CVE-2026-23351: netfilter: nft_set_pipapo: split gc into unlink and reclaim phase

Affected versions

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

• linux linux kernel5.6.1 and later · before 5.10.253
• linux linux kernel5.11 and later · before 5.15.203
• linux linux kernel5.16 and later · before 6.1.167
• linux linux kernel6.2 and later · before 6.6.130
• linux linux kernel6.7 and later · before 6.12.77
• linux linux kernel6.13 and later · before 6.18.17
• linux linux kernel6.19 and later · before 6.19.7
• linux linux kernel5.6
• linux linux kernel7.0

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

  • 5.6affected
  • 3c4287f62044a90e73a561aa05fc46e62da173da and later · before 65ca51b9fb85477ab92a04295aed34b38f7c062eaffected · git
  • 3c4287f62044a90e73a561aa05fc46e62da173da and later · before c0f1f85097ac2b6e7d750fe4d05807985cd3fd3aaffected · git
  • 3c4287f62044a90e73a561aa05fc46e62da173da and later · before 16f3595c0441d87dfa005c47d8f95be213afaa9eaffected · git
  • 3c4287f62044a90e73a561aa05fc46e62da173da and later · before 7864c667aed01a58b87ca518a631322cd0ac34c0affected · git
  • 3c4287f62044a90e73a561aa05fc46e62da173da and later · before c12d570d71920903a1a0468b7d13b085203d0c93affected · git
  • 3c4287f62044a90e73a561aa05fc46e62da173da and later · before 500a50a301ce962b019ab95053ac70264fec2c21affected · git
  • 3c4287f62044a90e73a561aa05fc46e62da173da and later · before aff13667708dfa0dce136b8efd81baa9fa6ef261affected · git
  • 3c4287f62044a90e73a561aa05fc46e62da173da and later · before 9df95785d3d8302f7c066050117b04cd3c2048c2affected · git
  • before 5.6not 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-2026-23346Mar 25, 2026 · arm64: io: Extract user memory type in ioremap_prot()
  22Monitor
• ← EarlierCVE-2026-23348Mar 25, 2026 · cxl: Fix race of nvdimm_bus object when creating nvdimm objects
  18Monitor
• Later →CVE-2026-23352Mar 25, 2026 · x86/efi: defer freeing of boot services memory
  22Monitor

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.