CVE-2021-47372: net: macb: fix use after free on rmmod

Affected versions

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

• linux linux kernelbefore 4.14.249
• linux linux kernel4.15 and later · before 4.19.209
• linux linux kernel4.20 and later · before 5.4.150
• linux linux kernel5.5 and later · before 5.10.70
• linux linux kernel5.11 and later · before 5.14.9
• linux linux kernel5.15

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

  • 4.10affected
  • 83a77e9ec4150ee4acc635638f7dedd9da523a26 and later · before a7d521cc726f30b8e679a6f36d04b18a8ab3c536affected · git
  • 83a77e9ec4150ee4acc635638f7dedd9da523a26 and later · before 46670fb832ee80943715df618632ca13c2e96f2baffected · git
  • 83a77e9ec4150ee4acc635638f7dedd9da523a26 and later · before 1da750d1e2140ef43d64d17f301ff6f41b45541eaffected · git
  • 83a77e9ec4150ee4acc635638f7dedd9da523a26 and later · before 7721221e87d25c9840d9ca6b986dbdc410d5ce2baffected · git
  • 83a77e9ec4150ee4acc635638f7dedd9da523a26 and later · before 4ad6f2d23b0f6ac0d3e5f3102a4256d1c86c90f5affected · git
  • 83a77e9ec4150ee4acc635638f7dedd9da523a26 and later · before d82d5303c4c539db86588ffb5dc5b26c3f1513e8affected · git
  • before 4.10not affected · semver
  • 4.14.249 and later · up to and including 4.14.*not affected · semver
  • 4.19.209 and later · up to and including 4.19.*not affected · semver

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-2021-47370May 21, 2024 · mptcp: ensure tx skbs always have the MPTCP ext
  22Monitor
• ← EarlierCVE-2021-47371May 21, 2024 · nexthop: Fix memory leaks in nexthop notification chain listeners
  28Monitor
• Later →CVE-2021-47373May 21, 2024 · irqchip/gic-v3-its: Fix potential VPE leak on error
  22Monitor

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.