CVE-2026-46323: net: gro: don't merge zcopy skbs

Affected versions

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

• linux linux kernel6.0 and later · before 6.1.176
• linux linux kernel6.2 and later · before 6.6.142
• linux linux kernel6.7 and later · before 6.12.92
• linux linux kernel6.13 and later · before 6.18.34
• linux linux kernel6.19 and later · before 7.0.11
• linux linux kernel7.1

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

  • 6.0affected
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc and later · before 3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8daffected · git
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc and later · before 1f9c828556416fbe3f49386708ce999fc4d4da06affected · git
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc and later · before 479084ae0e1d9cb7929cb4298d35623de189f80aaffected · git
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc and later · before e334cbf3388fd9334503a778a82d9e9f14dd2f71affected · git
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc and later · before 44bea2032af0425e4ce6d26a8af0ede79db49ec1affected · git
  • 753f1ca4e1e50248a1b760c9774d6d6b354562cc and later · before 4db79a322db8c97f7b73b8a347395ef4d685eb40affected · git
  • before 6.0not affected · semver
  • 6.1.176 and later · up to and including 6.1.*not affected · semver
  • 6.6.142 and later · up to and including 6.6.*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-2026-46321Jun 9, 2026 · tun: free page on short-frame rejection in tun_xdp_one()
  28Monitor
• ← EarlierCVE-2026-46322Jun 9, 2026 · tun: free page on build_skb failure in tun_xdp_one()
  28Monitor
• Later →CVE-2026-46324Jun 9, 2026 · netfilter: nf_tables: use list_del_rcu for netlink hooks
  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.