CVE-2026-64423: ipv4: igmp: remove multicast group from hash table on device destruction

Affected versions

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

• linux linux kernel3.11 and later · before 5.10.261
• linux linux kernel5.11 and later · before 5.15.212
• linux linux kernel5.16 and later · before 6.1.178
• linux linux kernel6.2 and later · before 6.6.145
• linux linux kernel6.7 and later · before 6.12.96
• linux linux kernel6.13 and later · before 6.18.39
• linux linux kernel6.19 and later · before 7.1.4
• linux linux kernel7.2

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

  • 3.11affected
  • e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 and later · before 412ba7def06ffe974ba9a1d862b022362c54ffa5affected · git
  • e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 and later · before c6cb5f8ebe1c1a78710c19f102db9fe48b9e6ba9affected · git
  • e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 and later · before 5f42729d74bd6c61306d864423290d92962de4e1affected · git
  • e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 and later · before 76d030ac95e17f91d69a595f17ebc5979700cf9aaffected · git
  • e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 and later · before 8820b530cb2388503d7418228d03ba074bf7a03eaffected · git
  • e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 and later · before 2ca18df1c2611f70eb3eb487e02ae85eb703b284affected · git
  • e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 and later · before f91883031e5a62877a29ce139442973cbea769f1affected · git
  • e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 and later · before 7993211bde166471dffac074dc965489f86531f8affected · git
  • before 3.11not 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-2026-64420Jul 25, 2026 · mfd: cros_ec: Delay dev_set_drvdata() until probe success
  28Monitor
• ← EarlierCVE-2026-64422Jul 25, 2026 · net: ipv4: bound TCP reordering sysctl writes and MTU probe sizes
  28Monitor
• Later →CVE-2026-64424Jul 25, 2026 · netpoll: fix a use-after-free on shutdown path
  31Monitor

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.