CVE-2026-80977

CVE Enrichment

CVSS: 7.8 HIGH
EPSS: 0.13%
EPSS Percentile: 2.53%
CISA KEV: Not listed

Description

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't touch shared zerocopy state in skb_tx_error() skb_tx_error() completes the zerocopy uarg and clears SKBFL_ALL_ZEROCOPY, and skb_zcopy_downgrade_managed() clears SKBFL_MANAGED_FRAG_REFS. Both live in skb_shinfo(), which every clone shares, while the caller only owns the reference it is about to drop. Through a clone it tells the producer its pages are free and drops SKBFL_SHARED_FRAG for an skb that is still in flight. Open vSwitch reaches this with a non-last OVS_ACTION_ATTR_RECIRC: clone_execute() sends a skb_clone() into ovs_dp_process_packet() while do_execute_actions() keeps forwarding the original, and skb_clone() does not privatise the frags here -- skb_orphan_frags() returns early on SKBFL_DONT_ORPHAN. A flow miss on the clone then strips the marker from the packet still being forwarded, and a later local ESP delivery decrypts in place over frags it does not own privately. Skip it for a cloned skb. Nothing is lost: skb_release_data() clears the zerocopy state once the last reference to the shared data goes.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published: 12-Sep-2026 03:19
Last Modified: 19-Oct-2026 16:17
EPSS Date: 2026-10-25

CVSS Vector


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

References

Last enrichment sync: 26-Oct-2026 01:10
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

An error-handling helper: CVE-2026-80977 Sysdig details six Linux flaws, including public root exploit for ZDI-CAN-33367

CVE (6)

People (4)

MITRE ATT&CK (2)

Vendors (3)

Products (9)

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