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CVE-2026-46323

HIGH 7.8

Published 2026-06-09 · Last modified 2026-06-30

In the Linux kernel, the following vulnerability has been resolved: net: gro: don't merge zcopy skbs skb_gro_receive() can currently copy frags between the source and GRO skb, without checking the zerocopy status, and in particular the SKBFL_MANAGED_FRAG_REFS flag. When SKBFL_MANAGED_FRAG_REFS is set, the skb doesn't hold a reference on the pages in shinfo->frags. Appending those frags to another skb's frags without fixing up the page refcount can lead to UAF. When either the last skb in the GRO chain (the one we would append frags to) or the source skb is zerocopy, don't merge the skbs.

ELEVATED IMPACT

Severe if exploited (CVSS 7.8), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.1%chance of exploitation in 30 days · 3rd percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

7.8CVSS 3.1 · HIGH

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Affected

Vendors Linux Red Hat

Products Linux Red Hat Enterprise Linux Appstream Eus (V. 10.0) Red Hat Enterprise Linux Appstream E4s (V.9.4) Red Hat Enterprise Linux Appstream Eus (V.9.6) Red Hat Enterprise Linux Baseos Eus (V. 10.0) Red Hat Enterprise Linux Baseos E4s (V.9.4) Red Hat Enterprise Linux Baseos Eus (V.9.6) Red Hat Enterprise Linux Codeready Linux Builder Eus (V. 10.0)

Weakness (CWE)

  • CWE-123

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS