd851b2d54193a8e733affected · 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-2021-47354May 21, 2024 · drm/sched: Avoid data corruptions
  28Monitor
• ← EarlierCVE-2021-47355May 21, 2024 · atm: nicstar: Fix possible use-after-free in nicstar_cleanup()
  31Monitor
• Later →CVE-2021-47357May 21, 2024 · atm: iphase: fix possible use-after-free in ia_module_exit()
  31Monitor

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

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

1free(dev->buf);2/* ... another thread is still running ... */3process(dev->buf);

1lock(&dev->lock);2free(dev->buf);3dev->buf = NULL;4unlock(&dev->lock);

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.