CVE-2026-23209: macvlan: fix error recovery in macvlan_common_newlink()

Affected versions

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

• linux linux kernel4.9.1 and later · before 5.10.250
• linux linux kernel5.11 and later · before 5.15.200
• linux linux kernel5.16 and later · before 6.1.163
• linux linux kernel6.2 and later · before 6.6.124
• linux linux kernel6.7 and later · before 6.12.70
• linux linux kernel6.13 and later · before 6.18.10
• linux linux kernel4.9
• linux linux kernel6.19

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

  • 4.9affected
  • aa5fd0fb77486b8a6764ead8627baa14790e4280 and later · before da5c6b8ae47e414be47e5e04def15b25d5c962dcaffected · git
  • aa5fd0fb77486b8a6764ead8627baa14790e4280 and later · before 5dae6b36a7cb7a4fcf4121b95e9ca7f96f816c8aaffected · git
  • aa5fd0fb77486b8a6764ead8627baa14790e4280 and later · before c43d0e787cbba569ec9d11579ed370b50fab6c9caffected · git
  • aa5fd0fb77486b8a6764ead8627baa14790e4280 and later · before 11ba9f0dc865136174cb98834280fb21bbc950c7affected · git
  • aa5fd0fb77486b8a6764ead8627baa14790e4280 and later · before 986967a162142710076782d5b93daab93a892980affected · git
  • aa5fd0fb77486b8a6764ead8627baa14790e4280 and later · before cdedcd5aa3f3cb8b7ae0f87ab3a936d0bd583d66affected · git
  • aa5fd0fb77486b8a6764ead8627baa14790e4280 and later · before f8db6475a83649689c087a8f52486fcc53e627e9affected · git
  • before 4.9not affected · semver
  • 5.10.250 and later · up to and including 5.10.*not 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-2026-23207Feb 14, 2026 · spi: tegra210-quad: Protect curr_xfer check in IRQ handler
  18Monitor
• ← EarlierCVE-2026-23208Feb 14, 2026 · ALSA: usb-audio: Prevent excessive number of frames
  31Monitor
• Later →CVE-2026-23210Feb 14, 2026 · ice: Fix PTP NULL pointer dereference during VSI rebuild
  18Monitor

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.