CVE-2026-80977

net: skbuff: don't touch shared zerocopy state in skb_tx_error()

State: Published
Severity: 7.8 High
Published: Sep 11, 2026
Updated: Oct 19, 2026
Reserved: Aug 26, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 6493165034bca14033bf49c9cec7b45e97a91497Affected 25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before b4452349dcf4d561e13be768d5d278de58248930Affected 25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 363c4252ffc473a0203e91b83ede5519dfb8bd07Affected 25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 6ec22afc82a3cae07ade0a6ec361ae2532128ff5Affected 25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 15aa81b390d401abf4b8211042470e9e92e3b7fbAffected 25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 288f9970670841044ab030104fa6b6ed159949d0Affected 25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 0370da114a9bc044e248b85c6809d1b5e0c1f7f9Affected 25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before f66bdb1cc0fcd227a062378f8be0b5873aa5600aAffected
LinuxLinux	3.8Affected before 3.8Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.109 through 6.12.Not affected 6.18.50 through 6.18.Not affected 7.2.4 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 6493165034bca14033bf49c9cec7b45e97a91497Affected
25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before b4452349dcf4d561e13be768d5d278de58248930Affected
25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 363c4252ffc473a0203e91b83ede5519dfb8bd07Affected
25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 6ec22afc82a3cae07ade0a6ec361ae2532128ff5Affected
25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 15aa81b390d401abf4b8211042470e9e92e3b7fbAffected
25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 288f9970670841044ab030104fa6b6ed159949d0Affected
25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before 0370da114a9bc044e248b85c6809d1b5e0c1f7f9Affected
25121173f7b1e4ac3fc692df6e7b8c52ec36abba to before f66bdb1cc0fcd227a062378f8be0b5873aa5600aAffected

LinuxLinux

3.8Affected
before 3.8Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.109 through 6.12.*Not affected
6.18.50 through 6.18.*Not affected
7.2.4 through 7.2.*Not affected
7.3 and laterNot affected

References

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