CVE-2021-47459: can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv

Affected versions

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

• linux linux kernel5.4 and later · before 5.4.156
• linux linux kernel5.5 and later · before 5.10.76
• linux linux kernel5.11 and later · before 5.14.15
• 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

  • 5.4affected
  • 9d71dd0c70099914fcd063135da3c580865e924c and later · before a0e47d2833b4f65e6c799f28c6b636d36b8b936daffected · git
  • 9d71dd0c70099914fcd063135da3c580865e924c and later · before 864e77771a24c877aaf53aee019f78619cbcd668affected · git
  • 9d71dd0c70099914fcd063135da3c580865e924c and later · before 6e8811707e2df0c6ba920f0cad3a3bca7b42132faffected · git
  • 9d71dd0c70099914fcd063135da3c580865e924c and later · before d9d52a3ebd284882f5562c88e55991add5d01586affected · git
  • before 5.4not affected · semver
  • 5.4.156 and later · up to and including 5.4.*not affected · semver
  • 5.10.76 and later · up to and including 5.10.*not affected · semver
  • 5.14.15 and later · up to and including 5.14.*not affected · semver
  • 5.15 and laternot affected · original_commit_for_fix

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-2021-47457May 22, 2024 · can: isotp: isotp_sendmsg(): add result check for wait_event_interruptible()
  22Monitor
• ← EarlierCVE-2021-47458May 22, 2024 · ocfs2: mount fails with buffer overflow in strlen
  31Monitor
• Later →CVE-2021-47460May 22, 2024 · ocfs2: fix data corruption after conversion from inline format
  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.