CVE-2026-64032: bridge: mcast: Fix a possible use-after-free when removing a bridge port

Affected versions

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

• linux linux kernel5.15.186 and later · before 5.15.209
• linux linux kernel6.1.142 and later · before 6.1.175
• linux linux kernel6.6.95 and later · before 6.6.142
• linux linux kernel6.12.35 and later · before 6.12.92
• linux linux kernel6.15.4 and later · before 6.18.34
• linux linux kernel6.19 and later · before 7.0.11
• 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

  • c996e25df0b3282c724bb5aca434518bc08cd963, 6.16affected
  • 410a033bfa8c7daefbae0225c836693db2149ec1 and later · before ddefd1b8e5eb58933a697ab38334f0fd82e7fb8baffected · git
  • c6d16eab122744df698f18b47cf771945cd55066 and later · before ed3b69e60385a03df11c6d12e5d7bdf0f4a11b70affected · git
  • b4c83b37490d61cfdd62a2b29e98a9b89004b5c0 and later · before 1900ca8acb92fbea8bf9abef9927c7fed03db7fcaffected · git
  • 78f768e36c065ca3f88272fcf39014782c2d4ecd and later · before ebe5561154c823b323bd06e350b55e0b8604d851affected · git
  • 4b30ae9adb047dd0a7982975ec3933c529537026 and later · before a9224862d597d0eed0a34bbb27343f703fc4113faffected · git
  • 4b30ae9adb047dd0a7982975ec3933c529537026 and later · before 7213256c91ed778a0997c2029c152b18dc50e4fdaffected · git
  • 4b30ae9adb047dd0a7982975ec3933c529537026 and later · before 4df78ff02629c7729168f0696a7a2123c389818daffected · git
  • 5.15.186 and later · before 5.15.209affected · semver
  • 6.1.142 and later · before 6.1.175affected · 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-2026-64030Jul 19, 2026 · wifi: mac80211: bounds-check link_id in ieee80211_ml_epcs
  35Monitor
• ← EarlierCVE-2026-64031Jul 19, 2026 · erofs: fix managed cache race for unaligned extents
  31Monitor
• Later →CVE-2026-64033Jul 19, 2026 · RDMA/rtrs: Fix use-after-free in path file creation cleanup
  39Monitor

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.