CVE-2021-47235: net: ethernet: fix potential use-after-free in ec_bhf_remove

Affected versions

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

• linux linux kernel3.15 and later · before 4.4.274
• linux linux kernel4.5 and later · before 4.9.274
• linux linux kernel4.10 and later · before 4.14.238
• linux linux kernel4.15 and later · before 4.19.196
• linux linux kernel4.20 and later · before 5.4.128
• linux linux kernel5.5 and later · before 5.10.46
• linux linux kernel5.11 and later · before 5.12.13
• linux linux kernel5.13

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

  • 3.15affected
  • 6af55ff52b02d492d45db88df3e461fa51a6f753 and later · before db2bc3cfd2bc01621014d4f17cdfc74611f339c8affected · git
  • 6af55ff52b02d492d45db88df3e461fa51a6f753 and later · before 1cafc540b7bf1b6a5a77dc000205fe337ef6eba6affected · git
  • 6af55ff52b02d492d45db88df3e461fa51a6f753 and later · before b1ad283755095a4b9d1431aeb357d7df1a33d3bbaffected · git
  • 6af55ff52b02d492d45db88df3e461fa51a6f753 and later · before 0260916843cc74f3906acf8b6f256693e01530a2affected · git
  • 6af55ff52b02d492d45db88df3e461fa51a6f753 and later · before 19f88ca68ccf8771276a606765239b167654f84aaffected · git
  • 6af55ff52b02d492d45db88df3e461fa51a6f753 and later · before 95deeb29d831e2fae608439e243e7a520611e7eaaffected · git
  • 6af55ff52b02d492d45db88df3e461fa51a6f753 and later · before d11d79e52ba080ee567cb7d7eb42a5ade60a8130affected · git
  • 6af55ff52b02d492d45db88df3e461fa51a6f753 and later · before 9cca0c2d70149160407bda9a9446ce0c29b6e6c6affected · git
  • before 3.15not 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-2021-47233May 21, 2024 · regulator: rt4801: Fix NULL pointer dereference if priv->enable_gpios is NULL
  22Monitor
• ← EarlierCVE-2021-47234May 21, 2024 · phy: phy-mtk-tphy: Fix some resource leaks in mtk_phy_init()
  22Monitor
• Later →CVE-2021-47236May 21, 2024 · net: cdc_eem: fix tx fixup skb leak
  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.