Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-23399

CVE-2026-23399MEDIUM

Linux Linux — nf_tables: nft_dynset: fix possible stateful expression memleak in error path

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  N  N  H    5.5   .0012    1.7     —

AFFECTED
  Product  Versions                                    Fixed
  Linux    563125a73ac30d7036ae69ca35c40500562c1de4 –  —
  Linux    5.11 –                                      5.15.209

TIMELINE
  Jan 13  Reserved by Linux
  Mar 28  Published (CNA: Linux)
  Sep 8   ENRICHED — CVE-2026-23399 (Linux). Received CVSS 5.5 and CPE data from NVD.

CWE-401 · CNA: Linux · CVSS v3.1 · 8 references · NVD status: Modified

Description

In the Linux kernel, the following vulnerability has been resolved: nf_tables: nft_dynset: fix possible stateful expression memleak in error path If cloning the second stateful expression in the element via GFP_ATOMIC fails, then the first stateful expression remains in place without being released. unreferenced object (percpu) 0x607b97e9cab8 (size 16): comm "softirq", pid 0, jiffies 4294931867 hex dump (first 16 bytes on cpu 3): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 backtrace (crc 0): pcpu_alloc_noprof+0x453/0xd80 nft_counter_clone+0x9c/0x190 [nf_tables] nft_expr_clone+0x8f/0x1b0 [nf_tables] nft_dynset_new+0x2cb/0x5f0 [nf_tables] nft_rhash_update+0x236/0x11c0 [nf_tables] nft_dynset_eval+0x11f/0x670 [nf_tables] nft_do_chain+0x253/0x1700 [nf_tables] nft_do_chain_ipv4+0x18d/0x270 [nf_tables] nf_hook_slow+0xaa/0x1e0 ip_local_deliver+0x209/0x330

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 13, 2026	Reserved	Reserved by Linux
March 28, 2026	Published	Published (CNA: Linux)
September 8, 2026	ENRICHED	ENRICHED — CVE-2026-23399 (Linux). Received CVSS 5.5 and CPE data from NVD.

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Linux	Linux	—	563125a73ac30d7036ae69ca35c40500562c1de4	—
Linux	Linux	—	5.11	5.15.209

Weaknesses

CWE-401

References (8)

Authoritative record: CVE-2026-23399 at cve.org

Vendors: linux

Weaknesses: CWE-401

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-23399 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.