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CVE-2026-46323

net: gro: don't merge zcopy skbs

Published: Jun 9, 2026Updated: Jun 19, 2026 Sources: CVE List NVD
NVD MITRE
7.8CVSSHIGH
EPSS Score
0.1%
Top 97.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Affected Products

LinuxLinux
On-premOS
Operating Systems / linux-distro
linuxoss-projectOperating Systemsaka the linux kernel

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://git.kernel.org/stable/c/1f9c828556416fbe3f49386708ce999fc4d4da06
git.kernel.org
https://git.kernel.org/stable/c/3c6cc9f2ca65b6dd61b1af75452dc0e1cd0aad8d
git.kernel.org
https://git.kernel.org/stable/c/44bea2032af0425e4ce6d26a8af0ede79db49ec1
git.kernel.org
and 3 more references View all →

Timeline

Published
Jun 9, 2026
Last Updated
Jun 19, 2026

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