CVE-2026-64002: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table()

Affected versions

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

• linux linux kernel3.16 and later · before 5.10.259
• linux linux kernel5.11 and later · before 5.15.210
• linux linux kernel5.16 and later · before 6.1.176
• linux linux kernel6.2 and later · before 6.6.143
• linux linux kernel6.7 and later · before 6.12.93
• linux linux kernel6.13 and later · before 6.18.35
• linux linux kernel6.19 and later · before 7.0.12
• linux linux kernel7.1

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

  • 3.16affected
  • 122ff243f5f104194750ecbc76d5946dd1eec934 and later · before ecf45080a4d3f4526cacb8b14060fe3b49a6913baffected · git
  • 122ff243f5f104194750ecbc76d5946dd1eec934 and later · before a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06caffected · git
  • 122ff243f5f104194750ecbc76d5946dd1eec934 and later · before 5b23a2ff379e70b6b9ff744a972b63e1f8f4d996affected · git
  • 122ff243f5f104194750ecbc76d5946dd1eec934 and later · before 8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57affected · git
  • 122ff243f5f104194750ecbc76d5946dd1eec934 and later · before 6512c57c4638ddec113bf42439361ba85a12048daffected · git
  • 122ff243f5f104194750ecbc76d5946dd1eec934 and later · before a7f4eefb6e1458431eef9fa20fb363320d185f76affected · git
  • 122ff243f5f104194750ecbc76d5946dd1eec934 and later · before 155f90be5ee8be5b110ebc0b7da33c54c83b0208affected · git
  • 122ff243f5f104194750ecbc76d5946dd1eec934 and later · before 87a1e0fe7776da7ab411be332b4be58ac8840d10affected · git
  • before 3.16not 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-2026-64000Jul 19, 2026 · net: hsr: fix potential OOB access in supervision frame handling
  39Monitor
• ← EarlierCVE-2026-64001Jul 19, 2026 · ALSA: pcm: oss: Fix setup list UAF on proc write error
  31Monitor
• Later →CVE-2026-64003Jul 19, 2026 · scsi: core: Run queues for all non-SDEV_DEL devices from scsi_run_host_queues
  30Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.