CVE-2026-23272: netfilter: nf_tables: unconditionally bump set->nelems before insertion

Affected versions

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

• linux linux kernel4.9.33 and later · before 4.10
• linux linux kernel4.10.1 and later · before 6.18.17
• linux linux kernel6.19 and later · before 6.19.7
• linux linux kernel4.10
• 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

  • fefdd79403e89b0c673965343b92e2e01e2713a8, 4.10affected
  • 35d0ac9070ef619e3bf44324375878a1c540387b and later · before 25841e8d4241c6c3763e70ae95050f8108707b46affected · git
  • 35d0ac9070ef619e3bf44324375878a1c540387b and later · before 022effa9c54903858e443b1225370e6c758d03f6affected · git
  • 35d0ac9070ef619e3bf44324375878a1c540387b and later · before 25fcaef7948912652905e96922f36583a84fffedaffected · git
  • 35d0ac9070ef619e3bf44324375878a1c540387b and later · before e3ccb11fc8249759d23326038c8db987ddaabc77affected · git
  • 35d0ac9070ef619e3bf44324375878a1c540387b and later · before 86bc4b1a0f672d47ac19f9022432cb6a2e01cb33affected · git
  • 35d0ac9070ef619e3bf44324375878a1c540387b and later · before 6826131c7674329335ca25df2550163eb8a1fd0caffected · git
  • 35d0ac9070ef619e3bf44324375878a1c540387b and later · before ccb8c8f3c1127cf34d18c737309897c68046bf21affected · git
  • 35d0ac9070ef619e3bf44324375878a1c540387b and later · before def602e498a4f951da95c95b1b8ce8ae68aa733aaffected · git
  • 4.9.33 and later · before 4.10affected · 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-2026-23270Mar 18, 2026 · net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks
  31Monitor
• ← EarlierCVE-2026-23271Mar 20, 2026 · perf: Fix __perf_event_overflow() vs perf_remove_from_context() race
  31Monitor
• Later →CVE-2026-23273Mar 20, 2026 · macvlan: observe an RCU grace period in macvlan_common_newlink() error path
  31Monitor

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.