CVE-2026-64132: ipv6: ioam: refresh hdr pointer before ioam6_event()

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

  • 6.9affected
  • f655c78d6225f585ef60a9d93ffb79d507ff3ad3 and later · before 769723124b7c3b2bfea4cf68ad292698b87c8d01affected · git
  • f655c78d6225f585ef60a9d93ffb79d507ff3ad3 and later · before 24de676da63c1122d2c13b0d546238b66d1b4e62affected · git
  • f655c78d6225f585ef60a9d93ffb79d507ff3ad3 and later · before 5af905aa8e91ff8d94572a1e089558f21dcf24edaffected · git
  • f655c78d6225f585ef60a9d93ffb79d507ff3ad3 and later · before e46e6bc97fb1f339730ff1ba74267fbf48e7a422affected · git
  • before 6.9not affected · semver
  • 6.12.92 and later · up to and including 6.12.*not affected · semver
  • 6.18.34 and later · up to and including 6.18.*not affected · semver
  • 7.0.11 and later · up to and including 7.0.*not affected · semver
  • 7.1 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-2026-64129Jul 19, 2026 · mm/migrate_device: fix spinlock leak in migrate_vma_insert_huge_pmd_page
  22Monitor
• ← EarlierCVE-2026-64130Jul 19, 2026 · mm/page_alloc: fix initialization of tags of the huge zero folio with init_on_free
  22Monitor
• Later →CVE-2026-64135Jul 19, 2026 · hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX
  22Monitor

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.